Zobrazeno 1 - 10
of 77
pro vyhledávání: '"Ribeiro, Raquel H."'
We introduce the first extension of a Lattice Gas Automaton (LGA) model to accurately replicate observed emergent phenomena in granular materials with a special focus on previously unexplored jamming transitions by incorporating gravitational effects
Externí odkaz:
http://arxiv.org/abs/2309.00165
Autor:
Adil, Arsalan, Albrecht, Andreas, Baunach, Rose, Holman, R., Ribeiro, Raquel H., Richard, Benoit J.
The simplest single-field inflation models capture all the relevant contributions to the patterns in the Cosmic Microwave Background (CMB) observed today. A key assumption in these models is that the quantum inflationary fluctuations that source such
Externí odkaz:
http://arxiv.org/abs/2211.11079
Publikováno v:
In Powder Technology 15 January 2024 433
Autor:
Carrilho, Pedro, Ribeiro, Raquel H.
Publikováno v:
Phys. Rev. D 95, 043516 (2017)
We propose a new technique to study fast transitions during inflation, by studying the dynamics of quantum quenches in an $O(N)$ scalar field theory in de Sitter spacetime. We compute the time evolution of the system using a non-perturbative large-$N
Externí odkaz:
http://arxiv.org/abs/1612.00035
Publikováno v:
JCAP 06 (2016) 033
Attempts to modify gravity in the infrared typically require a screening mechanism to ensure consistency with local tests of gravity. These screening mechanisms fit into three broad classes; we investigate theories which are capable of exhibiting mor
Externí odkaz:
http://arxiv.org/abs/1604.00395
Publikováno v:
Phys.Lett. B748 (2015) 356-360
In de Rham-Gabadadze-Tolley (dRGT) massive gravity and bigravity, a non-minimal matter coupling involving both metrics generically re-introduces the Boulware--Deser (BD) ghost. A non-minimal matter coupling via a simple, yet specific composite metric
Externí odkaz:
http://arxiv.org/abs/1505.02616
Autor:
Fasiello, Matteo, Ribeiro, Raquel H.
Publikováno v:
JCAP07(2015)027
If the amplitude of primordial gravitational waves is measured in the near-future, what could it tell us about bigravity? To address this question, we study massive bigravity theories by focusing on a region in parameter space which is safe from know
Externí odkaz:
http://arxiv.org/abs/1505.00404
Publikováno v:
Phys. Rev. D 90, 124042 (2014)
Recently, several works have investigated the coupling to matter in ghost-free massive (bi-&multi-)gravity and a new effective coupling to matter has been proposed. In this note we clarify some confusion on the existence and the implications of a gho
Externí odkaz:
http://arxiv.org/abs/1409.3834
Publikováno v:
Class. Quantum Grav. 32 (2015) 035022
We investigate the coupling to matter in ghost-free massive (bi-)gravity. When species in the matter sector couple covariantly to only one metric, we show that at one--loop these couplings do not spoil the special structure of the graviton potential.
Externí odkaz:
http://arxiv.org/abs/1408.1678
Autor:
de Rham, Claudia, Ribeiro, Raquel H.
Publikováno v:
JCAP11(2014)016
We investigate the stability of a class of derivative theories known as $P(X)$ and Galileons against corrections generated by quantum effects. We use an exact renormalisation group approach to argue that these theories are stable under quantum correc
Externí odkaz:
http://arxiv.org/abs/1405.5213