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Exact instanton transseries for quantum mechanics SciPost Phys. (IF 5.5) Pub Date : 2024-04-12 Alexander van Spaendonck, Marcel Vonk
We calculate the instanton corrections to energy spectra of one-dimensional quantum mechanical oscillators to all orders and unify them in a closed form transseries description. Using alien calculus, we clarify the resurgent structure of these transseries and demonstrate two approaches in which the Stokes constants can be derived. As a result, we formulate a minimal one-parameter transseries for the
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Discounted Mean-Field Game model of a dense static crowd with variable information crossed by an intruder SciPost Phys. (IF 5.5) Pub Date : 2024-04-12 Matteo Butano, Cécile Appert-Rolland, Denis Ullmo
It was demonstrated in [Bonnemain et al., Phys. Rev. E 107, 024612 (2023)] that the anticipation pattern displayed by a dense crowd crossed by an intruder can be successfully described by a minimal Mean-Field Games model. However, experiments show that changes in the pedestrian knowledge significantly modify the dynamics of the crowd. Here, we show that the addition of a single parameter, the discount
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Free fermions beyond Jordan and Wigner SciPost Phys. (IF 5.5) Pub Date : 2024-04-10 Paul Fendley, Balázs Pozsgay
The Jordan-Wigner transformation is frequently utilised to rewrite quantum spin chains in terms of fermionic operators. When the resulting Hamiltonian is bilinear in these fermions, i.e. the fermions are free, the exact spectrum follows from the eigenvalues of a matrix whose size grows only linearly with the volume of the system. However, several Hamiltonians that do not admit a Jordan-Wigner transformation
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Design constraints for Unruh-DeWitt quantum computers SciPost Phys. (IF 5.5) Pub Date : 2024-04-10 Eric W. Aspling, John A. Marohn, Michael J. Lawler
The Unruh-DeWitt particle detector model has found success in demonstrating quantum information channels with non-zero channel capacity between qubits and quantum fields. These detector models provide the necessary framework for experimentally realizable Unruh-DeWitt quantum computers with near-perfect channel capacity. We propose spin-qubits with gate-controlled coupling to Luttinger liquids as a
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Global LHC constraints on electroweak-inos with SModelS v2.3 SciPost Phys. (IF 5.5) Pub Date : 2024-04-10 Mohammad Mahdi Altakach, Sabine Kraml, Andre Lessa, Sahana Narasimha, Timothée Pascal, Théo Reymermier, Wolfgang Waltenberger
Electroweak-inos, superpartners of the electroweak gauge and Higgs bosons, play a special role in supersymmetric theories. Their intricate mixing into chargino and neutralino mass eigenstates leads to a rich phenomenology, which makes it difficult to derive generic limits from LHC data. In this paper, we present a global analysis of LHC constraints for promptly decaying electroweak-inos in the context
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Crossed product algebras and generalized entropy for subregions SciPost Phys. (IF 5.5) Pub Date : 2024-04-10 Shadi Ali Ahmad, Ro Jefferson
An early result of algebraic quantum field theory is that the algebra of any subregion in a QFT is a von Neumann factor of type III$_{1}$, in which entropy cannot be well-defined because such algebras do not admit a trace or density states. However, associated to the algebra is a modular group of automorphisms characterizing the local dynamics of degrees of freedom in the region, and the crossed product
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Lieb-Schultz-Mattis anomalies as obstructions to gauging (non-on-site) symmetries SciPost Phys. (IF 5.5) Pub Date : 2024-04-09 Sahand Seifnashri
We study 't Hooft anomalies of global symmetries in 1+1d lattice Hamiltonian systems. We consider anomalies in internal and lattice translation symmetries. We derive a microscopic formula for the "anomaly cocycle" using topological defects implementing twisted boundary conditions. The anomaly takes value in the cohomology group $H^3(G,U(1)) × H^2(G,U(1))$. The first factor captures the anomaly in the
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Symmetries and anomalies of Kitaev spin-S models: Identifying symmetry-enforced exotic quantum matter SciPost Phys. (IF 5.5) Pub Date : 2024-04-09 Ruizhi Liu, Ho Tat Lam, Han Ma, Liujun Zou
We analyze the internal symmetries and their anomalies in the Kitaev spin-$S$ models. Importantly, these models have a lattice version of a $\mathbb{Z}_2$ 1-form symmetry, denoted by $\mathbb{Z}_2^{[1]}$. There is also an ordinary 0-form $\mathbb{Z}_2^{(x)}×\mathbb{Z}_2^{(y)}×\mathbb{Z}_2^T$ symmetry, where $\mathbb{Z}_2^{(x)}×\mathbb{Z}_2^{(y)}$ are $\pi$ spin rotations around two orthogonal axes
