Article
Physics, Particles & Fields
Bilguun Bayarsaikhan, Sunly Khimphun, Phearun Rithy, Gansukh Tumurtushaa
Summary: We examine the regularized four-dimensional Einstein-Gauss-Bonnet (4DEGB) gravity coupled with a non-minimal scalar coupling function, extending the regularized 4DEGB theory. Introducing the non-minimal coupling to the Gauss-Bonnet term results in additional contributions to the dynamical equations, absent in the dimensionally regularized theory. We employ the dynamical system approach based on fixed points to analyze the stability of the system, and investigate the time evolution to constrain cosmological parameters by studying the history of the universe using observational data.
EUROPEAN PHYSICAL JOURNAL C
(2023)
Article
Physics, Particles & Fields
Fei Wang, Rui Wang
Summary: This study proposes a method to introduce non-minimal couplings of the Affleck-Dine (AD) field to the Ricci scalar curvature. Numerical simulations show that Q-balls can successfully form even with non-negative K parameters, and the associated gravitational wave (GW) production and its dependence on parameters are discussed.
EUROPEAN PHYSICAL JOURNAL C
(2022)
Article
Physics, Particles & Fields
Parviz Goodarzi
Summary: This work investigates the mechanism of gravitational baryogenesis in the framework of the non-minimal derivative coupling model. It is shown that the baryon asymmetry can be generated at both low and high reheating temperatures through the coupling between the derivative of the Ricci scalar curvature and the baryon current.
EUROPEAN PHYSICAL JOURNAL C
(2023)
Article
Physics, Particles & Fields
Muhammadsorfee Dolohtahe, Watcharakorn Srikom, Phongpichit Channuie, Narakorn Kaewkhao
Summary: This study examines the solutions of the system of equations obtained by applying the Noether gauge symmetry and its conserved quantity for the standard general relativity and the non-minimal derivative coupling cosmological model. The solutions exhibit unique features such as a kinetic-dominant phase before the inflationary period in the standard general relativity case and a new form of scalar field governed by the exponential cosmological solution in the non-minimal derivative coupling case.
EUROPEAN PHYSICAL JOURNAL C
(2022)
Article
Astronomy & Astrophysics
Parviz Goodarzi
Summary: We study anisotropic inflation in non-minimal derivative coupling model, where the scalar field is non-minimally coupled to the U(1) gauge fields and the derivative of the scalar field is non-minimally coupled to the Einstein tensor. Power-law anisotropic solutions are found within the framework when both the inflaton potential and the gauge kinetic function are power-law type in the high friction regime. We demonstrate numerically that there is an anisotropic attractor solution for a wide range of model parameters, and analytically show that there are two phases of inflation, isotropic and anisotropic, similar to anisotropic inflation in the minimal coupling model. The number of e-folds corresponding to each phase of slow roll inflation can be changed by altering the gauge coupling constant or non-minimal derivative coupling constant. The numerical and analytical solutions in this investigation show the best agreement.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Physics, Multidisciplinary
H. Moradpour, H. Shabani, A. H. Ziaie, Umesh Kumar Sharma
Summary: The study suggests that in the framework of the generalized Rastall theory, by understanding the G profile, one can determine the non-minimal coupling between energy source and geometry in a way that is compatible with the current accelerated universe.
EUROPEAN PHYSICAL JOURNAL PLUS
(2021)
Article
Astronomy & Astrophysics
Oleg Lebedev, Timofey Solomko, Jong-Hyun Yoon
Summary: We study the production of scalar dark matter through its non-minimal coupling to gravity post-inflation. Resonant dark matter production occurs when the non-minimal coupling xi is greater than or equal to 5 during the inflaton oscillation epoch. For xi values above 30, backreaction on the curvature and rescattering effects become important, invalidating simple estimates of production efficiency. At large couplings, the dark matter yield becomes almost independent of xi, indicating approximate quasi-equilibrium in the inflaton-dark matter system. The presence of apparent negative energy in the Jordan frame complicates the analysis, but can be regulated by introducing mild dark matter self-interaction. Using lattice simulations, we determine the parameter space leading to the correct dark matter relic abundance.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2023)
Article
Physics, Multidisciplinary
A. R. P. Moreira, J. E. G. Silva, C. A. S. Almeida
Summary: This study investigates a spin 1/2 fermion in a teleparallel f(T) domain wall thick braneworld. By considering a non-minimal coupling between the fermion and torsion, a geometric alternative to the Yukawa coupling is discovered. The torsion parameters determine the width of the massless Kaluza-Klein mode and the properties of the quantum potential near the origin. Additionally, the non-normalized massive fermionic modes are analyzed.
