Article
Physics, Multidisciplinary
Matthew D. Horner, Andrew Hallam, Jiannis K. Pachos
Summary: The interface between different quantum phases of matter can lead to new physics, such as exotic topological phases or nonunitary conformal field theories. This study explores the interface between two spin chains in different chiral phases. Surprisingly, the mean field theory approximation of this interacting composite system can be described using Dirac fermions in a curved space-time geometry. The interface between the two phases represents a black hole horizon. Analytical and numerical methods confirm this representation, and a striking prediction emerges regarding thermalization at the interface.
PHYSICAL REVIEW LETTERS
(2023)
Article
Physics, Particles & Fields
Jie Zhang, Menquan Liu, Zhie Liu, Shuzheng Yang
Summary: The Kinnersley spacetime describes a non-spherical symmetric, non-stationary, and accelerating black hole, and can be used to study the collision characteristics of two black holes. By considering the Lorentz dispersion relation, we obtained a modified radiation temperature at the event horizon and the colliding temperature at the touch point of Rindler horizon and the event horizon.
EUROPEAN PHYSICAL JOURNAL C
(2022)
Article
Astronomy & Astrophysics
Roberto Balbinot, Alessandro Fabbri
Summary: This study investigates the correlations across the horizon of both acoustic black holes and gravitational black holes in the framework of quantum field theory in curved space. The findings highlight the differences between the two cases and emphasize the importance of the particle-partner pair creation mechanism in the origin of Hawking radiation.
Article
Physics, Particles & Fields
Bhramar Chatterjee, Narayan Banerjee
Summary: In this study, we examine radiation from cosmological apparent horizon in the FLRW model using a double-null coordinate setting. Due to the dynamic nature of spacetime, a Kodama vector is used as the dynamical time instead of a timelike Killing vector. By constructing the positive frequency modes of the Kodama vector across the horizon, we determine the temperature associated with the horizon based on the conditional probability of a signal reaching the central observer during crossing.
EUROPEAN PHYSICAL JOURNAL C
(2021)
Article
Physics, Multidisciplinary
Sam Patrick, Harry Goodhew, Cisco Gooding, Silke Weinfurtner
Summary: Research has shown that fluid mechanical analogue black hole systems exhibit significant global mass changes in the presence of waves, leading to the possibility of studying backreaction with the presence of a dynamical metric.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Multidisciplinary
Vinod Kumar Bhardwaj, Priyanka Garg, Anirudh Pradhan, Syamala Krishnannair
Summary: In this study, we investigate the power-law entropy corrected holographic dark energy (PLECHDE) model with Hubble horizon cutoff. Using observational data, we constrain the model and calculate relevant cosmological parameters. The results show that the model is consistent with modern observations and matches well with current datasets.
CHINESE JOURNAL OF PHYSICS
(2022)
Article
Physics, Multidisciplinary
Lawrence Crowell
Summary: This paper reconsiders the disentanglement mechanism between black holes and Hawking radiation, viewing it as an entanglement swap that transfers entanglement and achieves the disentanglement between aged Hawking radiation and black holes, rather than with gravitons or BMS charges at I+.
FRONTIERS IN PHYSICS
(2022)
Article
Astronomy & Astrophysics
Shin'ichi Nojiri, Sergei D. Odintsov, Tanmoy Paul
Summary: In this study, the Bekenstein-Hawking entropy is modified and a new entropy function is developed to derive the usual FLRW equations for matter fluids with different equation of state parameters. The research finds that by using a general entropy based on the Bekenstein-Hawking entropy, the Friedmann equations of the apparent horizon cosmology can be modified, leading to interesting cosmological consequences.
Article
Physics, Particles & Fields
Nobuyoshi Komatsu
Summary: This study examines the connection between effective energy and thermostatistical quantities on a cosmological horizon, and finds that the derived free energy on the horizon is equivalent to the effective energy calculated from the Friedmann equation. The consistency between the two is interpreted as a holographic-like connection. The study also suggests that Padmanabhan's holographic equipartition law should lead to such a connection.
EUROPEAN PHYSICAL JOURNAL C
(2023)
Article
Physics, Multidisciplinary
Sunandan Gangopadhyay, Siham Sen, Rituparna Mandal
Summary: In this work, we calculate the Hawking temperature for a quantum corrected black hole geometry using the reflection from the horizon method. We observe that quantum gravity corrections indeed show up in the Hawking temperature formula of the quantum corrected black hole. It is important to notice that the quantum gravity corrections arise in the Hawking temperature formula only due to the underlying quantum gravity corrections to the lapse function of the black hole metric rather than the semi-classical methods used in the analysis. We also substantiate our result by computing the Hawking temperature using the tunneling approach.
Article
Astronomy & Astrophysics
Scott L. Todd, Giacomo Pantaleoni, Valentina Baccetti, Nicolas C. Menicucci
Summary: The study investigates a simple toy model of particle scattering in the flat spacetime limit of an analogue-gravity model. By performing a sonic analogue to Compton scattering, in-universe observers can determine if they are in motion with respect to their medium and find their velocity with respect to the medium. Through the interaction between the phonon field and the external particle, the Lorentz symmetry of the speed of sound in the medium is explored.
