Article
Astronomy & Astrophysics
Nikos Chatzifotis, Panagiotis Dorlis, Nick E. Mavromatos, Eleftherios Papantonopoulos
Summary: We discuss the thermodynamical stability of hairy black hole spacetimes by considering the backreaction of secondary hair on the spacetime geometry. We derive the conditions for a stable thermal equilibrium between the hairy black hole and the heat bath in a model independent way. Our results suggest that if the scalar hair induces an inner horizon in the deformed geometry, a thermodynamically stable configuration will be reached with the black hole becoming extremal in its final stage. We also make some conjectures about the implications of this thermal stability for the existence of a minimum length in quantum spacetime.
Article
Astronomy & Astrophysics
Masato Minamitsuji
Summary: The analysis shows that the difference between comoving curvature perturbations in the original and new frames on superhorizon scales is determined by a combination of time derivatives, intrinsic entropy perturbations of the scalar field, and their time derivatives. Comoving curvature perturbations can remain invariant under disformal transformations on superhorizon scales under certain conditions, while tensor perturbations can also remain disformally invariant if conserved over time in the original frame.
Article
Astronomy & Astrophysics
Anna Ijjas, Roman Kolevatov
Summary: This paper explains how entropic perturbations generated during slow contraction can lead to a nearly scale-invariant spectrum of curvature perturbations on length scales larger than the Hubble radius during the transition to a classical nonsingular bounce (graceful exit phase). By the end of the graceful exit phase, the initial entropic fluctuations have become negligible while the curvature fluctuations have a nearly scale-invariant spectrum with an amplitude consistent with observations.
Article
Astronomy & Astrophysics
Sudip Karan, Binata Panda
Summary: This study presents a consolidated manual on Euclidean gravity methods for determining the logarithmic corrections to the entropy of the Kerr-Newman black hole family. Through calculating Seeley-DeWitt coefficients and logarithmic corrections, the impact of different fields in a generalized Einstein-Maxwell theory on black hole entropy is explored.
Article
Physics, Particles & Fields
G. Lambiase, G. G. Luciano, A. Sheykhi
Summary: In this study, a new cosmological scenario is proposed based on Kaniadakis entropy and modified Friedmann equations. The research finds that the Kaniadakis parameter is constrained by observational limits and the correction term has a non-trivial effect on the growth of perturbations in the early stages of the Universe.
EUROPEAN PHYSICAL JOURNAL C
(2023)
Article
Physics, Multidisciplinary
Kazufumi Takahashi, Masato Minamitsuji, Hayato Motohashi
Summary: By generalizing the invertible disformal transformation on Horndeski theories with higher derivatives, we have constructed a new class of ghost-free scalar-tensor theories, which we refer to as generalized disformal Horndeski theories. These theories go beyond the quadratic/cubic DHOST class. We have explored cosmological perturbations and identified a subclass where gravitational waves propagate at the speed of light and clarified the conditions for the absence of ghost/gradient instabilities for tensor and scalar perturbations. We have also investigated the conditions under which a matter field can be consistently coupled to these theories without introducing unwanted extra degrees of freedom.
PROGRESS OF THEORETICAL AND EXPERIMENTAL PHYSICS
(2023)
Article
Astronomy & Astrophysics
Nicolas R. Bertini, Neven Bilic, Davi C. Rodrigues
Summary: We consider a gravity action with a function of the Ricci scalar and the Gauss-Bonnet invariant, motivated by holographic cosmology. Modified Friedmann equations and power spectra are derived and compared with results from holographic and standard cosmology.
Article
Astronomy & Astrophysics
Beatriz Elizaga Navascues, Rafael Jimenez-Llamas, Guillermo A. Mena Marugan
Summary: Scalar fields dominated by their kinetic energy may have played a significant role in the early Universe, potentially leading to modifications in observable quantities compared to standard inflationary models. These modifications primarily affect the effective mass and choice of vacuum state for cosmological perturbations during kinetically dominated epochs.
Article
Astronomy & Astrophysics
S. Shajidul Haque, Chandan Jana, Bret Underwood
Summary: In this study, we calculate the operator complexity for displacement, squeeze, and rotation operators of a quantum harmonic oscillator. We find that the complexity depends on the coherent state parameter, the amount of squeezing, and the time-dependent phase of the unitary evolution. We apply these results to study the complexity of a free massive scalar field and quantum cosmological perturbations in de Sitter space. The complexity shows a period of rapid linear growth followed by saturation and is sensitive to the number of spatial dimensions and the UV cutoff.