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On correlation functions for the open XXZ chain with non-longitudinal boundary fields: The case with a constraint SciPost Phys. (IF 5.5) Pub Date : 2024-04-09 Giuliano Niccoli, Véronique Terras
This paper is a continuation of [J. Phys. A: Math. Theor. 55, 405203 (2022)], in which a set of matrix elements of local operators was computed for the XXZ spin-1/2 open chain with a particular case of unparallel boundary fields. Here, we extend these results to the more general case in which both fields are non-longitudinal and related by one constraint, allowing for a partial description of the spectrum
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Hidden symmetry of Bogoliubov de Gennes quasi-particle eigenstates and universal relations in flat band superconducting bipartite lattices SciPost Phys. (IF 5.5) Pub Date : 2024-04-09 Georges Bouzerar, Maxime Thumin
Unconventional flat band (FB) superconductivity, as observed in van der Waals heterostructures, could open promising avenues towards high-T$_c$ materials. In FBs, pairings and superfluid weight scale linearly with the interaction parameter, such an unusual behaviour justifies and encourages strategies to promote FB engineering. Bipartite lattices (BLs) which naturally host FBs could be particularly
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"The Greatest and Most Important Human Right": Citizenship and Bureaucratic Indifference in Refugee-UNHCR Correspondence SciPost Phys. (IF 5.5) Pub Date : 2024-04-08 Lamis Abdelaaty
This article examines how refugees advocate for themselves with the UN Refugee Agency (UNHCR), and what responses their communications engender. It analyzes letters sent by refugees in Kenya to UNHCR headquarters in Geneva between 1983 and 1994. The findings underline a disjuncture between refugees’ efforts to constitute themselves as political agents, and UNHCR’s insistence on viewing them as depoliticized
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Mechanically-driven stem cell separation in tissues caused by proliferating daughter cells SciPost Phys. (IF 5.5) Pub Date : 2024-04-08 Johannes C. Krämer, Edouard Hannezo, Gerhard Gompper, Jens Elgeti
The homeostasis of epithelial tissue relies on a balance between the self-renewal of stem cell populations, cellular differentiation, and loss. Although this balance needs to be tightly regulated to avoid pathologies, such as tumor growth, the regulatory mechanisms, both cell-intrinsic and collective, which ensure tissue steady-state are still poorly understood. Here, we develop a computational model
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Thermalization of long range Ising model in different dynamical regimes: A full counting statistics approach SciPost Phys. (IF 5.5) Pub Date : 2024-04-05 Nishan Ranabhat, Mario Collura
We study the thermalization of the transverse field Ising chain with a power law decaying interaction $\sim 1/r^{\alpha}$ following a global quantum quench of the transverse field in two different dynamical regimes. The thermalization behavior is quantified by comparing the full probability distribution function (PDF) of the evolving states with the corresponding thermal state given by the canonical
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Vertical and lateral manipulation of single Cs atoms on the semiconductor InAs(111)A SciPost Phys. (IF 5.5) Pub Date : 2024-04-05 Rian A. M. Ligthart, Cristophe Coinon, Ludovic Desplanque, Xavier Wallart, Ingmar Swart
The tip of the scanning tunneling microscope can be used to position atoms and molecules on surfaces with atomic scale precision. Here, we report the controlled vertical and lateral manipulation of single Cs atoms on the InAs(111)A surface. The Cs adatom adsorbs on the In-vacancy site of the InAs(111)A—(2x2) surface reconstruction. Lateral manipulation is possible in all directions over the surface
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Heat and charge transport in interacting nanoconductors driven by time-modulated temperatures SciPost Phys. (IF 5.5) Pub Date : 2024-04-05 Rosa López, Pascal Simon, Minchul Lee
We investigate the quantum transport of the heat and the charge through a quantum dot coupled to fermionic contacts under the influence of time modulation of temperatures. We derive, within the nonequilibrium Keldysh Green's function formalism, generic formulas for the charge and heat currents by extending the concept of gravitational field introduced by Luttinger to the dynamically driven system and
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Stochastic series expansion quantum Monte Carlo for Rydberg arrays SciPost Phys. (IF 5.5) Pub Date : 2024-04-05 Ejaaz Merali, Isaac J. S. De Vlugt, Roger G. Melko
