Zobrazeno 1 - 10
of 61
pro vyhledávání: '"David Benisty"'
Autor:
David Benisty
Publikováno v:
Nuclear Physics B, Vol 992, Iss , Pp 116251- (2023)
A formulation of cosmology driven by fermions ψ is studied. Assumption that the expectation value of the fermion bilinear is non-zero simplifies the homogeneous solution of the Dirac equations and connects the spinor field with the scale parameter o
Externí odkaz:
https://doaj.org/article/f73679b9ebbb4807b785f135613bb9db
Publikováno v:
The Astrophysical Journal Letters, Vol 953, Iss 1, p L2 (2023)
This Letter develops a method to constrain the cosmological constant Λ from binary galaxies, focusing on the Milky Way and Andromeda galaxies. We provide an analytical solution to the two-body problem with Λ and show that the ratio between the Kepl
Externí odkaz:
https://doaj.org/article/83f0adfd73704250bebacce1c3521ade
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 81, Iss 2, Pp 1-9 (2021)
Abstract Constraints on the Covariant Canonical Gauge Gravity (CCGG) theory from low-redshift cosmology are studied. The formulation extends Einstein’s theory of General Relativity (GR) by a quadratic Riemann–Cartan term in the Lagrangian, contro
Externí odkaz:
https://doaj.org/article/ac583cdb2c8a405cac77bb11d151261a
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 80, Iss 5, Pp 1-8 (2020)
Abstract We propose a new approach to investigate inflation in a model-independent way, and in particular to elaborate the involved observables, through the introduction of the “scale factor potential”. Through its use one can immediately determi
Externí odkaz:
https://doaj.org/article/d65a35817a494540b86f9650f3f5fb0d
Publikováno v:
Symmetry, Vol 13, Iss 11, p 2108 (2021)
The early cosmology, driven by a single scalar field, both massless and massive, in the context of Eddington-inspired Born-Infeld gravity, is explored. We show the existence of nonsingular solutions of bouncing and loitering type (depending on the si
Externí odkaz:
https://doaj.org/article/b042371c837b48ed93ca04533d26ddc0
Autor:
David Benisty, E. I. Guendelman
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 77, Iss 6, Pp 1-10 (2017)
Abstract Here we generalize ideas of unified dark matter–dark energy in the context of two measure theories and of dynamical space time theories. In two measure theories one uses metric independent volume elements and this allows one to construct u
Externí odkaz:
https://doaj.org/article/f6072b632cc14c9f95b9d6c567f9a749
Publikováno v:
Symmetry, Vol 12, Iss 5, p 734 (2020)
First, we propose a scale-invariant modified gravity interacting with a neutral scalar inflaton and a Higgs-like S U ( 2 ) × U ( 1 ) iso-doublet scalar field based on the formalism of non-Riemannian (metric-independent) spacetime
Externí odkaz:
https://doaj.org/article/1df6497dfbfd41d493d60c02f19d9024
Publikováno v:
Symmetry, Vol 12, Iss 3, p 481 (2020)
Our primary objective is to construct a plausible, unified model of inflation, dark energy and dark matter from a fundamental Lagrangian action first principle, wherein all fundamental ingredients are systematically dynamically generated starting fro
Externí odkaz:
https://doaj.org/article/bd2749bd126448f9aa35244592ec2cb3
Publikováno v:
Universe, Vol 4, Iss 11, p 112 (2018)
A spherically symmetric space-time solution for a diffusive two measures theory is studied. An asymmetric wormhole geometry is obtained where the metric coefficients has a linear term for galactic distances and the analysis of Mannheim and collaborat
Externí odkaz:
https://doaj.org/article/f298677dc2564aaf9a6c6e3a2178ae09
Autor:
David Benisty
Publikováno v:
The Sixteenth Marcel Grossmann Meeting.