output
19982026
most citedHorizon-scale tests of gravity theories and fundamental physics from the Event Horizon Telescope image of Sagittarius A

753 citations

Showing 2023 · gr-qcShow all

13 papers · 2 filters

gr-qc2023★ 25 cited

Effect of rainbow function on the structural properties of dark energy star

A. Bagheri Tudeshki, G. H. Bordbar, B. Eslam Panah

Confirming the existence of compact objects with a mass greater than by observational results such as GW190814 makes that is possible to provide theories to justify…

gr-qc2023★ 6 cited

Modified cosmology through Kaniadakis entropy

Mahdi Kord Zangeneh, Ahmad Sheykhi

We explore a cosmological model inspired by the modified Kaniadakis entropy and disclose the influences of the modified Friedmann equations on the evolution of the Universe. We fin…

gr-qc2023★ 4 cited

Structure of gravastars in the context of massive gravity

H. Barzegar, B. Eslam Panah, G. H. Bordbar +1

In this paper, we investigate a new model of dimensional () gravitational vacuum stars (gravastars) with an isotropic matter distribution anti-de Sitter (AdS) spacetime…

gr-qc2023★ 7 cited

Three-dimensional accelerating AdS black holes in gravity

B. Eslam Panah, M. Khorasani, J. Sedaghat

Considering a three-dimensional metric, we obtain the exact accelerating black holes in the theory of gravity coupled with and without a matter field. First, we extract…

gr-qc2023★ 21 cited

Kerr-Newman Black Holes in Weyl-Cartan Theory: Shadows and EHT constraints

Khadije Jafarzade, Seyed Hossein Hendi, Mubasher Jamil +1

With the recent release of the black hole image of Sgr A* alongside the earlier image of M87*, one can achieve an in-depth understanding of gravitational physics at the horizon sca…

gr-qc2023★ 41 cited

Slow-roll inflation and growth of perturbations in Kaniadakis modification of Friedmann cosmology

Gaetano Lambiase, Giuseppe Gaetano Luciano, Ahmad Sheykhi

Kaniadakis entropy is a one-parameter deformation of the classical Boltzmann-Gibbs-Shannon entropy, arising from a self-consistent relativistic statistical theory. Assuming a Kania…

gr-qc2023

Noether gauge symmetry approach applying for the non-minimally coupled gravity to the Maxwell field

S. Mahmoudi, S. Hajkhalili, S. H. Hendi

Taking the Noether gauge symmetry approach into account, we find spherically symmetric static black hole solutions of the non-minimal gauge-gravity Lagrangian of the $\mathcal{R}^β…

gr-qc2023★ 17 cited

Note on agegraphic dark energy inspired by modified Barrow entropy

A. Sheykhi, S. Ghaffari

We revisit agegraphic dark energy (ADE) model when the entropy associated with the apparent horizon is in the form of Barrow entropy, , where indicat…

gr-qc2023★ 14 cited

Apparent dark matter as a non-local manifestation of emergent gravity

Kimet Jusufi, Ahmad Sheykhi, Salvatore Capozziello

We disclose a close correspondence between Verlinde's Emergent Gravity (VEG) theory and the non-local gravity theories. Such non-local effects can play crucial role at small distan…

gr-qc2023★ 24 cited

Effect of massive graviton on dark energy star structure

A. Bagheri Tudeshki, G. H. Bordbar, B. Eslam Panah

The presence of massive gravitons in the field of massive gravity is considered as an important factor in investigating the structure of compact objects. Hence, we are encouraged t…

gr-qc2023★ 23 cited

Stable three-dimensional (un)charged AdS gravastars in gravity's rainbow

H. Barzegar, M. Bigdeli, G. H. Bordbar +1

In this work, we study the three-dimensional AdS gravitational vacuum stars (gravastars) in the context of gravity's rainbow theory. Then we extend it by adding the Maxwell electro…

gr-qc2023★ 36 cited

Corrections to Friedmann equations inspired by Kaniadakis entropy

Ahmad Sheykhi

Adopting the thermodynamics-gravity conjecture, and assuming the entropy associated with the apparent horizon of the Friedmann-Robertson-Walker (FRW) universe has the form of the g…

gr-qc2023★ 34 cited

Hubble tension as a guide for refining the early Universe: Cosmologies with explicit local Lorentz and diffeomorphism violation

Mohsen Khodadi, Marco Schreck

This paper is dedicated to assessing modified cosmological settings based on the gravitational Standard-Model Extension (SME). Our analysis rests upon the Hubble tension (HT), whic…