Arrays of Rydberg atoms are a powerful platform to realize strongly-interacting quantum many-body systems. A common Rydberg Hamiltonian is free of the sign problem, meaning that its equilibrium properties are amenable to efficient simulation by quantum Monte Carlo (QMC). In this paper, we develop a Stochastic Series Expansion QMC algorithm for Rydberg atoms interacting on arbitrary lattices. We describe
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Speed of sound in dense strong-interaction matter SciPost Phys. (IF 5.5) Pub Date : 2024-04-05 Jens Braun, Andreas Geißel, Benedikt Schallmo
We study the speed of sound in strong-interaction matter at zero temperature and in density regimes which are expected to be governed by the presence of a color-superconducting gap. At (very) high densities, our analysis indicates that the speed of sound approaches its asymptotic value associated with the non-interacting quark gas from below, in agreement with first-principles studies which do not
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Inferring effective couplings with restricted Boltzmann machines SciPost Phys. (IF 5.5) Pub Date : 2024-04-05 Aurélien Decelle, Cyril Furtlehner, Alfonso de Jesús Navas Gómez, Beatriz Seoane
Generative models offer a direct way of modeling complex data. Energy-based models attempt to encode the statistical correlations observed in the data at the level of the Boltzmann weight associated with an energy function in the form of a neural network. We address here the challenge of understanding the physical interpretation of such models. In this study, we propose a simple solution by implementing
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Generalized charges, part I: Invertible symmetries and higher representations SciPost Phys. (IF 5.5) Pub Date : 2024-04-04 Lakshya Bhardwaj, Sakura Schäfer-Nameki
$q$-charges describe the possible actions of a generalized symmetry on $q$-dimensional operators. In Part I of this series of papers, we describe $q$-charges for invertible symmetries; while the discussion of $q$-charges for non-invertible symmetries is the topic of Part II. We argue that $q$-charges of a standard global symmetry, also known as a 0-form symmetry, correspond to the so-called $(q+1)$-representations
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An overview of lattice results for parton distribution functions SciPost Phys. (IF 5.5) Pub Date : 2024-04-03 Luigi Del Debbio
Following a ground-breaking proposal by Ji [Phys. Rev. Lett. 110, 262002 (2013)], numerical simulations of Quantum Chromo Dynamics (QCD) on a Euclidean lattice have provided new, valuable information on the structure of hadrons. In this talk, we briefly review the lattice approach to the reconstruction of parton densities, highlighting the connection between lattice observables and parton densities
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Λ(1520) resonance production with respect to transverse spherocity using EPOS3+UrQMD SciPost Phys. (IF 5.5) Pub Date : 2024-04-03 Nasir Mehdi Malik, Sanjeev Singh Sambyal
Resonances are sensitive to the properties of the medium created in heavy ion collision. They also provide insight into the properties of the hadronic phase. Studying the dependence of the yield of resonances on transverse spherocity and multiplicity allows us to understand the resonance production mechanism with event topology and system size, respectively. The results reported pertain to $\Lambda(1520)$
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Multiplicity dependence of charged-particle jet production in pp collisions at 13 TeV with ALICE SciPost Phys. (IF 5.5) Pub Date : 2024-04-03 Debjani Banerjee
Measurements of jet production and jet properties in pp collisions provide a test of perturbative quantum chromodynamics (pQCD) and form a baseline for similar measurements in heavy ion (A-A) collisions. In this contribution, we report recent ALICE measurements of charged-particle jet production and intra-jet properties, including mean charged-constituent multiplicity and fragmentation distribution
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Muon measurements at the Pierre Auger Observatory SciPost Phys. (IF 5.5) Pub Date : 2024-04-03 Dariusz Góra
The Pierre Auger Observatory is the world's largest detector for observation of ultra-high-energy cosmic rays (UHECRs) (above the energy of $10^{17}$ eV). It consists of a Fluorescence Detector (FD) and an array of particle detectors known as the Surface Detector (SD). Observations of extensive air showers by the Observatory can be used to probe hadronic interactions at high energy, in a kinematic
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ATLAS results on exotic hadronic resonances SciPost Phys. (IF 5.5) Pub Date : 2024-04-02 Yue Xu
Recent results from the proton-proton collision data taken by the ATLAS experiment on exotic resonances are presented. A search for $J/\psi p$ resonances in $\Lambda_{b}→ J/\psi p K$ decays with large $p K$ invariant masses is reported. A search for exotic resonances in the four-muon final state is shown.