Article
Astronomy & Astrophysics
Ren Tsuda, Shinya Tomizawa, Ryotaku Suzuki
Summary: We propose a new simple model of an acoustic black hole in a thin tube by utilizing the difference in gravitational potential to generate transonic flow. The analytical solution for the Euler equations can be obtained in our transonic flow model, providing an exact solution in terms of a height function for the monatomic case with gamma 1/4 5/3. By the near-sonic approximation, we find a simple form for arbitrary gamma. Additionally, two analytic solutions describing a backward wave and a forward wave are obtained, demonstrating the existence of sonic horizons.
Article
Physics, Multidisciplinary
Stephen Eckel, Ted Jacobson
Summary: The theoretical analysis of an expanding ring-shaped Bose-Einstein condensate reveals that expansion causes the phonon frequency to cool and the amplitude to weaken. This behavior is analogous to the redshifting and Hubble friction for quantum fields in the expanding universe, and is consistent with recent experimental and theoretical results. This study demonstrates the applicability of action-based dimensional reduction methods in various settings and perturbation expansions.
Review
Physics, Multidisciplinary
Bernard Carr, Kazunori Kohri, Yuuiti Sendouda, Jun'ichi Yokoyama
Summary: In this article, constraints on the fraction of the Universe that may have gone into primordial black holes (PBHs) over a range of masses are updated. The discussion covers the reasons why PBHs smaller than a certain mass threshold are constrained and the various constraints on PBHs larger than that threshold.
REPORTS ON PROGRESS IN PHYSICS
(2021)
Article
Physics, Multidisciplinary
S. Banik, M. Gutierrez Galan, H. Sosa-Martinez, M. Anderson, S. Eckel, I. B. Spielman, G. K. Campbell
Summary: This study experimentally measures Hubble attenuation and amplification in toroidally shaped Bose-Einstein condensates and finds that the observed effects depend on the temporal phase of the phonon field, indicating nonadiabatic dynamics.
PHYSICAL REVIEW LETTERS
(2022)
Article
Pharmacology & Pharmacy
Cao Sha, Gao Jia, Zhao Jingjing, Hu Yapeng, Lou Zhi, Xu Guanghui
Summary: The study revealed that miR-486 was upregulated in AML, and its enhancement of JAK-STAT3 pathway activity promoted cell proliferation, implicating the miR-486-SOCS2-STAT3 proliferation axis in the pathogenesis of AML.
NAUNYN-SCHMIEDEBERGS ARCHIVES OF PHARMACOLOGY
(2021)
Article
Astronomy & Astrophysics
Ya-Peng Hu, Liang Cai, Xiao Liang, Shi-Bei Kong, Hongsheng Zhang
Summary: This paper investigates the P-V phase transition and critical behavior of asymptotic AdS black holes in the extended phase space, finding that four critical exponents around the critical point match those in mean field theory, and introducing a new critical exponent nu related to divergent correlation length. By studying the divergent behavior of R-N at critical point, it is discovered that this behavior is a universal property in generic black holes, with implications for the microscopic properties of black holes.
Article
Physics, Multidisciplinary
Long-Long Sun, Ya-Peng Hu, Chen-Ping Zhu, Yan-Jun Wang, Pei-Wen Yao
Summary: Investigation on passenger flight delays using statistical physics methods is lacking. This study treats flights as particles and employs quasi-thermodynamic variables to describe their behavior, proposing a new model for delay gases.
CHINESE JOURNAL OF PHYSICS
(2022)
Article
Astronomy & Astrophysics
Xiao-Jun Gao, Ji-Ming Chen, Hongsheng Zhang, Yihao Yin, Ya-Peng Hu
Summary: This paper investigates the explicit calculation of two new types of metrics in the strong field limit, showing that Bozza's original method of choosing integration variables may lead to technical difficulties.
Article
Materials Science, Multidisciplinary
Ganggang Zhang, Yingbin Hu, Dong Hou, Dongxuan Yang, Qingchuan Zhang, Yapeng Hu, Xinliang Liu
Summary: The porosity defects in the ingot caused by moisture absorption in slag during electroslag remelting process require accurate prediction of slag weight gain rate. The results from machine learning models indicate that the rate of weight gain in slag is influenced by air humidity, experimental time, slag particle size, and CaO content.
Article
Astronomy & Astrophysics
Haximjan Abdusattar, Shi-Bei Kong, Yihao Yin, Ya-Peng Hu
Summary: This paper investigates the thermodynamics of the McVittie space-time, particularly focusing on the Hawking-Page-like phase transition. The formulation of thermodynamic laws and equations specific to the McVittie black hole provides insights into the possibility of phase transitions under certain conditions.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Mechanics
Long-Long Sun, Ya-Peng Hu, Chen-Ping Zhu, Farinaz Roshani
Summary: By introducing an exponent alpha and considering spatial constraints, we propose a new weighted network model for describing the link weight distributions of passenger air transportation networks. The model is consistent with empirical results and can be applied to different air transportation systems and other fields.
