Zobrazeno 1 - 10
of 91
pro vyhledávání: '"Belinchón, J. A."'
Publikováno v:
A&A 636, A53 (2020)
Population studies of the orbital characteristics of exoplanets in multi-planet systems have highlighted the existence of an anticorrelation between the average orbital eccentricity of planets and the number of planets of their host system, that is,
Externí odkaz:
http://arxiv.org/abs/2003.05366
Publikováno v:
Journal of Applied Mathematics and Engineering Vol 8 (2016) Part I, pages 25-34
In this work we obtain an approximate solution of the strongly nonlinear second order differential equation $\frac{d^{2}u}{dt^{2}}+\omega ^{2}u+\alpha u^{2}\frac{d^{2}u}{dt^{2}}+\alpha u\left( \frac{du}{dt}\right)^{2}+\beta \omega ^{2}u^{3}=0$, descr
Externí odkaz:
http://arxiv.org/abs/1707.05369
Scalar-tensor gravitational theories are important extensions of standard general relativity, which can explain both the initial inflationary evolution, as well as the late accelerating expansion of the Universe. In the present paper we investigate t
Externí odkaz:
http://arxiv.org/abs/1612.05446
Publikováno v:
Rev. Mex. Fis. 63 (2017) 218-222
The factorization of nonlinear second-order differential equations proposed by Rosu and Cornejo-Perez in 2005 is extended to equations containing quadratic and cubic forms in the first derivative. A few illustrative examples encountered in physics ar
Externí odkaz:
http://arxiv.org/abs/1612.01938
Publikováno v:
Astrophys Space Sci (2016) 361:52
In this paper, we investigate the Noether symmetries of a generalized scalar-tensor, Brans-Dicke type cosmological model, in which we consider explicit scalar field dependent couplings to the Ricci scalar, and to the scalar field kinetic energy, resp
Externí odkaz:
http://arxiv.org/abs/1512.08054
Autor:
Cornejo-Pérez, O., Belinchón, J. A.
Publikováno v:
International Journal of Modern Physics D, Vol. 22, No. 6 (2013) 1350031
We study the classical flat full causal bulk viscous FRW cosmological model through the factorization method. The method shows that there exists a relationship between the viscosity parameter $s$ and the parameter $\gamma$ entering the equations of s
Externí odkaz:
http://arxiv.org/abs/1204.5938
Autor:
Belinchón, J. A.
We study several cosmological models with Bianchi \textrm{VI}$_{0}$ symmetries under the self-similar approach. In order to study how the \textquotedblleft constants\textquotedblright\ $G$ and $\Lambda$ may vary, we propose three scenarios where such
Externí odkaz:
http://arxiv.org/abs/1109.2880
Autor:
Belinchón, J. A.
Publikováno v:
Eur. Phys. J. C (2012) 72:1866
We study through symmetry principles the form of the functions in the generalizated scalar-tensor theories under the self-similar hypothesis. The results obtained are absolutely general and valid for all the Bianchi models and the flat FRW one. We st
Externí odkaz:
http://arxiv.org/abs/1109.2877
Autor:
Belinchón, J. A.
Publikováno v:
Spacetime and Substance 6 (2005) 1-7
We study a full causal bulk viscous cosmological model with flat FRW symmetries and where the ``constants'' $G,c$ and $\Lambda $ vary. We take into account the possible effects of a $c-$variable into the curvature tensor in order to outline the field
Externí odkaz:
http://arxiv.org/abs/gr-qc/0501019
Autor:
Belinchón, J. A.
In this paper, we study the equation of state admissible for a flat FRW models filled with a bulk viscous fluid by using the Lie group method. It is founded that the model admits scaling symmetries iff the bulk viscous parameter $\gamma =1/2$. In thi
Externí odkaz:
http://arxiv.org/abs/gr-qc/0412092