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The role of the underlying event in the charm-baryon enhancement observed in pp collisions at LHC energies SciPost Phys. (IF 5.5) Pub Date : 2024-04-02 Zoltán Varga, Anett Misák, Róbert Vértesi
We study the enhanced production of $\Lambda_c$ charmed baryons relative to that of charmed $D^0$ mesons in proton–proton collisions at LHC energies. We simulated collision events with the enhanced color-reconnection model in PYTHIA 8 MC generator and propose measurements based on the comparative use of different event-activity classifiers to identify the source of the charmed-baryon enhancement. We
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Amplitude and colour evolution SciPost Phys. (IF 5.5) Pub Date : 2024-04-02 Simon Plätzer
Colour evolution and parton branching at the amplitude level have become important theoretical frameworks to improve parton showers, and are algorithms in their own right: They complement shower development by resummation algorithms capable of including interference effects and subleading colour contributions at an unprecedented level. I summarize recent development in the field, focusing on soft gluon
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Towards the computation of inclusive decay rates using lattice QCD SciPost Phys. (IF 5.5) Pub Date : 2024-04-02 Paolo Gambino, Shoji Hashimoto, Sandro Mächler, Marco Panero, Francesco Sanfilippo, Silvano Simula, Antonio Smecca, Nazario Tantalo
We present a non-perturbative computation of inclusive rates of semileptonic decays of heavy mesons from lattice QCD simulations. The calculation is based on the extraction of smeared spectral functions obtained from four-point Euclidean correlation functions computed on configuration ensembles of the JLQCD and ETM collaborations. We compare our results for the inclusive decay rates with analytical
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Sub-TeV hadronic interaction model differences and their impact on air showers SciPost Phys. (IF 5.5) Pub Date : 2024-04-02 Michael Schmelling, Álvaro Pastor-Gutiérrez, Harm Schorlemmer, Robert Daniel Parsons
In the sub-TeV regime, the most widely used hadronic interaction models disagree significantly in their predictions of particle spectra from cosmic ray induced air showers. We investigate the nature and impact of model uncertainties, focussing on air shower primaries with energies around the transition between high and low energy hadronic interaction models, where the dissimilarities are largest and
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Can quantized fragmentation replace colour reconnection models? SciPost Phys. (IF 5.5) Pub Date : 2024-04-02 Šárka Todorova-Nová
A brief overview of properties of the model of quantized fragmentation of a helical QCD string is followed by the discussion of colour reconnection models and of the ways to reproduce the evolution of the average transverse momentum in hadronic events, as function of charged particle multiplicity. Reference to recent experimental data is included.
