Article
Mathematics
Jaroslaw Mederski, Alessio Pomponio
Summary: Using variational methods, this paper seeks non-trivial solutions to a problem involving the function a and continuous nonlinearity g. The growth conditions of g at 0 and infinity are considered, along with the behavior of a as it approaches 1-. The paper successfully finds a radial solution with finite energy.
JOURNAL OF DIFFERENTIAL EQUATIONS
(2023)
Article
Physics, Multidisciplinary
G. Abbas, M. Azam, A. Ditta
Summary: This study investigates the accretion of an isotropic fluid onto a Born-Infeld black hole by formulating key parameters with the help of the barotropic equation of state and conservation laws. The spherically symmetric accretion of stiff fluid, dust fluid, quintessence fluid, and phantom fluid is analyzed, showing different trends in black hole mass change. The results indicate that the black hole mass increases for stiff fluid, dust fluid, and quintessence fluid, but decreases for phantom fluid.
CHINESE JOURNAL OF PHYSICS
(2021)
Article
Physics, Particles & Fields
Kimet Jusufi, Salvatore Capozziello, Sebastian Bahamonde, Mubasher Jamil
Summary: We use observational data to constrain a black hole solution of extended teleparallel gravity models based on the S2 star orbiting the Galactic Center. We construct the shadow images of the Sgr A* black hole and find that the shadow radius increases with the parameter alpha. The observables, such as the deflection angle and angular diameter, are close to the Schwarzschild case. However, the electromagnetic intensity observed in the shadow images is smaller compared to General Relativity (GR), indicating differences in the Born-Infeld f(T) gravity.
EUROPEAN PHYSICAL JOURNAL C
(2022)
Article
Physics, Particles & Fields
M. Dehghani
Summary: Two novel classes of four-dimensional exact black hole solutions have been obtained in the scalar-tensor theory coupled to Born-Infeld electrodynamics. The solutions have been derived using a conformal transformation and their properties have been studied in different reference frames. The results show that these black holes exhibit similar thermodynamic properties and stability as the Einstein-dilaton black holes.
EUROPEAN PHYSICAL JOURNAL C
(2023)
Article
Astronomy & Astrophysics
Peng Wang, Houwen Wu, Haitang Yang
Summary: This study explores the phenomenon of spontaneous scalarization in the EBIS model, revealing two types of scalarized black hole solutions: scalarized RN-like and scalarized Schwarzschild-like solutions. Contrary to the EMS model, the behavior of scalarized solutions in the EBIS model shows significant differences, particularly in the domain of existence and entropy of scalarized Schwarzschild-like solutions.
Article
Astronomy & Astrophysics
Yu Sang, Qing-Guo Huang
Summary: Oscillons are long-lived, localized, oscillating nonlinear excitations of a real scalar field that can be abundantly produced during preheating after inflation. The first (3 + 1)-dimensional simulation for oscillon formation during preheating with noncanonical kinetic terms, such as the Dirac-Born-Infeld form, shows that the formation of oscillons is significantly influenced by the noncanonical effect.
Article
Astronomy & Astrophysics
V. C. Tavares, C. J. A. P. Martins
Summary: The study concludes that the potential in these models needs to be extremely flat, and the dark energy equation of state deviates within 95.4% confidence levels for the rolling tachyon and Chaplygin components.
Article
Physics, Particles & Fields
Diego Julio Cirilo-Lombardo
Summary: A new Weyl Born Infeld model is proposed, based on the formalism for the mathematical description of conformal gravity using local twistor geometry. Similar to the pure Maxwell case, the electromagnetic field is naturally incorporated into this scheme by modifying the local twistor parallel transport law. The dynamical equations for gravity and the electromagnetic field can only be obtained by imposing a geometric condition on a particular function of the invariants.
EUROPEAN PHYSICAL JOURNAL C
(2023)
Article
Astronomy & Astrophysics
F. T. Falciano, M. L. Penafiel, J. C. Fabris
Summary: This study investigates the validity of Bekenstein's entropy bound for a charged black hole in the context of nonlinear electrodynamics, and finds that the bound is violated in the Born-Infeld theory.
Article
Astronomy & Astrophysics
Victor Afonso, Cecilia Bejarano, Rafael Ferraro, Gonzalo J. Olmo
Summary: The study examines a model of gravity and electromagnetism inspired by Born-Infeld, treating both fields equally through a determinantal approach in a metric-aft me formulation. Despite being in conflict with the postulates of metric gravity theories, the resulting equations can also be derived from an action combining the Einstein-Hilbert action with a minimally coupled nonlinear electrodynamics. As an example, the dynamics of a charged static black hole is solved.
