Article
Astronomy & Astrophysics
R. Bufalo, T. Cardoso e Bufalo
Summary: The paper discusses vacuum Cherenkov radiation in z = 2 Lifshitz electrodynamics, highlighting the importance of improved ultraviolet behavior and renormalizable couplings due to time-space anisotropic scaling. The study evaluates the instantaneous rate of energy loss for a charge and analyzes the emission of very soft photons in this framework.
Article
Astronomy & Astrophysics
F. C. E. Lima, A. Yu Petrov, C. A. S. Almeida
Summary: We developed a perturbative generation approach for scalar-vector theories to investigate possible topological vortex structures in generalized models, demonstrating the necessity of nonpolynomial dielectric permeability functions such as the logarithmic function. By constructing models with logarithmic dielectric permeability in (2 + 1)D, we explored the presence of topological vortex structures in a Maxwell model.
Article
Multidisciplinary Sciences
Christian Schaefer, Florian Buchholz, Markus Penz, Michael Ruggenthaler, Angel Rubio
Summary: This work presents a nonperturbative formulation of quantum electrodynamics in the long-wavelength limit without considering photons, providing an accurate starting point for ab initio methods with the potential to increase accuracy. The formulation takes into account the quantized nature of light while remaining computationally simple enough for a wide range of applications.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2021)
Article
Multidisciplinary Sciences
Rosario R. Riso, Tor S. Haugland, Enrico Ronca, Henrik Koch
Summary: The authors introduce a fully consistent ab-initio method of molecular orbital theory applicable to material systems in quantum electrodynamics environments. The method can be used to predict and explain modifications of molecular properties due to cavity induced effects.
NATURE COMMUNICATIONS
(2022)
Article
Optics
Niclas Westerberg, Anette Messinger, Stephen M. Barnett
Summary: This article discusses the form of magnetic interaction energy and its impact on atom-light properties. It proposes restoring the symmetry of Maxwell's equations through the inclusion of general local-field effects and emphasizes the necessity of correctly translating between the macroscopic and microscopic worlds, as well as its influence on the form of dipole forces in a medium.
Article
Physics, Multidisciplinary
Fan Yang, Mads M. Lund, Thomas Pohl, Peter Lodahl, Klaus Molmer
Summary: Researchers have presented a method to classify quantum fields by using a pair of two-level emitters coupled to a waveguide, which can scatter the single and two-photon components of an input pulse into orthogonal temporal modes. The method achieves a high fidelity and can be used to construct logic elements.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Multidisciplinary
Rocio Saez-Blazquez, Daniele de Bernardis, Johannes Feist, Peter Rabl
Summary: This study addresses the possibility of generating nonperturbative corrections to the ground state of a dipole by coupling it to a strongly confined electromagnetic vacuum. Two simplified cavity QED setups are considered, providing analytic expressions for the total ground-state energy and distinguishing between electrostatic and vacuum-induced contributions. The findings suggest that the presence of high-impedance modes can significantly increase the vacuum-induced effects, opening up the possibility of nonperturbative light-matter interactions.
PHYSICAL REVIEW LETTERS
(2023)
Article
Physics, Multidisciplinary
Juan Roman-Roche, Fernando Luis, David Zueco
Summary: A system of magnetic molecules coupled to microwave cavities undergoes the equilibrium superradiant phase transition, which is experimentally observable. The coupling effect is illustrated by the vacuum-induced ferromagnetic order in a quantum Ising model and the modification of the magnetic phase diagram of Fe-8 dipolar crystals, showcasing the cooperation between intrinsic and photon-induced spin-spin interactions. Finally, a transmission experiment demonstrates the quantum electrodynamical control of magnetism in resolving the transition.
PHYSICAL REVIEW LETTERS
(2021)
Article
Chemistry, Physical
Nimrod Moiseyev, Arie Landau
Summary: The study focuses on the interactions of chemical systems in a cavity and the ability to control reactions in the cavities, but there is still a significant gap between experiment and theory. The research aims to bridge this gap by analyzing solvable analytical models and realistic models for reactions within cavities. Different methods to control the strength of the molecule-cavity coupling term are investigated, allowing for better control of chemical reactions. The findings contribute to the development of computational methods for simulating molecular systems in polariton cavities and demonstrate the potential of achieving isomerization inside a cavity.
