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Now showing items 11-20 of 25
Quantum-Gravitational Effects on Primordial Power Spectra in Slow-Roll Inflationary Models
(MDPI, 2018-01-08)
We review the computation of the power spectra of inflationary gauge-invariant perturbations in the context of canonical quantum gravity for generic slow-roll models. A semiclassical approximation, based on an expansion ...
Black hole solutions in mimetic Born-Infeld gravity
(Springer, 2018-01-23)
The vacuum, static, and spherically symmetric solutions in the mimetic Born-Infeld gravity are studied. The mimetic Born-Infeld gravity is a reformulation of the Eddington-inspired-Born-Infeld (EiBI) model under the mimetic ...
An analytic superfield formalism for tree superamplitudes in D=10 and D=11
(Springer, 2018-05-16)
Tree amplitudes of 10D supersymmetric Yang-Mills theory (SYM) and 11D supergravity (SUGRA) are collected in multi-particle counterparts of analytic on-shell superfields. These have essentially the same form as their chiral ...
Pre-Inflation From The Multiverse: Can It Solve The Quadrupole Problem In The Cosmic Microwave Background?
(Springer, 2018-03-21)
We analyze a quantized toy model of a universe undergoing eternal inflation using a quantum-field-theoretical formulation of the Wheeler-DeWitt equation. This so-called third quantization method leads to the picture that ...
Quantum work statistics, Loschmidt echo and information scrambling
(Nature Publishing, 2018-08-22)
A universal relation is established between the quantum work probability distribution of an isolated driven quantum system and the Loschmidt echo dynamics of a two-mode squeezed state. When the initial density matrix is ...
Anisotropic Inflation With Derivative Couplings
(American Physical Society, 2018-05-29)
We study anisotropic power-law inflationary solutions when the inflaton and its derivative couple to a vector field. This type of coupling is motivated by D-brane inflationary models, in which the inflaton, and a vector ...
The Avoidance of the Little Sibling of the Big Rip Abrupt Event by a Quantum Approach
(MDPI, 2018-03)
We address the quantisation of a model that induces the Little Sibling of the Big Rip (LSBR) abrupt event, where the dark energy content is described by means of a phantom-like fluid or a phantom scalar field. The quantisation ...
More on the holographic Ricci dark energy model: smoothing Rips through interaction effects?
(Springer, 2018-04-23)
The background cosmological dynamics of the late Universe is analysed on the framework of a dark energy model described by an holographic Ricci dark energy component. Several kind of interactions between the dark energy ...
f (R) Gravity Modifications: From The Action To The Data
(Springer, 2018-03-13)
It is a very well established matter nowadays that many modified gravity models can offer a sound alternative to General Relativity for the description of the accelerated expansion of the universe. But it is also equally ...
Forecast And Analysis Of The Cosmological Redshift Drift
(Springer, 2018-01-08)
The cosmological redshift drift could lead to the next step in high-precision cosmic geometric observations, becoming a direct and irrefutable test for cosmic acceleration. In order to test the viability and possible ...