Article
Astronomy & Astrophysics
Wei Cheng, Xuewen Liu, Ruiyu Zhou
Summary: This paper studies the cosmological inflation and dark matter within a Z3 complex scalar model and finds that the mixing angle, DM mass, and Higgs-like scalar mass are constrained in the low-energy scale. It also suggests that measuring the tensor-to-scalar ratio with higher precision can distinguish between the two forms of inflation in the high-energy scale.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2023)
Article
Astronomy & Astrophysics
Nilay Bostan
Summary: This study investigates the impact of non-minimal coupling in Palatini gravity on inflationary parameters, focusing on single-field inflation models with non-zero vacuum expectation value. The analysis considers well-known symmetry-breaking potentials and shows their compatibility with recent measurements. Additionally, the study explores the inflationary predictions of selected values in the Palatini formalism.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Physics, Particles & Fields
Sotirios Karamitsos, Alessandro Strumia
Summary: Transforming canonical scalars to the Einstein frame can lead to a multi-field generalization of pole inflation with vanishing field-dependent Planck mass. However, certain non-generic conditions must be satisfied by the scalar potential to achieve an attractor. These conditions are automatically fulfilled in Quantum Field Theories with dimension-less couplings.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Particles & Fields
Claudio Gomes, Kamel Ourabah
Summary: We present a quantum treatment of the Jeans gravitational instability in the Newtonian limit of the non-minimal matter-curvature coupling gravity model. We use Wigner functions to represent quantum states in a classical phase space and formulate a quantum kinetic treatment of this problem. The model is studied in special cases and compared with the observed stability of Bok globules.
EUROPEAN PHYSICAL JOURNAL C
(2023)
Article
Physics, Particles & Fields
Maria Ortiz-Banos, Mariam Bouhmadi-Lopez, Ruth Lazkoz, Vincenzo Salzano
Summary: This study explores a modified theory of gravity with non-minimal coupling to matter, showing that gravitational coupling to matter can drive accelerated expansion of the universe. Analytical solutions for the functions f1 and f2 were calculated for different energy density contents, supporting the conclusion. Cosmographic analysis was also performed to further understand the impact of gravitational coupling.
EUROPEAN PHYSICAL JOURNAL C
(2021)
Article
Physics, Multidisciplinary
B. S. Goncalves, P. H. R. S. Moraes, B. Mishra
Summary: We have constructed a cosmological model based on the f(R, L-m) gravity theory, incorporating the Friedmann-Lemaitre-Robertson-Walker metric and the field equations. Our chosen function, R/16p + (1 + sR)L-m, includes a constant s representing the geometry-matter coupling. Our solutions are notable for evading the Big Bang singularity and accurately predicting cosmic acceleration without requiring the cosmological constant, due to the presence of geometry-matter coupling terms in the Friedmann-like equations.
FORTSCHRITTE DER PHYSIK-PROGRESS OF PHYSICS
(2023)
Article
Physics, Multidisciplinary
Xiang-Nan Zhou, Wei-Qi Guo
Summary: This paper investigates the localization of a five-dimensional gravitino field on a thick brane with non-minimal coupling. By choosing an appropriate gauge condition, the equations for the Kaluza-Klein (KK) modes of gravitino are obtained. Compared to the case without non-minimal coupling, the inclusion of non-minimal coupling allows for the localization of both the zero mode and massive KK modes of a five-dimensional free massless gravitino field on the brane. The study also finds that the non-minimal coupling modifies the mass spectrum of the KK modes and offers more possibilities for localization.
Article
Astronomy & Astrophysics
Behnaz Fazlpour, Ali Banijamali
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2015)
Article
Physics, Particles & Fields
Behnaz Fazlpour, Ali Banijamali
ADVANCES IN HIGH ENERGY PHYSICS
(2015)
Article
Physics, Multidisciplinary
A. Banijamali, B. Fazlpour, R. Rouhollahi, M. Gholamzadeh
CHINESE JOURNAL OF PHYSICS
(2016)
Article
Physics, Multidisciplinary
A. Banijamali, E. Ghasemi
INTERNATIONAL JOURNAL OF THEORETICAL PHYSICS
(2016)
Article
Astronomy & Astrophysics
Ali Banijamali, Milad Solbi
GENERAL RELATIVITY AND GRAVITATION
(2017)
Article
Astronomy & Astrophysics
A. Banijamali, S. Bellucci, B. Fazlpour, M. Solbi
ASTROPHYSICS AND SPACE SCIENCE
(2018)
Article
Physics, Multidisciplinary
Behnaz Fazlpour, Ali Banijamali
CHINESE JOURNAL OF PHYSICS
(2018)
Article
Astronomy & Astrophysics
J. Sadeghi, A. Banijamali, H. Vaez
ASTROPHYSICS AND SPACE SCIENCE
(2013)
Article
Physics, Multidisciplinary
J. Sadeghi, A. Banijamali, E. Reisi
CANADIAN JOURNAL OF PHYSICS
(2013)
Article
Physics, Particles & Fields
Behnaz Fazlpour, Ali Banijamali
ADVANCES IN HIGH ENERGY PHYSICS
(2013)
Article
Physics, Particles & Fields
Ali Banijamali
ADVANCES IN HIGH ENERGY PHYSICS
(2014)
Article
Physics, Mathematical
Behnaz Fazlpour, Ali Banijamali
INTERNATIONAL JOURNAL OF GEOMETRIC METHODS IN MODERN PHYSICS
(2019)
Article
Astronomy & Astrophysics
S. Bellucci, A. Banijamali, B. Fazlpour, M. Solbi
ASTROPHYSICS AND SPACE SCIENCE
(2019)
Article
Astronomy & Astrophysics
Ali Banijamali, Behnaz Fazlpour, Valerio Faraoni
Article
Physics, Multidisciplinary
A. Banijamali
COMMUNICATIONS IN THEORETICAL PHYSICS
(2016)
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.