JOURNAL OF CHEMICAL THEORY AND COMPUTATION
(2023)
Article
Optics
David Castells-Graells, Daniel Malz, Cosimo C. Rusconi, J. Ignacio Cirac
Summary: This research investigates the possibility of observing typical features of conventional waveguide quantum electrodynamics in a system where a one-dimensional subwavelength atomic array acts as the waveguide. By using antisymmetric states of atomic dimers as emitters, the effects of free-space spontaneous emission are significantly reduced. The study reveals non-Markovian corrections arising from the finiteness of the array and retardation effects, in addition to well-known phenomena of collective emission and long-range interactions between dimers mediated by the waveguide.
Article
Physics, Particles & Fields
T. Mariz, R. Martinez, J. R. Nascimento, A. Yu Petrov
Summary: This paper investigates the Lorentz-violating extended QED with nonminimal dimension-5 additive CPT-odd terms, focusing on the generation of CFJ term and its higher-derivative counterparts, demonstrating the vanishing of CFJ term in dimensional regularization and the elimination of higher-derivative divergent contributions by considering a given proportionality between coefficients.
EUROPEAN PHYSICAL JOURNAL C
(2021)
Article
Astronomy & Astrophysics
M. C. Araujo, J. Furtado, R. V. Maluf
Summary: In this study, we calculate the one-loop self-energy corrections to the gauge field in scalar electrodynamics modified by Lorentz-violating terms within the framework of the standard model extension (SME). We consider both CP T-even and CP T-odd contributions, and compute the radiative corrections using dimensional regularization. Finite temperature effects are taken into account using the Matsubara formalism.
Article
Astronomy & Astrophysics
Cheng Gong, Tao Zhu, Rui Niu, Qiang Wu, Jiang-Lei Cui, Xin Zhang, Wen Zhao, Anzhong Wan
Summary: This paper investigates the effects of high-order spatial derivatives on the propagation of gravitational waves due to Lorentz and parity violation. Bayesian inference is performed using modified waveforms and observational data from selected GW events to place lower bounds on the energy scales for Lorentz and parity violation. The results do not find significant evidence of Lorentz and parity violation at the fifth and sixth-order spatial derivatives terms.
Article
Quantum Science & Technology
Uesli Alushi, Tomas Ramos, Juan Jose Garcia-Ripoll, Roberto Di Candia, Simone Felicetti
Summary: The article investigates quadratic light-matter interactions in a waveguide QED system. The authors develop a general scattering theory and discuss paradigmatic examples, revealing fundamental differences with conventional waveguide QED systems.
Article
Optics
Benjamin Morris, Lukas J. Fiderer, Ben Lang, Daniel Goldwater
Summary: Bell's theorem rules out a classical understanding of nature by showing that no local hidden-variable model can explain the measurement statistics of a quantum system shared between two parties. This paper demonstrates that by relaxing the positivity restriction in the hidden-variable probability distribution, it is possible to derive quasiprobabilistic Bell inequalities whose upper bound is written in terms of a negativity witness of said distribution. It provides an analytic solution for the amount of negativity necessary to violate the Clauser-Horne-Shimony-Holt inequality, revealing the amount of negativity required to emulate the quantum statistics in a Bell test.