JOURNAL OF STATISTICAL MECHANICS-THEORY AND EXPERIMENT
(2022)
Article
Physics, Particles & Fields
Shi-Bei Kong, Haximjan Abdusattar, Hongsheng Zhang, Ya-Peng Hu
Summary: We investigate the thermodynamic properties of the FRW universe in the brane world scenario, with a focus on the Randall-Sundrum II model. By applying the first law of thermodynamics to the FRW universe, we establish a relationship between the work density and the thermodynamic pressure. We construct the equation of state for the FRW universe, which does not exhibit a phase transition. Additionally, we study the Joule-Thompson expansion and determine the Joule-Thompson coefficient, which is influenced by the brane tension. These findings offer novel means to test the brane world scenario and extra dimensions.
Article
Physics, Multidisciplinary
Long Long Sun, Ya Peng Hu, Chen Ping Zhu
Summary: Flight delays in passenger air transportation systems can cause various troubles to people's daily life. Empirical studies show different inter-correlations at the microscopic level, and a simple law similar to that for gases at the macroscopic level. Inconsistent theoretical models have led to debates, and the emergence of macroscopic law from detailed cross-correlations is an open question. An empirical benchmark is needed to settle the debates.
PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS
(2023)
Article
Physics, Particles & Fields
Haximjan Abdusattar, Shi-Bei Kong, Wen-Long You, Hongsheng Zhang, Ya-Peng Hu
Summary: In this study, we investigate gravitational pressure in cosmic thermodynamics using a first principle approach. The pressure is derived from the unified first law and the Einstein field equation in spherically symmetric spacetime. By applying this pressure, we establish the thermodynamics of the FRW universe and obtain the gravitational equation of state for the FRW spacetime. Furthermore, we explore the cooling-heating properties of the FRW universe through the Joule-Thomson expansion, finding an inversion temperature when the enthalpy of the FRW universe is negative. These findings provide insights into the evolution of our universe from a thermodynamic perspective.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Multidisciplinary
Long-Long Sun, Ya-Peng Hu, Chen-Ping Zhu
Summary: Air transportation networks were constructed using American domestic passenger flight records from 1995 to 2020, and betweenness and eigenvector centralities were calculated for airports. Anomalies were observed in 15-30% of airports in the unweighted and undirected networks based on eigenvector centrality, but disappeared when considering link weights or directionalities. Five widely used models for air transportation networks were evaluated, showing that spatial constraints are necessary to eliminate anomalies detected by eigenvector centrality, providing references for parameter selection in the models. The empirical benchmarks reported in this paper are expected to stimulate more theoretical modeling works on air transportation systems.
EUROPEAN PHYSICAL JOURNAL PLUS
(2023)
Article
Physics, Multidisciplinary
Arshad Ali, Ya-Peng Hu, Mudassar Sabir, Taotao Sui
Summary: We revisit the issue of gauge dependence in scalar-induced secondary gravitational waves (SIGWs) during the radiation domination (RD) and matter domination (MD) eras. The energy density spectrum is the main physical observable for SIGWs. We calculate SIGWs in different gauges to address the divergence in energy density & omega;(GW) and discuss the physical origin of the observed gauge dependence.
SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
(2023)
Article
Physics, Particles & Fields
Xiao-Jun Gao, Xiao-kun Yan, Yihao Yin, Ya-Peng Hu
Summary: We investigated the gravitational lensing effect around a spherically symmetric black hole, taking into account its electric charge and perfect-fluid dark matter. Our analytical calculations in the weak field limit considered the small abundance of both the charge and the dark matter compared to the black hole mass. We obtained the light deflection angle and the size of the Einstein ring, with careful approximations for the logarithmic term from the perfect-fluid dark matter. Our results may be useful in connecting the theoretical model of perfect-fluid dark matter with observations of celestial bodies surrounded by thin dark matter.
EUROPEAN PHYSICAL JOURNAL C
(2023)
Article
Physics, Particles & Fields
Shi-Bei Kong, Haximjan Abdusattar, Yihao Yin, Hongsheng Zhang, Ya-Peng Hu
Summary: In this paper, we derive the equations of state for the FRW universe in Einstein gravity and a modified gravity. The equation of state from Einstein gravity shows no P-V phase transition, while the equation of state from the modified gravity does, with the critical exponents being the same as those in mean field theory.
EUROPEAN PHYSICAL JOURNAL C
(2022)
Article
Astronomy & Astrophysics
Sang Ao-Fei, Liang Xiao, Hu Ya-Peng
Summary: The study reveals that the relationship between the moment of inertia I and gravitational quadrupole moment Q of a neutron star, known as the I-Q relation, is independent of the state equation of matter inside the star and only related to gravitational theories. Under the dRGT massive gravity with massive graviton, the I-Q relation still holds but the proportional coefficient depends on the graviton mass parameter m.
SCIENTIA SINICA-PHYSICA MECHANICA & ASTRONOMICA
(2021)