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A coupling prescription for post-Newtonian corrections in quantum mechanics SciPost Phys. (IF 5.5) Pub Date : 2024-03-27 Jelle Hartong, Emil Have, Niels Obers, Igor Pikovski
The interplay between quantum theory and general relativity remains one of the main challenges of modern physics. A renewed interest in the low-energy limit is driven by the prospect of new experiments that could probe this interface. Here we develop a covariant framework for expressing post-Newtonian corrections to Schrödinger's equation on arbitrary gravitational backgrounds based on a $1/c^2$ expansion
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Beyond braid statistics: Constructing a lattice model for anyons with exchange statistics intrinsic to one dimension SciPost Phys. (IF 5.5) Pub Date : 2024-03-26 Sebastian Nagies, Botao Wang, Adam C. Knapp, André Eckardt, Nathan L. Harshman
Anyons obeying fractional exchange statistics arise naturally in two dimensions: Hard-core two-body constraints make the configuration space of particles not simply-connected. The braid group describes how topologically-inequivalent exchange paths can be associated to non-trivial geometric phases for abelian anyons. Braid-anyon exchange statistics can also be found in one dimension (1D), but this requires
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Abelian combinatorial gauge symmetry SciPost Phys. (IF 5.5) Pub Date : 2024-03-26 Hongji Yu, Dmitry Green, Andrei E. Ruckenstein, Claudio Chamon
Combinatorial gauge symmetry is a principle that allows us to construct lattice gauge theories with two key and distinguishing properties: a) only one- and two-body interactions are needed; and b) the symmetry is exact rather than emergent in an effective or perturbative limit. The ground state exhibits topological order for a range of parameters. This paper is a generalization of the construction
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Anomalies of generalized symmetries from solitonic defects SciPost Phys. (IF 5.5) Pub Date : 2024-03-26 Lakshya Bhardwaj, Mathew Bullimore, Andrea E. V. Ferrari, Sakura Schäfer-Nameki
We propose the general idea that 't Hooft anomalies of generalized global symmetries can be understood in terms of the properties of solitonic defects, which generically are non-topological defects. The defining property of such defects is that they act as sources for background fields of generalized symmetries. 't Hooft anomalies arise when solitonic defects are charged under these generalized symmetries
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Quantum parameter estimation with many-body fermionic systems and application to the Hall effect SciPost Phys. (IF 5.5) Pub Date : 2024-03-25 Olivier Giraud, Mark-Oliver Goerbig, Daniel Braun
We calculate the quantum Fisher information for a generic many-body fermionic system in a pure state depending on a parameter. We discuss the situations where the parameter is imprinted in the basis states, in the state coefficients, or both. In the case where the parameter dependence of coefficients results from a Hamiltonian evolution, we derive a particularly simple expression for the quantum Fisher
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Anomalous Luttinger equivalence between temperature and curved spacetime: From black holes to thermal quenches SciPost Phys. (IF 5.5) Pub Date : 2024-03-25 Baptiste Bermond, Maxim Nikolaevich Chernodub, Adolfo G. Grushin, David Carpentier
Building on the idea of Tolman and Ehrenfest that heat has weight, Luttinger established a deep connection between gravitational fields and thermal transport. However, this relation does not include anomalous quantum fluctuations that become paramount in strongly curved spacetime. In this work, we revisit the celebrated Tolman-Ehrenfest and Luttinger relations and show how to incorporate the quantum
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Variational quantum gate optimization at the pulse level SciPost Phys. (IF 5.5) Pub Date : 2024-03-22 Sean Greenaway, Francesco Petiziol, Zhao Hongzheng, Florian Mintert
We experimentally investigate the viability of a variational quantum gate optimization protocol informed by the underlying physical Hamiltonian of fixed-frequency transmon qubits. Through the successful experimental optimization of two and three qubit quantum gates the utility of the scheme for obtaining gates based on static effective Hamiltonians is demonstrated. The limits of such a strategy are
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Thouless pumping in Josephson junction arrays SciPost Phys. (IF 5.5) Pub Date : 2024-03-22 Stavros Athanasiou, Ida Egholm Nielsen, Matteo M. Wauters, Michele Burrello