Article
Physics, Particles & Fields
Ahmad Sheykhi, Bita Farsi
Summary: This study investigates the effects of entropic corrections on the growth of perturbations in the early universe. The results show that the profile of density contrast differs significantly in the cosmologies with Tsallis and Barrow entropy, compared to the standard cosmology. Moreover, the growth rate of matter perturbations is found to depend strongly on the values of the Tsallis and Barrow parameters.
EUROPEAN PHYSICAL JOURNAL C
(2022)
Article
Physics, Particles & Fields
Tin-Long Chau, Pei-Ming Ho, Hikaru Kawai, Wei-Hsiang Shao, Cheng-Tsung Wang
Summary: In this study, the effect of the generalized uncertainty relation on the Hawking radiation of a Schwarzschild black hole is examined. By incorporating a minimal uncertainty length scale into the radial coordinate of the background, it is found that Hawking radiation is turned off at around the scrambling time, while the Hawking temperature remains largely unmodified.
EUROPEAN PHYSICAL JOURNAL C
(2023)
Article
Physics, Particles & Fields
Zhong-Wen Feng, Guansheng He, Xia Zhou, Xue-Ling Mu, Shi-Qi Zhou
Summary: The study explores the effects of higher-order generalized uncertainty principle on the Jeans mass of collapsing molecular clouds, revealing a modified Jeans mass lower than the original case which facilitates star formation in small mass Bok globules. The estimated range for the new generalized uncertainty principle parameter gamma(0) is between 10^11 to 10^12.
EUROPEAN PHYSICAL JOURNAL C
(2021)
Article
Physics, Particles & Fields
Muhammad Usman, Abdul Jawad
Summary: Under the framework of non-zero torsion cosmology, this study examines the growth of perturbations with respect to matter content during the cosmic evolution. Different cosmographic parameters are also discussed. The results show that in model-1 (pressureless matter), the density contrast starts growing in the early era of the Universe and grows faster with the overall expansion of the Universe for different choices of torsion parameter. In model-2 (matter with non-zero pressure), the density contrast exhibits enormous growth compared to the overall expansion, indicating the collapse of the perturbed region and formation of new large scale matter or galaxy. The behavior of the growth function significantly deviates from the pressureless dark matter model (Lambda CDM) for model-2 with non-zero dark matter and torsion.
EUROPEAN PHYSICAL JOURNAL C
(2023)
Article
Astronomy & Astrophysics
Pablo Bueno, Pablo A. Cano, Robie A. Hennigar, Mengqi Lu, Javier Moreno
Summary: This paper proves the existence of multiple inequivalent classes of order -n GQTGs in D≥5, some of which are of the quasi-topological type. Additionally, by calculating the thermodynamic charges of these GQTGs, it is verified that they satisfy the first law and can be entirely expressed in terms of the embedding function.
CLASSICAL AND QUANTUM GRAVITY
(2023)
Article
Astronomy & Astrophysics
Ryotaro Kase, Shinji Tsujikawa
Summary: We present a general framework for studying the relativistic star perturbations on a static and spherically symmetric background in full Horndeski theories. Our formulation takes into account a perfect fluid as a form of the Schutz-Sorkin action, allowing the derivation of second-order actions for perturbations in odd- and even-parity sectors without the need for specific gauge conditions. This versatile framework can be applied to any convenient gauges and provides stability conditions and perturbation equations of motion for neutron stars and black holes.
Article
Physics, Particles & Fields
Yuxun Guo, Xiangdong Ji, Kyle Shiells
Summary: This study derived a new twist-3 partonic sum rule for the transverse spin of the proton, involving quark spin structure function, transverse gluon polarization density, and canonical orbital angular momentum densities. The findings relate to a potential new class of twist-3 generalized parton distribution functions and discuss technicalities related to transverse polarization. The application of the findings to transverse-space distributions of partons, angular momentum, and magnetic moment in a transversely polarized proton is also discussed.
Article
Physics, Particles & Fields
Yi-Kai Huo, Yushan Su, Long-Cheng Gui, Xiangdong Ji, Yuan-Yuan Li, Yizhuang Liu, Andreas Schafer, Maximilian Schlemmer, Peng Sun, Wei Wang, Yi-Bo Yang, Jian-Hui Zhang, Kuan Zhang
Summary: This study investigates the renormalization of large-momentum effective theory using different fermion formulations on the lattice, and proposes a strategy to address the issue of linear divergences. The results indicate that renormalization factors are universal in hadron state matrix elements, while physical matrix elements appear independent of the fermion formulation.
