Article
Physics, Particles & Fields
B. Eslam Panah, M. E. Rodrigues
Summary: In this paper, exact phantom (A)dS black hole solutions are obtained in the context of F(R) gravity with topological spacetime in four dimensions. The effects of different parameters on the event horizon are studied. The conserved and thermodynamic quantities of the system are calculated, and the first law of thermodynamics for these types of black holes is checked. The local stability of the topological phantom (A)dS black holes in F(R) gravity is evaluated by studying the heat capacity and the geometrothermodynamics, which show agreement. The global stability is investigated using the Gibbs potential and the Helmholtz free energy, and the effects of different parameters on local and global stabilities are highlighted.
EUROPEAN PHYSICAL JOURNAL C
(2023)
Article
Physics, Particles & Fields
Haximjan Abdusattar
Summary: In this work, we examine the stability and phase structure of AdS black holes with either a Maxwell field or a phantom field. We analyze the free energy and temperature of these systems in both the canonical and grand canonical ensembles. Our results reveal a phase transition in the grand canonical ensemble, similar to the Hawking-Page-like phase transition observed in AdS spacetime between thermal radiation and thermodynamically stable large black holes. We present graphical representations of these phase transitions on free energy-temperature diagrams for the black holes. Finally, we obtain the transition temperature, minimum temperature, and their dual relationships.
EUROPEAN PHYSICAL JOURNAL C
(2023)
Article
Physics, Particles & Fields
Haximjan Abdusattar
Summary: In this study, we investigate the thermodynamic stability and phase structure of AdS black holes and identify a phase transition in the grand canonical ensemble. Graphical representations of the phase transitions are presented on free energy-temperature diagrams for the black holes.
EUROPEAN PHYSICAL JOURNAL C
(2023)
Article
Astronomy & Astrophysics
Miguel Cruz, Samuel Lepe
Summary: This work focuses on the thermodynamics description of a phantom scenario proposed by the authors. The presence of negative chemical potential is necessary to maintain a consistent thermodynamics framework, as the cosmological model transitions from the phantom stage to a future de Sitter evolution. Previous works have also acknowledged the importance of negative chemical potential in resolving thermodynamic inconsistencies associated with phantom dark energy.
PHYSICS OF THE DARK UNIVERSE
(2023)
Article
Physics, Multidisciplinary
Michal P. Heller, Alexandre Serantes, Micha Spalinski, Benjamin Withers
Summary: We use causality to derive constraints on dispersion relations, which describe the location of singularities of retarded two-point functions in relativistic quantum field theories. We prove that all causal dissipative dispersion relations have a finite radius of convergence when stochastic fluctuations are negligible. Then, we provide two-sided bounds on all transport coefficients, including an upper bound on diffusivity, in units of this radius.
PHYSICAL REVIEW LETTERS
(2023)
Article
Physics, Multidisciplinary
Shunsuke Kamimura, Kyo Yoshida, Yasuhiro Tokura, Yuichiro Matsuzaki
Summary: In this study, new boundaries on the heat current in a quantum system coupled with an environment are derived and specific examples and restrictions are provided. These results are important for evaluating the performance of quantum-enhanced thermodynamic devices.
PHYSICAL REVIEW LETTERS
(2023)
Article
Physics, Particles & Fields
Shamaila Rani, Abdul Jawad, Mazhar Hussain
Summary: In this paper, the effect of Barrow entropy on the thermodynamic properties and geometry of specific black holes along with the nonlinear source is studied. The mass, temperature, thermodynamic variable, and electric potential of the black hole are investigated. Furthermore, the behavior of heat capacity is examined to check the stability of the black hole. Geometrothermodynamics allows for the description of interactions between thermodynamics, critical points, and phase transitions by considering the geometric characteristics of the thermodynamic equilibrium space. The analysis demonstrates consistency with the results derived from classical thermodynamics of black holes.
EUROPEAN PHYSICAL JOURNAL C
(2023)
Article
Physics, Multidisciplinary
J. Guemez, J. A. Mier
Summary: Two thermodynamic processes, including the launching of a projectile by forces produced by chemical reactions and the Joule-Kelvin process implemented on a conveyor belt, are analyzed using a relativistic four-vector fundamental equation formalism. The corresponding equations in different reference frames are obtained through Lorentz transformation, satisfying Einstein's principle of relativity. Non-mechanical energies are assigned linear momentum and their variations are considered in Newton's second law equation, taking into account relativistic non-simultaneity and conveyor belt effects. It is shown that entropy variations and fuel consumption are frame independent in relativistic thermodynamics.
Article
Astronomy & Astrophysics
F. Barzi, H. El Moumni
Summary: This study investigates the thermodynamic properties of the Hawking-Page phase transition of asymptotically-flat black holes in Renyi statistics. The research reveals evidence for the persistence of the universal formula associated with the Hawking-Page and minimum black hole thermodynamical transition points. It also explores the universal properties of black holes in different statistics beyond the Gibbs-Boltzmann formalism and suggests a potential connection between the nonextensivity Renyi parameter lambda and the cosmological constant A.
Article
Physics, Multidisciplinary
Faisal Javed, G. Mustafa, Ali Ovgun, M. Farasat Shamir
Summary: In this study, the wormhole solutions with the phantom regime in Rastall gravity are calculated using conformal symmetry, and the physical aspects of the self-gravitating system are explored. The shape function is determined by the equation of state, and all the energy conditions are checked. The structure of the traversable phantom wormhole is further investigated, considering different types of matter distribution and the influence of the Rastall parameter on the physical features of the shell.
