Zobrazeno 1 - 10
of 49
pro vyhledávání: '"Ali H"'
Publikováno v:
Advances in Mathematical Physics, Vol 2021 (2021)
In the present paper, we investigate the nature of Ricci-Yamabe soliton on an imperfect fluid generalized Robertson-Walker spacetime with a torse-forming vector field ξ . Furthermore, if the potential vector field ξ of the Ricci-Yamabe soliton is o
The recently proposed theory of "Asymptotically Free Mimetic Gravity" is extended to the general non-homogeneous, spatially non-flat case. We present a modified theory of gravity which is free of higher derivatives of the metric. In this theory asymp
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c94a788b6a05b390b9a53fd5baa0d612
http://arxiv.org/abs/1912.03162
http://arxiv.org/abs/1912.03162
Publikováno v:
Journal of High Energy Physics
Journal of High Energy Physics, Vol 2019, Iss 10, Pp 1-9 (2019)
Journal of High Energy Physics, Vol 2019, Iss 10, Pp 1-9 (2019)
We show that in asymptotically free mimetic gravity with limiting curvature the black hole singularity can be resolved and replaced by a static patch of de Sitter space. As a result of Hawking evaporation of these non-singular black holes, there rema
Publikováno v:
Physics Letters
Physics Letters B, Vol 798, Iss, Pp-(2019)
Physics Letters B, Vol 798, Iss, Pp-(2019)
We show that the scalar field of mimetic gravity could be used to construct diffeomorphism invariant models that reduce to Horava gravity in the synchronous gauge. The gradient of the mimetic field provides a timelike unit vector field that allows to
Publikováno v:
Results in Physics, Vol 29, Iss, Pp 104712-(2021)
This paper aims to formulate exact solutions of anisotropic gravitating source with the cosmological constant in ( n + 2 ) dimensional spacetime, which may lead to collapse or expansion. We have considered the expansion scalar to be negative and posi
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 79, Iss 7, Pp 1-6 (2019)
European Physical Journal C, 79, 1-6
European Physical Journal
European Physical Journal C, 79, 7, pp. 1-6
European Physical Journal C, 79, 1-6
European Physical Journal
European Physical Journal C, 79, 7, pp. 1-6
The idea of "asymptotically free" gravity is implemented using a constrained mimetic scalar field. The effective gravitational constant is assumed to vanish at some limiting curvature. As a result singularities in contracting spatially flat Friedmann
The charged Nariai spacetimes are the exact solutions of Einstein-Maxwell field equations with positive cosmological constant and such a spacetime is the direct topological product of a $2$-dimentional de-Sitter spacetime with a round $2$-sphere of c
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d5a416d7007d01005beaae5a04e053e2
Publikováno v:
JHEP
JHEP, 2018, 06, pp.060. ⟨10.1007/JHEP06(2018)060⟩
Journal of High Energy Physics, Vol 2018, Iss 6, Pp 1-7 (2018)
JHEP, 2018, 06, pp.060. 〈10.1007/JHEP06(2018)060〉
Journal of High Energy Physics
Journal of High Energy Physics, Springer, 2018, 06, pp.060. ⟨10.1007/JHEP06(2018)060⟩
JHEP, 2018, 06, pp.060. ⟨10.1007/JHEP06(2018)060⟩
Journal of High Energy Physics, Vol 2018, Iss 6, Pp 1-7 (2018)
JHEP, 2018, 06, pp.060. 〈10.1007/JHEP06(2018)060〉
Journal of High Energy Physics
Journal of High Energy Physics, Springer, 2018, 06, pp.060. ⟨10.1007/JHEP06(2018)060⟩
The mass of the graviton can be generated using a Brout-Englert-Higgs mechanism with four scalar fields. We show that when one of these fields is costrained as in mimetic gravity, the massive gravity obtained is ghost free and consistent. The mass te
Autor:
Ali H. Chamseddine, Hermann Nicolai
Publikováno v:
Physics Letters
Due to renewed interest in D=5 supergravity and its quartic fermionic terms, fuelled by very recent work on supersymmetric quantum cosmology we correct an error in eq.(4) of the paper cited in the title. We also give the Lagrangian in second order fo
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::52d32f5c97236bc663cefab35bd05e9e
Publikováno v:
JHEP
JHEP, 2018, 06, pp.062. ⟨10.1007/JHEP06(2018)062⟩
Journal of High Energy Physics
Journal of High Energy Physics, Springer, 2018, 06, pp.062. ⟨10.1007/JHEP06(2018)062⟩
Journal of High Energy Physics, Vol 2018, Iss 6, Pp 1-20 (2018)
JHEP, 2018, 06, pp.062. ⟨10.1007/JHEP06(2018)062⟩
Journal of High Energy Physics
Journal of High Energy Physics, Springer, 2018, 06, pp.062. ⟨10.1007/JHEP06(2018)062⟩
Journal of High Energy Physics, Vol 2018, Iss 6, Pp 1-20 (2018)
We present a theory of ghost-free massive gravity where the mass of the graviton is generated through the Brout-Englert-Higgs (BEH) mechanism and one of the four scalar fields used is that of mimetic gravity. The mass term is not of the Fierz-Pauli t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ea4d0ccd21730fc3b60344c6d71f78c2
https://hal.archives-ouvertes.fr/hal-01801934
https://hal.archives-ouvertes.fr/hal-01801934