Zobrazeno 1 - 10
of 374
pro vyhledávání: '"BERTOLAMI, ORFEU"'
Theoretical predictions from a modified theory of gravity with a nonminimal coupling between matter and curvature are compared to data from recent cosmological surveys. We use type Ia supernovae data from the Pantheon+ sample and the recent 5-year Da
Externí odkaz:
http://arxiv.org/abs/2412.09348
Autor:
Bernardini, Alex E., Bertolami, Orfeu
Extending the phase-space description of the Weyl-Wigner quantum mechanics to a subset of non-linear Hamiltonians in position and momentum, gaussian functions are identified as the quantum ground state. Once a Hamiltonian, $H^{W}(q,\,p)$, is constrai
Externí odkaz:
http://arxiv.org/abs/2409.16377
The properties of metric perturbations are determined in the context of an expanding Universe governed by a modified theory of gravity with a non-minimal coupling between curvature and matter. We analyse the dynamics of the 6 components of a general
Externí odkaz:
http://arxiv.org/abs/2409.07625
Autor:
Bernardini, Alex E., Bertolami, Orfeu
The extension of the phase-space Weyl-Wigner quantum mechanics to the subset of Hamiltonians in the form of $H(q,\,p) = {K}(p) + {V}(q)$ (with $K(p)$ replacing single $p^2$ contributions) is revisited. Deviations from classical and stationary profile
Externí odkaz:
http://arxiv.org/abs/2409.04291
Autor:
Mantziris, Andreas, Bertolami, Orfeu
The study of interactions between dark matter and the Higgs field opens an exciting connection between cosmology and particle physics, since such scenarios can impact the features of dark matter as well as interfering with the spontaneous breaking of
Externí odkaz:
http://arxiv.org/abs/2407.18845
Publikováno v:
JCAP 06 (2024) 025
The presently open problem of the Hubble tension is shown to be removed in the context of a modified theory of gravity with a non-minimal coupling between curvature and matter. By evolving the cosmological parameters that match the cosmic microwave b
Externí odkaz:
http://arxiv.org/abs/2403.11683
Publikováno v:
Universe 2024, 10(7), 271
In this work, we discuss the de Sitter swampland conjectures in the context of the generalized Chaplygin-inspired inflationary model. We demonstrate that these conjectures can be satisfied, but only in the region of the parameter space far away from
Externí odkaz:
http://arxiv.org/abs/2402.19051
Autor:
Bertolami, Orfeu, Bernardini, A. E.
We argue that time crystal properties naturally arise from phase-space noncommutative quantum mechanics. In order to exemplify our point we consider the 2-dimensional noncommutative quantum harmonic oscillator and show that it exibihits periodic osci
Externí odkaz:
http://arxiv.org/abs/2402.18238
We analyze the dynamics of the Sun-Earth-Moon system in the context of a particular class of theories of gravity where curvature and matter are nonminimally coupled (NMC). These theories can potentially violate the Equivalence Principle as they give
Externí odkaz:
http://arxiv.org/abs/2312.14618
Autor:
Bertolami, Orfeu
It is proposed that the vacuum admits two different phases as described by the Chaplygin equation of state or its generalised version: a phase where the energy density behaves as if dominated by non-relativistic matter and a de Sitter phase. The part
Externí odkaz:
http://arxiv.org/abs/2305.08259