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Wormholes in f(R,T)=R+λT+λ1T2gravity 认领 引用
1
作者 F Parsaei S Rastgoo 《Communications in Theoretical Physics》 SCIE CAS CSCD 2026年第2期88-97,共10页
This study explores asymptotically flat wormhole solutions within the framework of f(R,T)gravity.We analyze f(R,T)expressed as f(R,T)=R+λT+λ1T2.A linear equation of state(EoS)is employed for both radial and la... This study explores asymptotically flat wormhole solutions within the framework of f(R,T)gravity.We analyze f(R,T)expressed as f(R,T)=R+λT+λ1T2.A linear equation of state(EoS)is employed for both radial and lateral pressures,resulting in a power-law shape function.The investigation encompasses solutions characterized by both negative and positive energy densities.It has been determined that solutions with positive energy density comply with all energy conditions,specifically the null,weak,strong,and dominant energy conditions.Additionally,we identify constraints on the parametersλ,λ1,and the parameters associated with the EoS and shape function. 展开更多
关键词 wormhole f(R,T) energy condition modified theory of gravity
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f(T) modified teleparallel gravity as an alternative for holographic and new agegraphic dark energy models 认领 引用 被引量：2
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作者 Kayoomars Karami Asrin Abdolmaleki 《Research in Astronomy and Astrophysics》 SCIE CAS CSCD 2013年第7期757-771,共15页
In the present work, we reconstruct different f（T）-gravity models corre- sponding to the original and entropy-corrected versions of the holographic and new agegraphic dark energy models. We also obtain the equation ... In the present work, we reconstruct different f（T）-gravity models corre- sponding to the original and entropy-corrected versions of the holographic and new agegraphic dark energy models. We also obtain the equation of state parameters of the corresponding f（T）-gravity models. We conclude that the original holographic and new agegraphic f （T）-gravity models behave like the phantom or quintessence model, whereas in the entropy-corrected models, the equation of state parameter can justify the transition from the quintessence state to the phantom regime as indicated by the recent observations. 展开更多
关键词 modified theories of gravity -- dark energy
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Charged black holes in the infinite derivative theory of gravity 认领 引用
3
作者 Yong Xiao Longting Zhang 《Communications in Theoretical Physics》 SCIE CAS CSCD 2022年第1期77-83,共7页
The infinite derivative theory of gravity is a generalization of Einstein gravity with many interesting properties,but the black hole solutions in this theory are still not fully understood.In the paper,we concentrate... The infinite derivative theory of gravity is a generalization of Einstein gravity with many interesting properties,but the black hole solutions in this theory are still not fully understood.In the paper,we concentrate on studying the charged black holes in such a theory.Adding the electromagnetic field part to the effective action,we show how the black hole solutions around the Reissner-Nordstrom metric can be solved perturbatively and iteratively.We further calculate the corresponding temperature,entropy and electrostatic potential of the black holes and verify the first law of thermodynamics. 展开更多
关键词 quantum aspects of black holes black hole thermodynamics modified theories of gravity
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Adapted Metrics for a Modified Coulomb/Newton’s Potential 认领 引用
4
作者 Lucian M. Ionescu Cristina-Liliana Pripoae Gabriel Pripoae 《Journal of High Energy Physics, Gravitation and Cosmology》 CAS 2023年第4期1311-1355,共45页
Modified Theories of Gravity include spin dependence in General Relativity, to account for additional sources of gravity instead of dark matter/energy approach. The spin-spin interaction is already included in the eff... Modified Theories of Gravity include spin dependence in General Relativity, to account for additional sources of gravity instead of dark matter/energy approach. The spin-spin interaction is already included in the effective nuclear force potential, and theoretical considerations and experimental evidence hint to the hypothesis that Gravity originates from such an interaction, under an averaging process over spin directions. This invites to continue the line of theory initiated by Einstein and Cartan, based on tetrads and spin effects modeled by connections with torsion. As a first step in this direction, the article considers a new modified Coulomb/Newton Law accounting for the spin-spin interaction. The physical potential is geometrized through specific affine connections and specific semi-Riemannian metrics, canonically associated to it, acting on a manifold or at the level of its tangent bundle. Freely falling particles in these “toy Universes” are determined, showing an interesting behavior and unexpected patterns. 展开更多
