Zobrazeno 1 - 10
of 31
pro vyhledávání: '"Joras, S. E."'
Autor:
Peralta, C. D., Jorás, S. E.
In this work we further extend the analysis of $f(R)$ theories of gravity in the metric formalism under the approach of a Thermodynamics analogy, proposed in arXiv:1911.04830v3. Here we assume a double-well inflationary potential in the Einstein fram
Externí odkaz:
http://arxiv.org/abs/2306.10252
Autor:
Peralta, C. D., Jorás, S. E.
This paper starts from a toy model for inflation in a class of modified theories of gravity in the metric formalism. Instead of the standard procedure -- assuming a non-linear Lagrangian $f(R)$ in the Jordan frame -- we start from a simple $\phi^2$ p
Externí odkaz:
http://arxiv.org/abs/1911.04830
Understanding the influence of dark energy on the formation of structures is currently a major challenge in Cosmology, since it can distinguish otherwise degenerated viable models. In this work we consider the Top-Hat Spherical-Collapse (SC) model wi
Externí odkaz:
http://arxiv.org/abs/1906.04326
Publikováno v:
Phys. Rev. D 95, 064029 (2017)
Critical overdensity $\delta_c$ is a key concept in estimating the number count of halos for different redshift and halo-mass bins, and therefore, it is a powerful tool to compare cosmological models to observations. There are currently two different
Externí odkaz:
http://arxiv.org/abs/1703.05824
Publikováno v:
Phys. Rev. D 90, 025019 (2014)
We compute the partition function and specific heat for a quantum mechanical particle under the influence of a quartic double-well potential non-perturbatively, using the semiclassical method. Near the region of bounded motion in the inverted potenti
Externí odkaz:
http://arxiv.org/abs/1311.1182
We investigate a simple generalization of the metric exponential $f(R)$ gravity theory that is cosmologically viable and compatible with solar system tests of gravity. We show that, as compared to other viable $f(R)$ theories, its steep dependence on
Externí odkaz:
http://arxiv.org/abs/1305.4654
By using the Sloan Digital Sky Survey (SDSS) first year type Ia supernova (SN Ia) compilation, we compare two different approaches (traditional \chi^2 and complete likelihood) to determine parameter constraints when the magnitude dispersion is to be
Externí odkaz:
http://arxiv.org/abs/1104.2874
Publikováno v:
Phys.Rev.D81:083531,2010
In this work we study the dynamics of the axisymmetric Bianchi IX cosmological model with a term of quantum potential added. As it is well known this class of Bianchi IX models are homogeneous and anisotropic with two scale factors, $A(t)$ and $B(t)$
Externí odkaz:
http://arxiv.org/abs/1005.3273
Autor:
Joras, S. E., Marozzi, G.
Publikováno v:
Phys.Rev.D79:023514,2009
We study a particular nonlinear dispersion relation $\omega_p(k_p)$ -- a series expansion in the physical wavenumber $k_p$ -- for modeling first-order corrections in the equation of motion of a test scalar field in a de Sitter spacetime from trans-Pl
Externí odkaz:
http://arxiv.org/abs/0808.1262
Autor:
Jorás, S. E., Stuchi, T. J.
Publikováno v:
Phys.Rev. D68 (2003) 123525
In this work we study the existence of mechanisms of transition to global chaos in a closed Friedmann-Robertson-Walker universe with a massive conformally coupled scalar field. We propose a complexification of the radius of the universe so that the g
Externí odkaz:
http://arxiv.org/abs/gr-qc/0307044