Article
Physics, Multidisciplinary
Javier Alvarez-Jimenez, Diego Gonzalez, Daniel Gutierrez-Ruiz, Jose David Vergara
ANNALEN DER PHYSIK
(2020)
Article
Physics, Nuclear
Carlos A. Margalli, J. David Vergara
INTERNATIONAL JOURNAL OF MODERN PHYSICS A
(2020)
Article
Physics, Multidisciplinary
Diego Gonzalez, Daniel Gutierrez-Ruiz, J. David Vergara
JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL
(2020)
Article
Astronomy & Astrophysics
Angel Garcia-Chung, Daniel Gutierrez-Ruiz, J. David Vergara
Summary: Dirac's formalism for constrained systems is applied to analyze time-dependent Hamiltonians in the extended phase space. This study shows that the Lewis invariant is reparametrization invariant, and calculates the Feynman propagator using the extended phase space description. By proposing a new canonical transformation within the extended phase space, a generalization of the Lewis invariant is obtained, along with potential applications.
Article
Multidisciplinary Sciences
Andres Gomez, Luis Urrutia
Summary: By using the path integral formulation in Euclidean space, the study extended the calculation of abelian chiral anomalies in Lorentz violating theories by introducing a new fermionic correction term provided by the standard model extension. The results showed that this anomaly is insensitive to the tilting parameter, retaining its covariant form, and the initially imposed gauge invariant regularization was recovered at the end of the calculation through complex covariant derivatives combinations.
Article
Astronomy & Astrophysics
Andres Gomez, A. Martin-Ruiz, Luis F. Urrutia
Summary: This study calculates the CPT odd contribution to the effective electromagnetic action arising from Lorentz invariance violation in a large class of fermionic systems using thermal field theory methods, focusing on corrections dependent on the chemical potential. The results are briefly applied to type-I tilted Weyl semimetals.
Article
Physics, Multidisciplinary
Joan A. Austrich-Olivares, Jose David Vergara
Summary: This paper introduces the concept of a quantum geometric tensor in a curved space with a parameter-dependent metric, which includes the quantum metric tensor and the corresponding Berry curvature. The parameter-dependent metric modifies the usual inner product, resulting in changes to the quantum metric tensor and Berry curvature by adding terms proportional to the derivatives of the metric determinant with respect to the parameters.
Article
Physics, Multidisciplinary
O. J. Franca, L. F. Urrutia
Summary: In this study, we investigate the radiation phenomenon in two semi-infinite magnetoelectric media with constant dielectric permittivity separated by a planar interface, and illustrate the effects of magnetoelectric coupling on the radiation through numerical estimations and hypothetical choices.
REVISTA MEXICANA DE FISICA
(2022)
Article
Physics, Multidisciplinary
Leonardo Medel, A. Martin-Ruiz, L. F. Urrutia
Summary: In this paper, the electromagnetic shielding of a bifilar transmission line in a layered cylinder is investigated, with the core and the shell made of conventional or topological insulators. The magnetoelectric response of the system is described by axion electrodynamics. The analytical solutions for the electromagnetic fields in the whole space as functions of materials parameters and shell thickness are obtained in the quasiestatic approximation.
EUROPEAN PHYSICAL JOURNAL PLUS
(2023)
Article
Physics, Multidisciplinary
Sergio B. Juarez, Diego Gonzalez, Daniel Gutierrez-Ruiz, J. David Vergara
Summary: The quantum geometric tensor, composed of the quantum metric tensor and Berry curvature, fully encodes the parameter space geometry of a physical system. We provide a formulation of the quantum geometric tensor in the path integral formalism that can handle both the ground and excited states, making it useful for studying excited state quantum phase transitions (ESQPT). We also generalize the quantum geometric tensor to incorporate variations of the system parameters and the phase-space coordinates, providing an alternative approach to the quantum covariance matrix and insights into the geometric properties of quantum systems.
Article
Materials Science, Multidisciplinary
Daniel Gutierrez-Ruiz, Jorge Chavez-Carlos, Diego Gonzalez, Jorge G. Hirsch, J. David Vergara
Summary: In this paper, we investigate the quantum metric tensor and its scalar curvature for the Dicke model. Using both analytical and numerical methods, we obtain the results for the quantum metric tensor and scalar curvature, and find a remarkable agreement between the numerical and analytical results in the quantum phase transition region. Additionally, we observe that the scalar curvature is continuous and approximately matches the numerical results in the thermodynamic limit.
