Zobrazeno 1 - 10
of 52
pro vyhledávání: '"ALVES, M. E. S."'
Problems with the concordance cosmology $\Lambda$CDM as the cosmological constant problem, coincidence problems and Hubble tension has led to many proposed alternatives, as the $\Lambda(t)$CDM, where the now called $\Lambda$ cosmological term is allo
Externí odkaz:
http://arxiv.org/abs/2305.18591
Publikováno v:
Eur. Phys. J. C (2019) 79:543
An unified cosmological model for an Universe filled with a mass dimension one (MDO) fermionic field plus the standard matter fields is considered. After a primordial quantum fluctuation the field slowly rolls down to the bottom of a symmetry breakin
Externí odkaz:
http://arxiv.org/abs/1811.00390
Publikováno v:
Eur. Phys. J. C (2019) 79: 175
The attempt to describe the recent accelerated expansion of the Universe includes different propositions for dark energy models and modified gravity theories. Establish their features in order to discriminate and even rule out part of these models us
Externí odkaz:
http://arxiv.org/abs/1801.04534
Publikováno v:
Eur. Phys. J. C (2018) 78: 710
Among the various possibilities to probe the theory behind the recent accelerated expansion of the universe, the energy conditions (ECs) are of particular interest, since it is possible to confront and constrain the many models, including different t
Externí odkaz:
http://arxiv.org/abs/1711.07259
Publikováno v:
Phys. Rev. D 94, 024032 (2016)
There is a host of alternative theories of gravitation in the literature, among them the $f(R,T)$ recently elaborated by Harko and collaborators. In these theories the $R$ and $T$ are respectively the Ricci scalar and the trace of the energy momentum
Externí odkaz:
http://arxiv.org/abs/1604.03874
We investigate the cosmological production of gravitational waves in a nonsingular flat cosmology powered by a "running vacuum" energy density described by $\rho_{\Lambda}\equiv\rho_{\Lambda}(H)$, a phenomenological expression potentially linked with
Externí odkaz:
http://arxiv.org/abs/1504.07092
Publikováno v:
Astroparticle Physics, Volume 48, pages 50-60 (August 2013)
We analyze the sensitivities of a geostationary gravitational wave interferometer mission operating in the sub-Hertz band. Because of its smaller armlength, in the lower part of its accessible frequency band ($10^{-4} - 2 \times 10^{-2}$ Hz) our prop
Externí odkaz:
http://arxiv.org/abs/1112.1565
Publikováno v:
Phys.Rev.D83:103506,2011
We discuss the dynamics of the universe within the framework of Massive Graviton Dark Matter scenario (MGCDM) in which gravitons are geometrically treated as massive particles. In this modified gravity theory, the main effect of the gravitons is to a
Externí odkaz:
http://arxiv.org/abs/1103.1464
Publikováno v:
Mod. Phys. Lett. A 27, 1250022 (2012)
In this paper, we investigate gravitational waves as metric perturbations around a general warped 5-dimensional background. We find an analytical solution in Randall-Sundrum braneworld model and analyze the implications of braneworld models in the gr
Externí odkaz:
http://arxiv.org/abs/1012.5277
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