Recent advancements in fabrication techniques have enabled unprecedented clean interfaces and gate tunability in semiconductor-superconductor heterostructures. Inspired by these developments, we propose protocols to realize Thouless quantum pumping in electrically tunable Josephson junction arrays. We analyze, in particular, the implementation of the Rice-Mele and the Harper-Hofstadter pumping schemes
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Generalized symmetries and anomalies of 3d $\mathcal{N}=4$ SCFTs SciPost Phys. (IF 5.5) Pub Date : 2024-03-20 Lakshya Bhardwaj, Mathew Bullimore, Andrea E. V. Ferrari, Sakura Schäfer-Nameki
We study generalized global symmetries and their 't Hooft anomalies in 3d $\mathcal{N}=4$ superconformal field theories (SCFTs). Following some general considerations, we focus on good quiver gauge theories, comprised of balanced unitary nodes and unbalanced unitary and special unitary nodes. While the global form of the Higgs branch symmetry group may be determined from the UV Lagrangian, the global
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Exploring kinetically induced bound states in triangular lattices with ultracold atoms: Spectroscopic approach SciPost Phys. (IF 5.5) Pub Date : 2024-03-20 Ivan Morera Navarro, Christof Weitenberg, Klaus Sengstock, Eugene Demler
Quantum simulations with ultracold fermions in triangular optical lattices have recently emerged as a new platform for studying magnetism in frustrated systems. Experimental realizations of the Fermi Hubbard model revealed striking contrast between magnetism in bipartite and triangular lattices. In bipartite lattices magnetism is strongest at half filling, and doped charge carriers tend to suppress
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The partial Bondi gauge: Gauge fixings and asymptotic charges SciPost Phys. (IF 5.5) Pub Date : 2024-03-18 Marc Geiller, Céline Zwikel
In the companion paper [SciPost Phys. 13, 108 (2022)] we have studied the solution space at null infinity for gravity in the partial Bondi gauge. This partial gauge enables to recover as particular cases and among other choices the Bondi-Sachs and Newman-Unti gauges, and to approach the question of the most general boundary conditions and asymptotic charges in gravity. Here we compute and study the
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The Floquet Baxterisation SciPost Phys. (IF 5.5) Pub Date : 2024-03-18 Yuan Miao, Vladimir Gritsev, Denis V. Kurlov
Quantum integrability has proven to be a useful tool to study quantum many-body systems out of equilibrium. In this paper we construct a generic framework for integrable quantum circuits through the procedure of Floquet Baxterisation. The integrability is guaranteed by establishing a connection between Floquet evolution operators and inhomogeneous transfer matrices obtained from the Yang-Baxter relations
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Faraday rotation and transmittance as markers of topological phase transitions in 2D materials SciPost Phys. (IF 5.5) Pub Date : 2024-03-18 Manuel Calixto, Alberto Mayorgas, Nicolás A. Cordero, Elvira Romera, Octavio Héctor Castaños Garza
We analyze the magneto-optical conductivity (and related magnitudes like transmittance and Faraday rotation of the irradiated polarized light) of some elemental two-dimensional Dirac materials of group IV (graphene analogues, buckled honeycomb lattices, like silicene, germanene, stannane, etc.), group V (phosphorene), and zincblende heterostructures (like HgTe/CdTe quantum wells) near the Dirac and
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Semiconductor electron-phonon equations: A rung above Boltzmann in the many-body ladder SciPost Phys. (IF 5.5) Pub Date : 2024-03-13 Gianluca Stefanucci, Enrico Perfetto
Starting from the ab initio many-body theory of electrons and phonons, we go through a series of well defined simplifications to derive a set of coupled equations of motion for the electronic occupations and polarizations, nuclear displacements as well as phononic occupations and coherences. These are the semiconductor electron-phonon equations (SEPE), sharing the same scaling with system size and
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Quantum droplets with particle imbalance in one-dimensional optical lattices SciPost Phys. (IF 5.5) Pub Date : 2024-03-13 Jofre Vallès-Muns, Ivan Morera, Grigori E. Astrakharchik, Bruno Juliá-Díaz
We study the formation of particle-imbalanced quantum droplets in a one-dimensional optical lattice containing a binary bosonic mixture at zero temperature. To understand the effects of the imbalance from both the few- and many-body perspectives, we employ density matrix renormalization group (DMRG) simulations and perform the extrapolation to the thermodynamic limit. In contrast to the particle-balanced
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Stochastic field dynamics in models of spontaneous unitarity violation SciPost Phys. (IF 5.5) Pub Date : 2024-03-13 Lotte Mertens, Matthijs Wesseling, Jasper van Wezel