关键词 Modified Gravity Theory Spin Coulomb’s Law Newton’s Law Modified Coulomb’s Law Nuclear Force Adapted Connection Adapted Metric
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A note on the novel 4D Einstein–Gauss–Bonnet gravity 认领 引用 被引量：3
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作者 Wen-Yuan Ai 《Communications in Theoretical Physics》 SCIE CAS CSCD 2020年第9期89-95,共7页
Recently, a novel 4 D Einstein–Gauss–Bonnet gravity has been proposed by Glavan and Lin(2020 Phys. Rev. Lett. 124 081301) by rescaling the coupling α→α(D-4) and taking the limit D→ 4 at the level of equations of... Recently, a novel 4 D Einstein–Gauss–Bonnet gravity has been proposed by Glavan and Lin(2020 Phys. Rev. Lett. 124 081301) by rescaling the coupling α→α(D-4) and taking the limit D→ 4 at the level of equations of motion. This prescription, though was shown to bring non-trivial effects for some spacetimes with particular symmetries, remains mysterious and calls for scrutiny. Indeed, there is no continuous way to take the limit D→4 in the higher Ddimensional equations of motion because the tensor indices depend on the spacetime dimension and behave discretely. On the other hand, if one works with 4 D spacetime indices the contribution corresponding to the Gauss–Bonnet term vanishes identically in the equations of motion. A necessary condition(but may not be sufficient) for this procedure to work is that there is an embedding of the 4 D spacetime into the higher D-dimensional spacetime so that the equations in the latter can be properly interpreted after taking the limit. In this note, working with2 D Einstein gravity, we show several subtleties when applying the method used in(2020 Phys.Rev. Lett. 124 081301). 展开更多
关键词 Einstein–Gauss–Bonnet gravity modified gravity theories general relativity
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The effects of conical singularity and the Wu-Yang magnetic monopole on the thermodynamic properties of a harmonic oscillator interacting with a potential 认领 引用
6
作者 Faizuddin Ahmed Abdelmalek Bouzenada 《Communications in Theoretical Physics》 SCIE CAS CSCD 2025年第4期73-85,共13页
In this work,we investigate the thermodynamic variables of a harmonic oscillator in a conical geometry metric.Moreover,we introduce an external field in the form of a Wu-Yang magnetic monopole(WYMM)and an inverse squa... In this work,we investigate the thermodynamic variables of a harmonic oscillator in a conical geometry metric.Moreover,we introduce an external field in the form of a Wu-Yang magnetic monopole(WYMM)and an inverse square potential into the system and analyze the results.Using an analytical approach,we obtain the energy level and study the thermodynamics at finite temperature.Our findings demonstrate that thermodynamic variables,except for the specific heat and entropy,are influenced by the topological parameters,the strength of the WYMM,and the inverse square potential. 展开更多
关键词 modified gravity theories non-relativistic wave equations harmonic oscillator solutions of wave equations bound-states magnetic monopoles special functions
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New Yukawa-corrected Casimir wormholes in curvature-matter coupled gravitational framework 认领 引用
7
作者 Saira Waheed 《Communications in Theoretical Physics》 SCIE CAS CSCD 2025年第7期108-132,共25页
In this article, our primary objective is to construct new wormhole solutions by involving a Yukawa-corrected form of Casimir energy density in a well-motivated gravitational theory that allows the coupling of curvatu... In this article, our primary objective is to construct new wormhole solutions by involving a Yukawa-corrected form of Casimir energy density in a well-motivated gravitational theory that allows the coupling of curvature and matter, namely the F(R,T) theory. To achieve this goal, a wormhole geometry exhibiting a spherically-symmetric nature is taken into account and anisotropic fluid is assumed to be the background ordinary matter source.We first consider the simple linear F(R,T) theory by assuming F(R,T) = R+ 2ζ T with L_m=-P(average pressure). Secondly, we utilize the conformal symmetries of the spherical-symmetric geometry for simplifying the resulting field equations and obtain the corresponding analytical form of the wormhole solution. In both cases, the viability of the proposed solutions is examined by checking the basic features of the wormhole shape model along with the validity of null energy constraints. Further, we study the volume integral quantifier(VIQ), exoticity factor and stability through the Tolman–Oppenheimer–Volkov(TOV) equation as well as the adiabatic index, active gravitational mass and complexity factor graphically. Lastly, we use a newly-proposed wormhole shape function to find the expressions of state variables and discuss the validity of energy bounds. We also explore the significance of this wormhole shape model through different quantities graphically. In all scenarios, the presented solutions are found to be new, promising and viable. 展开更多