Article
Optics
Bogar Diaz, Diego Gonzalez, Daniel Gutierrez-Ruiz, J. David Vergara
Summary: In this study, we derived the classical analog of the quantum covariance matrix through classical approximation and applied it to the anharmonic oscillator. Utilizing this classical covariance matrix, we introduced classical counterparts of purity, linear quantum entropy, and von Neumann entropy for classical integrable systems under the condition that their quantum counterparts are in Gaussian states. These classical analogs act as measures to quantify the remaining information from the complete system within the considered subsystem. By evaluating these classical analogs for various systems, like three coupled harmonic oscillators and two linearly coupled oscillators, we observed that they perfectly reproduced the results of their quantum counterparts. This highlights the remarkable ability to calculate these quantities from a classical perspective.
Article
Physics, Fluids & Plasmas
Diego Gonzalez, Daniel Gutierrez-Ruiz, J. David Vergara
Summary: In this study, the researchers investigated the classical analog of the quantum metric tensor and its scalar curvature for two well-known quantum physics models. They found that in the thermodynamic limit, the classical and quantum metrics have similar behaviors near the quantum phase transition, but the scalar curvatures show divergence only under certain conditions. Additionally, numerical analysis for finite sizes revealed precursors of the quantum phase transition in metric and scalar curvature, providing insight into their characterization as functions of parameters and system size.
Article
Materials Science, Multidisciplinary
Daniel Gutierrez-Ruiz, Diego Gonzalez, Jorge Chavez-Carlos, Jorge G. Hirsch, J. David Vergara
Summary: This study investigates the quantum metric tensor and scalar curvature of a specific version of the Lipkin-Meshkov-Glick model, analyzing ground-state and excited-state quantum phase transitions. By utilizing the Holstein-Primakoff approximation, analytic expressions for quantum metric tensor and curvatures were derived and compared with finite-size numerical results, showing good agreement except near phase transition points. The classical Hamiltonian was constructed using Bloch coherent states, revealing stability changes and bifurcation during quantum phase transitions.
Article
Physics, Multidisciplinary
Daniel G. Velazquez, L. F. Urrutia
Article
Astronomy & Astrophysics
Nelson R. F. Braga, Octavio C. Junqueira
Summary: This study investigates the influence of rotation on the transition temperature of strongly interacting matter produced in non-central heavy ion collisions. By using a holographic description of an AdS black hole, the authors extend the analysis to the more realistic case where the matter spreads over a region around the rotational axis. The results show the coexistence of confined and deconfined phases and are consistent with the concept of local temperature in rotating frames developed by Tolman and Ehrenfest.
Article
Astronomy & Astrophysics
Bing Sun, Jiachen An, Zhoujian Cao
Summary: This paper investigates the effect of gravitational constant variation on the propagation of gravitational waves. By employing two analytical methods, the study finds that variations in the gravitational constant result in amplitude and phase corrections for gravitational waves, and the time variation of the gravitational constant can be constrained through the propagation of gravitational waves.
Article
Astronomy & Astrophysics
Abdellah Touati, Zaim Slimane
Summary: This letter presents the first study of Hawking radiation as a tunneling process within the framework of non-commutative gauge theory of gravity. The non-commutative Schwarzschild black hole is reconstructed using the Seiberg-Witten map and the star product. The emission spectrum of outgoing massless particles is computed using the quantum tunneling mechanism. The results reveal pure thermal radiation in the low-frequency scenario, but a deviation from pure thermal radiation in the high-frequency scenario due to energy conservation. It is also found that noncommutativity enhances the correlations between successively emitted particles.
Article
Astronomy & Astrophysics
Shahar Hod
Summary: The travel times of light signals between two antipodal points on a compact star's surface are calculated for two different trajectories. It is shown that, for highly dense stars, the longer trajectory along the surface may have a shorter travel time as measured by asymptotic observers. A critical value of the dimensionless density-area parameter is determined for constant density stars to distinguish cases where crossing through the star's center or following a semi-circular trajectory on the surface has a shorter travel time as measured by asymptotic observers.