Article
Astronomy & Astrophysics
P. De Fabritiis, P. C. Malta, J. A. Helayel-Neto
Summary: This work extends the U(1)Y sector of the Standard Model and investigates the quartic effective interactions between neutral gauge bosons. It studies the effects of high-energy processes that result in three photons, namely Z-boson decay and electron-positron annihilation. Current experimental data does not provide reliable lower bounds on the mass parameter p, but it is estimated that future e-e thorn colliders can exclude a certain range of p values with better statistics. The study also discusses neutral gauge-boson scatterings and relates the findings to recent results on anomalous quartic gauge couplings.
Article
Physics, Particles & Fields
Aoyun He, Jun Tao, Peng Wang, Yadong Xue, Lingkai Zhang
Summary: In this study, we investigate the shadows of Born-Infeld black holes with magnetic monopoles and Schwarzschild black holes embedded in a uniform Born-Infeld magnetic field. We analyze the effects of nonlinear electromagnetic interactions on the shadow size and the motion of photons in the magnetic field.
EUROPEAN PHYSICAL JOURNAL C
(2022)
Article
Astronomy & Astrophysics
Huan-Huan Li, Si-Jiang Yang, Shao-Wen Wei
Summary: This study investigates the relaxation rate in Born-Infeld black holes and discovers the correlations between the relaxation rate, black hole charge, and Born-Infeld parameter.
GENERAL RELATIVITY AND GRAVITATION
(2022)
Article
Physics, Particles & Fields
Thanyagamon Kanesom, Phongpichit Channuie, Narakorn Kaewkhao
Summary: This work provides a short recap of the formal framework of the EiBI theory, deriving the point-like Lagrangian for the underlying theory using Noether gauge symmetries (NGS). The study involves analyzing a Hessian matrix and quantifying the Euler-Lagrange equations of the EiBI universe, while also discussing the NGS approach for the Eddington-inspired Born-Infeld theory and demonstrating the existence of a de Sitter solution in this gravity model.
EUROPEAN PHYSICAL JOURNAL C
(2021)
Article
Physics, Multidisciplinary
Gunjan Varshney, Umesh Kumar Sharma, Anirudh Pradhan, Narendra Kumar
Summary: This study examines the relationship between Tsallis holographic dark energy and various scalar field models in the context of f(R, T) gravity, revealing that under certain constraints, accelerated expansion can be achieved in the framework of f(R, T) gravity.
CHINESE JOURNAL OF PHYSICS
(2021)
Article
Physics, Multidisciplinary
Shao-Wen Wei, Yu-Xiao Liu, Robert B. Mann
Summary: This article treats black hole solutions as defects in the thermodynamic parameter space and investigates the relationship between the topological number and the thermodynamic properties of black holes. By using the topological number, different black hole systems can be better distinguished and understood.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Particles & Fields
Yi Zhong, Ke Yang, Yu-Xiao Liu
Summary: This work investigates thick branes in Rastall gravity and constructs three types of maximally symmetric thick brane models. It is found that the properties of tensor modes differ in different types of brane models, with variations in the stability conditions for the Rastall parameter.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Particles & Fields
Hui-Min Wang, Zi-Chao Lin, Shao-Wen Wei
Summary: This paper investigates the optical appearance of static and spherically symmetric black holes in Einstein-AEther theory, showing that the direct image contributes the most to the total flux, while the lensing ring and photon ring have minimal impact. The optical appearances are significantly influenced by coupling constants.
Article
Physics, Particles & Fields
Le-Chen Qu, Hong-Yue Jiang, Yu-Xiao Liu
Summary: In this study, we investigated the multifold complexity and Loschmidt echo of an inverted harmonic oscillator. By providing analytic expressions and considering the longest permutation in the time combination, we proved that complexity is dominated by this permutation in an alternating zig-zag order, which agrees with the results obtained through holography. We conjecture that this general structure of multifold complexity holds universally for generic quantum systems with a large number of precursors.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Particles & Fields
Jing-Cheng Chang, Song He, Yu-Xiao Liu, Long Zhao
Summary: This study extends the double holography theory by considering two end-of-the-world (EOW) branes in the dual bulk spacetime. It verifies the proposed theory by calculating the entanglement entropy in both Anti-de Sitter gravity and de Sitter gravity.
JOURNAL OF HIGH ENERGY PHYSICS
(2023)
Article
Physics, Particles & Fields
Meng-Ting Wang, Hong-Yue Jiang, Yu-Xiao Liu
Summary: The connection between quantum information and quantum gravity has attracted the interest of physicists. A new class of gravitational observables has been proposed to explore holographic complexity. This paper investigates the generalized volume-complexity for the Reissner-Nordstrom-AdS black hole in 4 dimensions. The findings suggest a discontinuous variation in bulk physics that represents the complexity of the thermofield double state defined on the boundary.