关键词 modified gravity theories Casimir force Yukawa-corrected Casimir wormholes conformal killing vectors
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Physical aspects of f(R,GμνTμν)modified gravity theories 认领 引用
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作者 Mihai Marciu Dana Maria Ioan 《Chinese Physics C》 SCIE CAS CSCD 2023年第10期237-248,共12页
The paper extends basic Einstein–Hilbert action by incorporating an invariant derived from a specific contraction between the Einstein tensor and energy momentum tensor.This represents a non–minimal coupling between... The paper extends basic Einstein–Hilbert action by incorporating an invariant derived from a specific contraction between the Einstein tensor and energy momentum tensor.This represents a non–minimal coupling between the space–time geometry and matter fields.The fundamental Einstein–Hilbert action is extended by considering a generic function f(R,GμνTμν).This function is subsequently dissected into its primary components:a geometric part reliant on the scalar curvature,and another segment encapsulating the interaction between geometry and matter fields.Distinct cosmological models are formulated at the backdrop of these dynamics,rooted in specific associations between the matter energy-momentum tensor and Einstein tensor.Upon deriving the consequent field equations,the cosmological model's physical implications are explored through a dynamical system analysis applied to diverse coupling functions.This exploration reveals that the current model aligns with various phases in the Universe's evolution,potentially elucidating several late-time historical epochs. 展开更多
关键词 dark energy cosmology modified gravity theories
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Cloud of strings in f(R) gravity 认领 引用 被引量：1
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作者 J.P.Morals Graca Iarley P.Lobo Ines G.Salako 《Chinese Physics C》 SCIE CAS CSCD 2018年第6期44-52,共9页
We derive the solution for a spherically symmetric string cloud configuration in a ＆dimensional spacetime in the framework of f（R） theories of gravity. We also analyze some thermodynamic properties of the joint bla... We derive the solution for a spherically symmetric string cloud configuration in a ＆dimensional spacetime in the framework of f（R） theories of gravity. We also analyze some thermodynamic properties of the joint black hole - cloud of strings solution. For its Hawking temperature, we found that the dependence of the mass with the horizon is significantly different in both theories. For the interaction of a black hole with thermal radiation, we found that the shapes of the curves are similar, but shifted. Our analysis generalizes some known results in the literature. 展开更多
关键词 modified theories of gravity black hole thermodynamics gravitational aspects of string theory
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f(R,L(X))-gravity in the context of dark energy with power law expansion and energy conditions 认领 引用
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作者 Goutam Manna Arijit Panda +2 位作者 Aninda Karmakar Saibal Ray Md.Rabiul Islam 《Chinese Physics C》 SCIE CAS CSCD 2023年第2期190-207,共18页
The objective of this work is to generate a general formalism of f(R,L(X))-gravity in the context of dark energy under the framework of K-essence emergent geometry with the Dirac-Born-Infeld(DBI) variety of action,whe... The objective of this work is to generate a general formalism of f(R,L(X))-gravity in the context of dark energy under the framework of K-essence emergent geometry with the Dirac-Born-Infeld(DBI) variety of action,where R is the familiar Ricci scalar,L(X) is the DBI type non-canonical Lagrangian with X=1/2gμν▽μφ▽νφ,and φ is the K-essence scalar field.The emergent gravity metric(Gμν) and the well known gravitational metric(gμν)are not conformally equivalent.We have constructed a modified field equation using the metric formalism in f(R,L(X))-gravity incorporating the corresponding Friedmann equations into the framework of the background gravitational metric,which is of Friedmann-Lemaitre-Robertson-Walker(FLRW) type.The solution of the modified Friedmann equations have been deduced for the specific choice of f(R,L(X)),which is of Starobinsky-type,using the power law expansion method.The consistency of the model with the accelerating phase of the universe has been shown when we restrict ourselves to consider the value of the dark energy density as φ2=8/9=0.888 <1,which indicates that the present universe is dark-energy dominated.Graphical plots for the energy density(ρ),pressure(p),and equation of state parameter(ω) with respect to(w.r.t.) time(t) based on parametric values are interestingly consistent with the dark energy domination theory,and hence the accelerating features.We also highlight the corresponding energy conditions and constraints of the f(R,L(X)) theory with a basic example. 展开更多
关键词 modified theories of gravity dark energy K-essence model Friedman equations energy conditions
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