Zobrazeno 1 - 10
of 76
pro vyhledávání: '"Fronimos, F. P."'
Publikováno v:
Symmetry 15 (2023) 9, 1701
We review recent trends on inflationary dynamics in the context of viable modified gravity theories. After providing a general overview of the inflationary paradigm emphasizing on what problems of hot Big Bang theory inflation solves, and a somewhat
Externí odkaz:
http://arxiv.org/abs/2307.16308
Publikováno v:
Phys.Rev.D 107 (2023) 08, 084007
In this article we present an alternative formalism for the inflationary phenomenology of rescaled Einstein-Gauss-Bonnet models which are in agreement with the GW170817 event. By constraining the propagation velocity of primordial tensor perturbation
Externí odkaz:
http://arxiv.org/abs/2303.14594
Publikováno v:
Phys.Dark Univ. 40 (2023) 101186
Under the main assumption that the axion scalar field mainly composes the dark matter in the Universe, in this paper we shall extend the formalism of kinetic axion $R^2$ gravity to include Gauss-Bonnet terms non-minimally coupled to the axion field.
Externí odkaz:
http://arxiv.org/abs/2302.07147
Autor:
Fronimos, F. P., Venikoudis, S. A.
In this work we investigate the inflationary era in the presence of a canonical scalar field and Chern-Simons parity violating corrections. It was also assumed that a non minimal coupling between curvature and the scalar field is present. For the sha
Externí odkaz:
http://arxiv.org/abs/2302.05173
In this work we examine the Swampland criteria for a specific class of rescaled $f(R)$ gravitational models, that are capable of unifying the primordial era of the Universe with the late-time era with the inclusion of string corrections. In particula
Externí odkaz:
http://arxiv.org/abs/2301.08126
Autor:
Venikoudis, S. A., Fronimos, F. P.
In the present article we showcase how the reheating era can be described properly in the context of Einstein-Gauss-Bonnet gravity assuming that the primordial gravitational waves propagate with the velocity of light. The equations of the duration of
Externí odkaz:
http://arxiv.org/abs/2208.08333
In this work we present the late-time behaviour of the Universe in the context of Einstein-Gauss-Bonnet gravitational theory. The theory involves a scalar field, which represents low-effective quantum corrections, assisted by a function $f(\mathcal{G
Externí odkaz:
http://arxiv.org/abs/2201.13146
Autor:
Di Piazza, A., Fronimos, F. P.
Publikováno v:
Phys. Rev. D, vol. 105, 116019 (2022)
The solution of the Dirac equation in the presence of an arbitrary plane wave, corresponding to the so-called Volkov states, has provided an enormous insight in strong-field QED. In [Phys. Rev. A \textbf{103}, 076011 (2021)] a new "fully quasiclassic
Externí odkaz:
http://arxiv.org/abs/2201.08101
Autor:
Fronimos, F. P., Venikoudis, S. A.
An alternative scenario about the phenomenology of primordial Universe is k-inflation. According to this concept, inflation can be achieved by nonstandard kinetic term of scalar field, namely the inflaton. In this project we focus on k-essence models
Externí odkaz:
http://arxiv.org/abs/2110.12457
In this work we shall develop a quantitative approach for extracting predictions on the primordial gravitational waves energy spectrum for $f(R)$ gravity. We shall consider two distinct models which yield different phenomenology, one pure $f(R)$ grav
Externí odkaz:
http://arxiv.org/abs/2108.11231