JOURNAL OF HIGH ENERGY PHYSICS
(2023)
Article
Physics, Particles & Fields
Yu-Qi Dong, Yu-Qiang Liu, Yu-Xiao Liu
Summary: In this study, we explore the parameter space and gravitational waves in a spatially flat Universe in the context of Palatini-Horndeski theory. We develop a general method to determine the speed of gravitational waves in the Palatini formalism in a cosmological background and find that if the theory satisfies the condition that the tensor gravitational wave speed is equal to the speed of light c in any spatially flat cosmological background, then only the action S=integral d4x-g[K(phi ,X)-G3(phi ,X)square~phi +G4(phi )R~] remains as a possible action in Palatini-Horndeski theory. Additionally, we find that when G5(phi ,X) is not equal to 0, the tensor component of the connection propagates and there are two different tensor gravitational wave speeds.
EUROPEAN PHYSICAL JOURNAL C
(2023)
Article
Astronomy & Astrophysics
Na Xu, Jing Chen, Yu-Peng Zhang, Yu-Xiao Liu
Summary: In this study, the properties of thick branes generated by a bulk scalar field in the five-dimensional Einstein-Gauss-Bonnet gravity were investigated. A series of multikink brane solutions were obtained using the superpotential method. The linear stability of the brane system under tensor perturbations was analyzed and proven to be stable. Localization of the massless graviton near the brane was shown, resulting in the recovery of the four-dimensional Newtonian potential. It was found that the Gauss-Bonnet term can determine whether the scalar field is multikink or single kink by comparing the properties of these thick branes under different superpotentials.
Article
Physics, Particles & Fields
Zheng-Quan Cui, Yu-Xiao Liu
Summary: We investigate domain wall solutions of a real spinor field coupled with gravitation in five dimensions. A class of soliton configurations, acting as walls in five dimensions, is found with the support of a nonlinear spinor field. The study explores various solutions in the presence of nonconstant and constant curvature bulk spacetimes, showing that some of these solutions exhibit energy density distributions of domain walls for the spinor field. The stability of these spinor configurations is examined through linear perturbations and the localization of the zero mode of tensor perturbations is also discussed.
EUROPEAN PHYSICAL JOURNAL C
(2023)
Article
Astronomy & Astrophysics
Bao-Min Gu, Fu-Wen Shu, Ke Yang, Yu-Peng Zhang
Summary: By studying a toy inflation model with a local minimum, it is found that the curvature perturbations are enhanced when the inflaton passes through the local minimum, leading to the production of primordial black holes (PBHs) on small scales. The PBHs could potentially make up the total dark matter in the mass window of 10^16-10^20 g.
Article
Astronomy & Astrophysics
Wen-Di Guo, Qin Tan, Yu-Xiao Liu
Summary: This paper investigates the quasinormal modes of a charged black hole with scalar hair, obtaining the fundamental frequencies numerically and studying the effect of magnetic charge on the modes.
Article
Astronomy & Astrophysics
Xue-Hao Zhang, Shao-Dong Zhao, Soumya D. Mohanty, Yu-Xiao Liu
Summary: This study investigates the benefits of jointly analyzing data from the LISA and Taiji detectors in improving Galactic binary resolution and parameter estimation. The analysis of simulated data shows that a coherent network analysis significantly increases the number of confirmed sources and reduces the residual after subtracting sources, bringing it closer to the expected confusion noise.
Article
Astronomy & Astrophysics
Qin Tan, Wen-Di Guo, Yu-Xiao Liu
Summary: This study investigates the quasinormal modes of a thick brane system, revealing a set of discrete quasinormal modes that reflect the structural characteristics of the thick brane. These modes appear as decaying massive gravitons for a brane observer.
Article
Physics, Particles & Fields
Hao Yu, Ke Yang, Jin Li
Summary: This study investigates the impact of running vacuum (RVMs) on the baryon-to-photon ratio and suggests that if running vacuum is coupled to photons or baryons, the corresponding coefficient must be much smaller than previous research suggests, making it difficult to distinguish RVMs from the standard ACDM model. Thus, RVMs that are barely distinguishable from the ACDM model appear to be unconvincing.
EUROPEAN PHYSICAL JOURNAL C
(2022)
Article
Physics, Particles & Fields
Ke Yang, Bao-Min Gu, Yu-Peng Zhang
Summary: A spinning test particle in the Eddington-inspired Born-Infeld gravity near an electrically charged black hole is studied. It is found that the orbital eccentricity decreases with an increase in the deviation parameter. The observed orbits with large radii do not provide stringent constraints. The parameters of the innermost stable circular orbit decrease monotonically with the deviation parameter when the spin angular momentum is small, but they have a non-monotonic behavior when the spin is large enough.
EUROPEAN PHYSICAL JOURNAL C
(2022)
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.
