Zobrazeno 1 - 10
of 291
pro vyhledávání: '"Awad, Adel"'
Publikováno v:
Phys. Rev. D 109, 084026 (2024)
We study phase structures of Lorentzian Dyonic Taub-NUT-AdS spacetimes for different horizon geometries, which are spherical, flat, and hyperbolic. We check the consistency of our extended thermodynamics approach through satisfying the first law, the
Externí odkaz:
http://arxiv.org/abs/2312.15811
Autor:
Hanafy, Waleed El, Awad, Adel
Publikováno v:
The Astrophysical Journal, 951:144 (10pp), 2023
It has been shown that the nonminimal coupling between geometry and matter can provide models for massive compact stars that are consistent with the conformal bound on the sound speed, $0\leqslant {c}_{s}^{2}\leqslant {c}^{2}/3$, where the core densi
Externí odkaz:
http://arxiv.org/abs/2305.14953
Autor:
Awad, Adel, Elkhateeb, Esraa
Publikováno v:
Phys. Rev. D 108, 064023 (2023)
Here we extend the approach developed in \cite{adel_2} to study the thermodynamics of Taub-NUT-AdS and dyonic Taub-NUT-AdS solutions. Furthermore, we investigate in details the possible phase structures of the dyonic Taub-NUT-AdS solution. We show th
Externí odkaz:
http://arxiv.org/abs/2304.06705
Publikováno v:
Phys. Rev. D 107, 035023 (2023)
We propose a modification to the standard hybrid inflation model \cite{Linde:1993cn}, that connects a successful hybrid inflation scenario to the standard model Higgs sector, via the electroweak vacuum stability. The proposed model results in an effe
Externí odkaz:
http://arxiv.org/abs/2210.03247
Autor:
Awad, Adel, ElSayed, Hassan
We show that the calculation of the thermodynamic volume in the bulk theory is sensitive to conformal anomalies in the dual CFT, and present a new way of calculating it when the conformal anomalies do not vanish. This solves the issue where the use o
Externí odkaz:
http://arxiv.org/abs/2209.09031
Publikováno v:
Eur. Phys. J. C (2022) 82:972
We study various forms of diagonal tetrads that accommodate Black Hole solutions in $f(T)$ gravity with certain symmetries. As is well-known, vacuum spherically symmetric diagonal tetrads lead to rather boring cases of constant torsion scalars. We ex
Externí odkaz:
http://arxiv.org/abs/2207.00059
Autor:
Awad, Adel, Eissa, Somaya
Publikováno v:
Phys. Rev. D 105, 124034 (2022)
Motivated by recent activities in Lorentzian Taub-NUT space thermodynamics, we calculate conserved charges of these spacetimes. We find additional mass, nut, angular momentum, electric and magnetic charge densities distributed along Misner string. Th
Externí odkaz:
http://arxiv.org/abs/2206.09124
Autor:
Awad, Adel, Eissa, Somaya
Publikováno v:
Phys. Rev. D 101, 124011 (2020)
Motivated by the absence of Misner string in the Euclidean Taub-Bolt/NUT solutions with flat horizons, we present a new treatment for studying the thermodynamics of these spactimes. This treatment is based on introducing a new charge, $N=\sigma \, n$
Externí odkaz:
http://arxiv.org/abs/2007.10489
Publikováno v:
Eur. Phys. J. C (2020) 80: 868
Using the dynamical system theory we show that the Friedmann-Robertson-Walker (FRW) cosmological model with bulk viscous fluid in the presence of cosmological constant is equivalent to a degenerate two dimensional Bogdanov-Takens normal form. The equ
Externí odkaz:
http://arxiv.org/abs/2001.04981
Publikováno v:
Phys. Rev. D 101, 044058 (2020)
We analyze the early-time isotropic cosmology in the so-called energy-momentum-squared gravity (EMSG). In this theory, a $T_{\mu\nu}T^{\mu\nu}$ term is added to the Einstein-Hilbert action, which has been shown to replace the initial singularity by a
Externí odkaz:
http://arxiv.org/abs/1911.00556