Objective collapse theories propose a solution to the quantum measurement problem by predicting deviations from Schrödinger's equation that can be tested experimentally. A class of objective theories based on spontaneous unitarity violation was recently introduced, in which the stochastic field required for obtaining Born's rule does not depend on the state of the system being measured. Here, we classify
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EFT matching from analyticity and unitarity SciPost Phys. (IF 5.5) Pub Date : 2024-03-12 Stefano De Angelis, Gauthier Durieux
We present a new on-shell method for the matching of ultraviolet models featuring massive states onto their massless effective field theory. We employ a dispersion relation in the space of complex momentum dilations to capture, in a single variable, the relevant analytic structure of scattering amplitudes at any multiplicity. Multivariate complex analysis and crossing considerations are therefore avoided
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Measurement induced transitions in non-Markovian free fermion ladders SciPost Phys. (IF 5.5) Pub Date : 2024-03-12 Mikheil Tsitsishvili, Dario Poletti, Marcello Dalmonte, Giuliano Chiriacò
Recently there has been an intense effort to understand measurement induced transitions, but we still lack a good understanding of non-Markovian effects on these phenomena. To that end, we consider two coupled chains of free fermions, one acting as the system of interest, and one as a bath. The bath chain is subject to Markovian measurements, resulting in an effective non-Markovian dissipative dynamics
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Probing muon g-2 at a future muon collider SciPost Phys. (IF 5.5) Pub Date : 2024-03-12 Jason Arakawa, Arvind Rajaraman, Taotao Sui, Tim M. P. Tait
The $4.2\sigma$ discrepancy in the $(g-2)$ of the muon provides a hint that may indicate that physics beyond the standard model is at play. A multi-TeV scale muon collider provides a natural testing ground for this physics. In this paper, we discuss the potential to probe the BSM parameter space that is consistent with solving the $(g-2)_{\mu}$ discrepancy in the language of the SMEFT, utilizing the
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Entanglement-enabled symmetry-breaking orders SciPost Phys. (IF 5.5) Pub Date : 2024-03-11 Cheng-Ju Lin, Liujun Zou
A spontaneous symmetry-breaking order is conventionally described by a tensor-product wavefunction of some few-body clusters; some standard examples include the simplest ferromagnets and valence bond solids. We discuss a type of symmetry-breaking orders, dubbed entanglement-enabled symmetry-breaking orders, which cannot be realized by any such tensor-product state. Given a symmetry breaking pattern
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The functional generalization of the Boltzmann-Vlasov equation and its gauge-like symmetry SciPost Phys. (IF 5.5) Pub Date : 2024-03-11 Giorgio Torrieri
We argue that one can model deviations from the ensemble average in non-equilibrium statistical mechanics by promoting the Boltzmann equation to an equation in terms of functionals , representing possible candidates for phase space distributions inferred from a finite observed number of degrees of freedom. We find that, provided the collision term and the Vlasov drift term are both included, a gauge-like
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Topologically stable ergodicity breaking from emergent higher-form symmetries in generalized quantum loop models SciPost Phys. (IF 5.5) Pub Date : 2024-03-08 Charles Stahl, Rahul Nandkishore, Oliver Hart
We present a set of generalized quantum loop models that provably exhibit topologically stable ergodicity breaking. These results hold for both periodic and open boundary conditions, and derive from a one-form symmetry (notably not being restricted to sectors of extremal one-form charge). We identify simple models in which this one-form symmetry can be emergent, giving rise to the aforementioned ergodicity
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An exact method for bosonizing the Fermi surface in arbitrary dimensions SciPost Phys. (IF 5.5) Pub Date : 2024-03-08 Takamori Park, Leon Balents
Inspired by the recent work by Delacretaz et. al. [Phys. Rev. Res. 4, 033131 (2022)], we rigorously derive an exact and simple method to bosonize a non-interacting fermionic system with a Fermi surface starting from a microscopic Hamiltonian. In the long-wavelength limit, we show that the derived bosonized action is exactly equivalent to the action obtained by Delacretaz et. al. In addition, we propose
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Tunnelling to holographic traversable wormholes SciPost Phys. (IF 5.5) Pub Date : 2024-03-05 Suzanne Bintanja, Ben Freivogel, Andrew Rolph
