نتایج جستجو برای: f r gravity

تعداد نتایج: 742294  

Journal: :Bulletin of Taras Shevchenko National University of Kyiv. Astronomy 2020

Journal: :Physics Letters B 2018

Journal: :International Journal of Modern Physics D 2021

In this work, we studied the traversable wormholes geometry in [Formula: see text] theory gravity, where is Ricci scalar. The wormhole solutions for some assumed functions are presented. assumption of based on fact that its behavior changed with an parameter rather than deceleration parameter. Three models presented physically motivated shape function and their behaviors studied.

Journal: :European Physical Journal C 2023

Abstract Inspired by the Maxwell symmetry generalization of general relativity (Maxwell gravity), we have constructed extension f ( R ) gravity. We found that semi-simple Poincare allows us to introduce geometrically a cosmological constant term in four-dimensional This also introduction non-vanishing torsion theory. It is antisymmetric gauge field $$B^{ab}$$ <mml:math xmlns:mml="http://www.w3....

Journal: :Classical and Quantum Gravity 2008

Journal: :Physical Review D 2008

Journal: :Physics Letters B 2022

In this letter, we investigate the cosmic expansion scenario of universe in framework $f(R,L_m)$ gravity theory. We consider a non-linear model, specifically, $f(R,L_m)=\frac{R}{2}+L_m^n + \beta$, where $n$ and $\beta$ are free model parameters. Then derive motion equations for flat FLRW obtain exact solution corresponding field equations. estimate best fit ranges parameters by using updated $H...

Journal: :European Physical Journal C 2023

Abstract The present cosmological model deals with modified f ( R , T ) gravity theory $$f(R,T)=R+h(T)$$ f ( R , T ) = + h in the background of homogen...

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