EUROPEAN PHYSICAL JOURNAL PLUS
(2022)
Article
Physics, Particles & Fields
Yun-Zhi Du, Xiao-Yang Liu, Yang Zhang, Li Zhao, Qiang Gu
Summary: In this study, we investigate the Joule-Thomson expansion for the Einstein-Power-Yang-Mills AdS black holes in the context of the gauge-gravity duality, taking into account the nonlinearity of the Yang Mills charge. We calculate the Joule-Thomson coefficient, determine the cooling and heating regions by describing the relevant inversion and isenthalpic curves in the temperature-pressure plane. Finally, we analyze the impact of charge nonlinearity on the Joule-Thomson expansion.
EUROPEAN PHYSICAL JOURNAL C
(2023)
Article
Astronomy & Astrophysics
Suvankar Dutta, Taniya Mandal, Sanhita Parihar
Summary: The paper investigates the relativistic origin of the Rivlin-Ericksen fluid and finds it to be a subclass of a generalized nonrelativistic system. The study also reveals that three of the nonrelativistic second-order transports satisfy a universal constraint relation.
Article
Mathematics
Johannes Krah
Summary: We construct a non-full exceptional collection of maximal length consisting of line bundles on the blow-up of the projective plane in 10 general points. As a consequence, the orthogonal complement of this collection is a universal phantom category. This provides a counterexample to a conjecture of Kuznetsov and to a conjecture of Orlov.
INVENTIONES MATHEMATICAE
(2023)
Article
Physics, Fluids & Plasmas
Sushant Saryal, Bijay Kumar Agarwalla
Summary: In this study, precise statistics of heat and work for a class of working fluids in a quantum Otto engine driven quasistatically are provided, along with a universal expression relating the ratio of output work to input heat to the mean Otto efficiency. It is shown that for nonadiabatic driving of the engine with either a qubit or a harmonic oscillator as the working fluid, the relative fluctuation of output work is always greater than that of input heat, and the ratio between work and heat fluctuation has a lower bound in terms of the square of the average engine efficiency, which is saturated in the quasistatic limit.
Article
Multidisciplinary Sciences
Qian Zeng, Jin Wang
Summary: This study focuses on refining the concept of Maxwell's demon to explore the limit of energy dissipation in open systems, uncovering a previously unexplored set of fluctuation theorems. These theorems reveal the existence of an intrinsic nonequilibrium state in the system, guided by nonnegative demon-induced dissipative information. The analysis suggests that the bounds of both work and heat in the system are tighter than previously predicted, and proposes a potential experimental test to verify these boundaries.
Article
Astronomy & Astrophysics
J. F. Jesus, R. F. L. Holanda, S. H. Pereira
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2018)
Article
Physics, Particles & Fields
R. J. Bueno Rogerio, J. M. Hoff da Silva, M. Dias, S. H. Pereira
JOURNAL OF HIGH ENERGY PHYSICS
(2018)
Article
Astronomy & Astrophysics
S. H. Pereira, Richard S. Costa
MODERN PHYSICS LETTERS A
(2019)
Article
Physics, Particles & Fields
S. H. Pereira, M. E. S. Alves, T. M. Guimaraes
EUROPEAN PHYSICAL JOURNAL C
(2019)
Article
Astronomy & Astrophysics
R. F. L. Holanda, L. R. Colaco, S. H. Pereira, R. Silva
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2019)
Article
Physics, Particles & Fields
S. H. Pereira, R. de C. Lima, J. F. Jesus, R. F. L. Holanda
EUROPEAN PHYSICAL JOURNAL C
(2019)
Article
Astronomy & Astrophysics
R. de C. Lima, Jose A. C. Nogales, S. H. Pereira
INTERNATIONAL JOURNAL OF MODERN PHYSICS D
(2020)
Article
Astronomy & Astrophysics
J. F. Jesus, R. Valentim, A. A. Escobal, S. H. Pereira
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2020)
Review
Physics, Multidisciplinary
S. H. Pereira, R. de C. Lima, M. E. S. Alves, T. M. Guimaraes, J. F. Jesus, A. P. S. Souza
EUROPEAN PHYSICAL JOURNAL-SPECIAL TOPICS
(2020)
Article
Astronomy & Astrophysics
R. F. L. Holanda, G. Pordeus-da-Silva, S. H. Pereira
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2020)
Article
Physics, Particles & Fields
T. M. Guimaraes, R. de C. Lima, S. H. Pereira
Summary: A feasible model for inflation driven by a torsion function in a Friedmann background is presented, with a scalar spectral index in the range 0.92 ≤ ns ≤ 0.97 to satisfy initial inflationary conditions. Post inflationary phase is studied, with analytical solutions obtained for scale factor and energy density, indicating a small deviation from the standard model evolution. The same torsion function also satisfactorily describes recent universe acceleration, possibly suggesting a unification of different phases beyond specific constants.
EUROPEAN PHYSICAL JOURNAL C
(2021)
Article
Astronomy & Astrophysics
R. F. L. Holanda, S. H. Pereira, Deepak Jain
Article
Astronomy & Astrophysics
R. F. L. Holanda, S. H. Pereira, V. C. Busti, C. H. G. Bessa
CLASSICAL AND QUANTUM GRAVITY
(2017)
Article
Astronomy & Astrophysics
R. F. L. Holanda, S. H. Pereira, S. Santos da Costa
Article
Astronomy & Astrophysics
A. S. S. Pinho, S. H. Pereira, E. L. Mendonca
REVISTA MEXICANA DE ASTRONOMIA Y ASTROFISICA
(2017)
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.