We study nonperturbative effects of quantum gravity in a system consisting of a coupled pair of holographic CFTs. The AdS$_4$/CFT$_3$ system has three possible ground states: two copies of empty AdS, a pair of extremal AdS black holes, and an eternal AdS traversable wormhole. We give a recipe for calculating transition rates via gravitational instantons and test it by calculating the emission rate
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Codebase release r1.4 for CoVVVR SciPost Phys. (IF 5.5) Pub Date : 2024-03-04 Prasanth Shyamsundar, Jacob L. Scott, Stephen Mrenna, Konstantin T. Matchev, Kyoungchul Kong
Monte Carlo (MC) integration is an important calculational technique in the physical sciences. Practical considerations require that the calculations are performed as accurately as possible for a given set of computational resources. To improve the accuracy of MC integration, a number of useful variance reduction algorithms have been developed, including importance sampling and control variates. In
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High-dimensional and permutation invariant anomaly detection SciPost Phys. (IF 5.5) Pub Date : 2024-02-29 Vinicius Mikuni, Benjamin Nachman
Methods for anomaly detection of new physics processes are often limited to low-dimensional spaces due to the difficulty of learning high-dimensional probability densities. Particularly at the constituent level, incorporating desirable properties such as permutation invariance and variable-length inputs becomes difficult within popular density estimation methods. In this work, we introduce a permutation-invariant
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Certifying quantum separability with adaptive polytopes SciPost Phys. (IF 5.5) Pub Date : 2024-03-01 Ties-Albrecht Ohst, Xiao-Dong Yu, Otfried Gühne, Chau H. Nguyen
The concept of entanglement and separability of quantum states is relevant for several fields in physics. Still, there is a lack of effective operational methods to characterise these features. We propose a method to certify quantum separability of two- and multiparticle quantum systems based on an adaptive polytope approximation. This leads to an algorithm which, for practical purposes, conclusively
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Majorana chain and Ising model - (non-invertible) translations, anomalies, and emanant symmetries SciPost Phys. (IF 5.5) Pub Date : 2024-03-01 Nathan Seiberg, Shu-Heng Shao
We study the symmetries of closed Majorana chains in 1+1d, including the translation, fermion parity, spatial parity, and time-reversal symmetries. The algebra of the symmetry operators is realized projectively on the Hilbert space, signaling anomalies on the lattice, and constraining the long-distance behavior. In the special case of the free Hamiltonian (and small deformations thereof), the continuum
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Reduce, reuse, reinterpret: An end-to-end pipeline for recycling particle physics results SciPost Phys. (IF 5.5) Pub Date : 2024-02-28 Giordon Stark, Camila Aristimuno Ots, Mike Hance
Searches for new physics at the Large Hadron Collider have constrained many models of physics beyond the Standard Model. Many searches also provide resources that allow them to be reinterpreted in the context of other models. We describe a reinterpretation pipeline that examines previously untested models of new physics using supplementary information from ATLAS Supersymmetry (SUSY) searches in a way
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Boundary signature of singularity in the presence of a shock wave SciPost Phys. (IF 5.5) Pub Date : 2024-02-28 Gary T. Horowitz, Henry Leung, Leonel Queimada, Ying Zhao
Matter falling into a Schwarzschild-AdS black hole from the left causes increased focussing of ingoing geodesics from the right, and, as a consequence, they reach the singularity sooner. In a standard Penrose diagram, the singularity "bends down". We show how to detect this feature of the singularity holographically, using a boundary two-point function. We model the matter with a shock wave, and show
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Solvable models for 2+1D quantum critical points: Loop soups of 1+1D conformal field theories SciPost Phys. (IF 5.5) Pub Date : 2024-02-28 Amin Moharramipour, Dan Sehayek, Thomas Scaffidi
We construct a class of solvable models for 2+1D quantum critical points by attaching 1+1D conformal field theories (CFTs) to fluctuating domain walls forming a "loop soup". Specifically, our local Hamiltonian attaches gapless spin chains to the domain walls of a triangular lattice Ising antiferromagnet. The macroscopic degeneracy between antiferromagnetic configurations is split by the Casimir energy