Zobrazeno 1 - 10
of 74
pro vyhledávání: '"Sheikhahmadi, Haidar"'
Autor:
Sobouti, Yousef, Sheikhahmadi, Haidar
Singularities in Newton's gravitation, in general relativity (GR), in Coulomb's law, and elsewhere in classical physics, stem from two ill conceived assumptions: a) there are point-like entities with finite masses, charges, etc., packed in zero volum
Externí odkaz:
http://arxiv.org/abs/2404.18954
Publikováno v:
Phys. Rev. D 109, 125005, 2024
We consider self-interacting scalar fields with a conformal coupling in the dS background and study the quantum corrections from bubble loop diagrams. Incorporating the perturbative in-in formalism, we calculate the quantum corrections in the vacuum
Externí odkaz:
http://arxiv.org/abs/2403.10463
Autor:
Sheikhahmadi, Haidar
A recent research presented a solution for a Schwarzschild black hole with a force-free magnetic field showing how the canonical form of background metric changes, Found. Phys. 52 (2022) 4, 93. Therefore, it is logical that this research seeks modifi
Externí odkaz:
http://arxiv.org/abs/2310.20531
Publikováno v:
Phys. Rev. D 108, 065002, 2023
We study the vacuum zero point energy associated to a scalar field with an arbitrary mass and conformal coupling in a dS background. Employing dimensional regularization scheme, we calculate the regularized zero point energy density, pressure and the
Externí odkaz:
http://arxiv.org/abs/2307.00977
Publikováno v:
Eur. Phys. J. C (2023) 83: 814
The astrophysical consequences of the presence of a quintessence scalar field on the evolution of the horizon and on the accretion disk surrounding a static black hole, in the Scalar-Vector-Tensor version of Modified Gravity (MOG), are investigated.
Externí odkaz:
http://arxiv.org/abs/2303.02194
Autor:
Sheikhahmadi, Haidar
Publikováno v:
Foundations of Physics 52, 93 (2022)
We envisage a black hole perturbed by a force-free magnetic field (FFMF) outside and attempt to determine its structure. We suppose the metric that describes this black hole is of the static spherical type, that is Schwarzschild, and the energy-momen
Externí odkaz:
http://arxiv.org/abs/2111.08682
Autor:
Sheikhahmadi, Haidar
Publikováno v:
Modern Physics Letters A, Vol. 37, No. 33n34, 2250231 (2022)
In this work, we reexamine the holographic dark energy concept proposed already for cosmological applications. By considering, more precisely, the bounds on the entropy arising from lattice field theory on one side and Bekenstein-Hawking entropy of b
Externí odkaz:
http://arxiv.org/abs/2109.15022
Publikováno v:
Eur. Phys. J. Plus 136, 1223 (2021)
A version of massive gravity, namely conformal massive gravity, is employed to study the behavior of thermodynamic geometry for both the static and the rotating regular black holes. Whereas in thermodynamic geometry singularity can be interpreted as
Externí odkaz:
http://arxiv.org/abs/2109.03176
Autor:
Harko, Tiberiu, Sheikhahmadi, Haidar
Publikováno v:
Eur. Phys. J. C (2021) 81: 165
We consider a warm inflationary scenario in which the two dominant matter components present in the early Universe, the scalar field, and the radiation fluid, evolve with different four-velocities. This cosmological system is mathematically equivalen
Externí odkaz:
http://arxiv.org/abs/2102.04728
Autor:
Sheikhahmadi, Haidar, Faizal, Mir, Aghamohammadi, Ali, Soroushfar, Saheb, Bahamonde, Sebastian
Publikováno v:
Nucl. Phys. B 961, 115252 (2020)
In this paper, we analyze the inflationary cosmology using string field theory. This is done by using the zero level contribution from string field theory, which is a non-local tachyonic action. We will use the non-local Friedmann equations for this
Externí odkaz:
http://arxiv.org/abs/2005.07956