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Charged black holes in the infinite derivative theory of gravity

Communications in Theoretical Physics 2022年第1期74卷 77-83页

作者： Yong Xiao Longting Zhang Key Laboratory of High-precision Computation and Application of Quantum Field Theory of Hebei Province College of Physical Science and TechnologyHebei UniversityBaoding 071002China

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 *** the paper,we concentrate on studying the charged black holes in such a *** 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 *** further calculate the corresponding temperature,entropy and electrostatic potential of the black holes and verify the first law of thermodynamics.

关键词： quantum aspects of black holes black hole thermodynamics modified theories of gravity

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Cloud of strings in f(R) gravity

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Chinese Physics C 2018年第6期42卷 44-52页

作者： J.P.Morals Graca Iarley P.Lobo Ines G.Salako Departamento de Fisica Universidade Federal do ParanaCuritibaPRBrazil Departamento de Fisica Universidade Federal da ParafbaCaixa Postal 5008CEP 58051-970Joao PessoaPBBrazil Institut de Mathematiques et de Sciences Physiques(IMSP)01 BP 613 Porto-Novo Benin

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.

关键词： modified theories of gravity black hole thermodynamics gravitational aspects of string theory

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f(■,L(X))-gravity in the context of dark energy with power law expansion and energy conditions

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Chinese Physics C 2023年第2期 194-211页

作者： Goutam Manna Arijit Panda Aninda Karmakar Saibal Ray Md.Rabiul Islam Department of Physics Prabhat Kumar College Department of Physics Raiganj University Centre for Cosmology Astrophysics and Space Science (CCASS) GLA University

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 *** emergent gravity metric(Gμν) and the well known gravitational metric(gμν)are not conformally *** 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) *** 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 *** 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 *** 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 *** also highlight the corresponding energy conditions and constraints of the f(R,L(X)) theory with a basic example.

关键词： modified theories of gravity dark energy K-essence model Friedman equations energy conditions

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f(R,L(X))-gravity in the context of dark energy with power law expansion and energy conditions

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Chinese Physics C 2023年第2期47卷 190-207页

作者： Goutam Manna Arijit Panda Aninda Karmakar Saibal Ray Md.Rabiul Islam Department of Physics Prabhat Kumar CollegeContaiPurba Medinipur 721404India Department of Physics Prabhat Kumar CollegeContaiPurba Medinipur 721404India&Department of PhysicsRaiganj UniversityRaiganjUttar Dinajpur 733134West BengalIndia Department of Physics Prabhat Kumar ColegeContaiPurba Medinipur 721404India Centre for Cosmology Astrophysics and Space Science(CCASS)GLA UniversityMathura 281406Uttar PradeshIndia Department of Physics Raiganj UniversityRaiganjUttar Dinajpur 733134West BengalIndia

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=1/2g^(μν)▽_(μ)φ▽_(ν)φ,and φ is the K-essence scalar *** emergent gravity metric(G_(μν)) and the well known gravitational metric(g^(μν))are not conformally *** 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) *** 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 *** 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 φ^(2)=8/9=0.888 <1,which indicates that the present universe is dark-energy *** 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 *** also highlight the corresponding energy conditions and constraints of the f(R,L(X)) theory with a basic example.

关键词： modified theories of gravity dark energy K-essence model Friedman equations energy conditions

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