Zobrazeno 1 - 10
of 164
pro vyhledávání: '"Ali H. Chamseddine"'
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 84, Iss 3, Pp 1-6 (2024)
Abstract We study the metric corresponding to a three-dimensional coset space SO(4)/SO(3) in the lattice setting. With the use of three integers $$n_1, n_2$$ n 1 , n 2 , and $$n_3$$ n 3 , and a length scale, $$l_{\mu }$$ l μ , the continuous metric
Externí odkaz:
https://doaj.org/article/9630a4a90d544d289c5b04fee871e2b8
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 83, Iss 10, Pp 1-10 (2023)
Abstract We study numerically the curvature tensor in a three-dimensional discrete space. Starting from the continuous metric of a three-sphere, we transformed it into a discrete space using three integers $$n_1, n_2$$ n 1 , n 2 , and $$n_3$$ n 3 . T
Externí odkaz:
https://doaj.org/article/43b0cc47e7c244f88c2aba5e60069ff3
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 82, Iss 7, Pp 1-6 (2022)
Abstract We focus on studying, numerically, the scalar curvature tensor in a two-dimensional discrete space. The continuous metric of a two-sphere is transformed into that of a lattice using two possible slicings. In the first, we use two integers, w
Externí odkaz:
https://doaj.org/article/523c6a0b73ec4bdd9526e1274ddf89ca
Autor:
Ali H. Chamseddine
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 81, Iss 11, Pp 1-8 (2021)
Abstract We formulate a supersymmetric version of gravity with mimetic dark matter. The coupling of a constrained chiral multiplet to $$N = 1$$ N = 1 supergravity is made locally supersymmetric using the rules of tensor calculus. The chiral multiplet
Externí odkaz:
https://doaj.org/article/bc8234d429a24973ad0e61e1e5708c15
Publikováno v:
Journal of High Energy Physics, Vol 2021, Iss 11, Pp 1-13 (2021)
Abstract We assume that the points in volumes smaller than an elementary volume (which may have a Planck size) are indistinguishable in any physical experiment. This naturally leads to a picture of a discrete space with a finite number of degrees of
Externí odkaz:
https://doaj.org/article/5b6b35aa8ef446daa36ea8f76ed9cb6e
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 80, Iss 11, Pp 1-7 (2020)
Abstract Quantization of the noncommutative geometric spectral action has so far been performed on the final component form of the action where all traces over the Dirac matrices and symmetry algebra are carried out. In this work, in order to preserv
Externí odkaz:
https://doaj.org/article/1c530b127ec5411fa1d92e6c110f5030
Publikováno v:
Journal of High Energy Physics, Vol 2019, Iss 10, Pp 1-9 (2019)
Abstract 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, t
Externí odkaz:
https://doaj.org/article/fa449cc020524b2e83a530d61f27fe7b
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 79, Iss 7, Pp 1-6 (2019)
Abstract 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 spatially flat Friedman
Externí odkaz:
https://doaj.org/article/01d11a840ed74182b5a5baeb4ef13e42
Publikováno v:
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 Hořava gravity in the synchronous gauge. The gradient of the mimetic field provides a timelike unit vector field that allows t
Externí odkaz:
https://doaj.org/article/80ce6bfd92d54530b7263bbd7eea62ba
Publikováno v:
Journal of High Energy Physics, Vol 2018, Iss 6, Pp 1-20 (2018)
Abstract 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 Fier
Externí odkaz:
https://doaj.org/article/c82fa270d65842adaec9b1194e81d3fc