Article
Physics, Multidisciplinary
Chen Cheng, Pengwei Xie, Abdusalam Abdukerim, Wei Chen, Xun Chen, Yunhua Chen, Xiangyi Cui, Yingjie Fan, Deqing Fang, Changbo Fu, Mengting Fu, Lisheng Geng, Karl Giboni, Linhui Gu, Xuyuan Guo, Ke Han, Changda He, Shengming He, Di Huang, Yan Huang, Yanlin Huang, Zhou Huang, Xiangdong Ji, Yonglin Ju, Shuaijie Li, Qing Lin, Huaxuan Liu, Jianglai Liu, Liqiang Liu, Xiaoying Lu, Wenbo Ma, Yugang Ma, Yajun Mao, Yue Meng, Parinya Namwongsa, Kaixiang Ni, Jinhua Ning, Xuyang Ning, Xiangxiang Ren, Nasir Shaheed, Changsong Shang, Guofang Shen, Lin Si, Andi Tan, Anqing Wang, Hongwei Wang, Meng Wang, Qiuhong Wang, Siguang Wang, Wei Wang, Xiuli Wang, Zhou Wang, Mengmeng Wu, Shiyong Wu, Weihao Wu, Jingkai Xia, Mengjiao Xiao, Xiang Xiao, Binbin Yan, Jijun Yang, Yong Yang, Chunxu Yu, Jumin Yuan, Ying Yuan, Xinning Zeng, Dan Zhang, Tao Zhang, Li Zhao, Qibin Zheng, Jifang Zhou, Ning Zhou, Xiaopeng Zhou
Summary: Using the PandaX-II liquid xenon detector, constraints on light dark matter interactions with shell electrons have been reported, with the world's most stringent exclusion limit on the scattering cross section within the dark matter mass range from 15 to 30 MeV/c(2).
PHYSICAL REVIEW LETTERS
(2021)
Article
Instruments & Instrumentation
Xiuli Wang, Shu Li, Yonglin Ju, Zhuoqun Lei, Jianglai Liu, Xiangdong Ji, Xuefeng Tang, Yonghua Gou
Summary: The study investigated the performance of demountable indium seals for providing ultra-low leak rates at cryogenic temperatures and high pressures, and concluded linear loads required for successful sealing. The results showed that even though the torque slightly dropped after assembly, the leak rates of the structure remained very low.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2021)
Review
Physics, Multidisciplinary
Xiangdong Ji, Yizhuang Liu, Yu-Sheng Liu, Jian-Hui Zhang, Yong Zhao
Summary: The large-momentum effective theory (LaMET) offers a new way to extract parton physics from proton properties through Lorentz symmetry. It provides an alternative to the standard formalism of partons by allowing for the extraction of various partonic observables through effective field theory matching and running. Future lattice QCD calculations could further enhance our understanding of hadronic structure and experimental data related to proton parton distribution.
REVIEWS OF MODERN PHYSICS
(2021)
Article
Physics, Multidisciplinary
Xiangdong Ji, Yizhuang Liu
Summary: The passage discusses a novel energy of pure quantum origin in the nucleon mass, resulting from anomalous breaking of scale symmetry. This energy, known as quantum anomalous energy (QAE), can be explained through a mechanism resembling the Higgs mechanism, involving couplings between nucleon and scalar resonances. Additionally, the QAE sets the scale for other energies in the nucleon through a relativistic virial theorem and provides a negative pressure to confine colored quarks.
SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
(2021)
Article
Physics, Multidisciplinary
Jijun Yang, Abdusalam Abdukerim, Wei Chen, Xun Chen, Yunhua Chen, Chen Cheng, Xiangyi Cui, Yingjie Fan, Deqing Fang, Changbo Fu, Mengting Fu, Lisheng Geng, Karl Giboni, Linhui Gu, Xuyuan Guo, Ke Han, Changda He, Shengming He, Di Huang, Yan Huang, Ran Huo, Yanlin Huang, Zhou Huang, Xiangdong Ji, Yonglin Ju, Shuaijie Li, Qing Lin, Huaxuan Liu, Jianglai Liu, Xiaoying Lu, Wenbo Ma, Yugang Ma, Yajun Mao, Yue Meng, Nasir Shaheed, Kaixiang Ni, Jinhua Ning, Xuyang Ning, Xiangxiang Ren, Changsong Shang, Guofang Shen, Lin Si, Andi Tan, Anqing Wang, Hongwei Wang, Meng Wang, QiuHong Wang, Siguang Wang, Wei Wang, Xiuli Wang, Zhou Wang, Mengmeng Wu, Shiyong Wu, Weihao Wu, Jingkai Xia, Mengjiao Xiao, Xiang Xiao, Pengwei Xie, Binbin Yan, Yong Yang, Chunxu Yu, Hai-Bo Yu, Jumin Yuan, Ying Yuan, Xinning Zeng, Dan Zhang, Tao Zhang, Li Zhao, Qibin Zheng, Jifang Zhou, Ning Zhou, Xiaopeng Zhou
Summary: Self-interacting dark matter (SIDM) is a leading candidate to address the discrepancies between theory and observation, with studies showing that a light mediator in dark matter models can offer complementary constraints through experiments and cosmology.
SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
(2021)
Article
Physics, Particles & Fields
Xiangdong Ji, Yizhuang Liu, Andreas Schaefer
Summary: The study focuses on the anomalous scale symmetry breaking effects on the proton mass in QCD, confirming the emergence of a novel contribution known as quantum anomalous energy (QAE). The origins of QAE in both lattice and dimensional regularizations are discussed, demonstrating its role as a scheme-and-scale independent component in mass decomposition. The role of QAE in the proton mass is compared to the dynamical Higgs mechanism, showing how it generates mass scales and responds to valence quarks.
Article
Astronomy & Astrophysics
Xiangdong Ji, Yizhuang Liu
Summary: This study investigates the multipole expansion of momentum currents in hadrons and their connection to nearby gravitational fields. The results show that the momentum-current distribution is not only related to energy-momentum form factors, but also strongly affects the static gravitational field inside hadrons.
Article
Astronomy & Astrophysics
Xiangdong Ji, Yizhuang Liu
Summary: Light-front wave functions are crucial in the light-front quantization approach, but their naive implementation faces challenges including the zero-mode problem, rapidity divergences, and breaking of spatial rotational symmetry. We propose to view light-front quantization as an effective theory and use the large momentum expansion of the equal-time Euclidean correlation functions to calculate light-front correlations. This large-momentum effective theory can be achieved through lattice QCD calculations.
Article
Astronomy & Astrophysics
Xiangdong Ji, Yizhuang Liu, Andreas Schaefer, Feng Yuan
Summary: This paper applies Large Momentum Effective Theory (LaMET) to calculate the single transverse-spin asymmetry from the Sivers mechanism, and verifies the result in the small transverse distance limit at one-loop order.
Article
Astronomy & Astrophysics
Xiangdong Ji, Yizhuang Liu, Ismail Zahed
Summary: The study investigates the mass/energy structure of bound states of hadrons in two-dimensional quantum chromodynamics in the large number of color limit ('t Hooft model). It reveals that masses are related to matrix elements of scalar charge and Coulomb energy, and derives light-front sum rules expressed in terms of light-front wave functions. Additionally, the research considers the result for massless Goldstone bosons and the structure of gravitational form factors in bound meson states.
Article
Astronomy & Astrophysics
Yuxun Guo, Xiangdong Ji, Yizhuang Liu
Summary: The study focuses on the near-threshold photo or electroproduction of heavy vector quarkonium off the proton, showing that the threshold kinematics has a large skewness parameter xi, leading to the dominance of the spin2 contribution. Threshold production data are useful to extract gluonic gravitational form factors and study gluonic contributions to various properties in the proton. The research uses recent GlueX data on J/Psi photoproduction to demonstrate the potential physics impact of high-precision data from future Jefferson Laboratory 12 GeV and Electron-Ion Collider physics program.
Correction
Physics, Applied
Xiangdong Ji, Feng Yuan, Yong Zhao
Summary: A correction document has been published to correct the errors in this paper.
NATURE REVIEWS PHYSICS
(2021)
Review
Physics, Applied
Xiangdong Ji, Feng Yuan, Yong Zhao
Summary: There has been significant progress in understanding the origins of proton spin, focusing on first-principles calculations and experimental measurements of total gluon helicity, quark, and gluon orbital angular momenta.
NATURE REVIEWS PHYSICS
(2021)
