12 research outputs found
Finite-time singularities in f(R, T) gravity and the effect of conformal anomaly
We investigate gravity models ( is the curvature scalar and
is the trace of the stress-energy tensor of ordinary matter) that are able to
reproduce the four known types of future finite-time singularities. We choose a
suitable expression for the Hubble parameter in order to realise the cosmic
acceleration and we introduce two parameters, and , which
characterise each type of singularity. We address conformal anomaly and we
observe that it cannot remove the sudden singularity or the type IV one, but,
for some values of , the big rip and the type III singularity may be
avoided. We also find that, even without taking into account conformal anomaly,
the big rip and the type III singularity may be removed thanks to the presence
of the contribution of the theory.Comment: 18 pages; Accepted for publication in Canadian Journal of Physics
(CJP
Observational constraints on Rastall's cosmology
Rastall's theory is a modification of General Relativity, based on the
non-conservation of the stress-energy tensor. The latter is encoded in a
parameter such that restores the usual law. We test Rastall's theory in cosmology, on a flat
Robertson-Walker metric, investigating a two-fluid model and using the type Ia
supernovae Constitution dataset. One of the fluids is pressureless and obeys
the usual conservation law, whereas the other is described by an equation of
state , with constant. The Bayesian analysis of the
Constitution set does not strictly constrain the parameter and prefers
values of close to -1. We then address the evolution of small
perturbations and show that they are dramatically unstable if and
, i.e. General Relativity is the favored configuration. The only
alternative is , for which the dynamics becomes independent from
.Comment: Latex file, 14 pages, 6 figures in eps format. Substantial
modifications performed, main conclusions change
First records of Zygnematales (Zygnematophyceae, Streptophyta) for the state of Bahia, Brazil
CaracterĂsticas fĂsicas do maracujĂĄ-azedo em função do genĂłtipo e massa do fruto
Balanço de nitrogĂȘnio, concentraçÔes de ureia e sĂntese de proteĂna microbiana em caprinos alimentados com dietas contendo cana-de-açĂșcar tratada com Ăłxido de cĂĄlcio
Novas ocorrĂȘncias de desmĂdias filamentosas (Desmidiaceae, Zygnematophyceae) para o estado da Bahia, Brasil
Dual universe and hyperboloidal relative velocity surface arising from extended special relativity
DigestĂŁo dos nutrientes e balanço de compostos nitrogenados em cabras alimentadas com quatro nĂveis de proteĂna
Does Chaplygin gas have salvation?
Campos JP, Fabris JC, Perez R, Piattella OF, Velten H. Does Chaplygin gas have salvation? European Physical Journal C. 2013;73(4): 2357.We investigate the unification scenario provided by the generalized Chaplygin gas model (a perfect fluid characterized by an equation of state p = -A/rho(alpha)). Our concerns lie with a possible tension existing between background kinematic tests and those related to the evolution of small perturbations. We analyze data from the observation of the differential age of the universe, type Ia supernovae, baryon acoustic oscillations, and the position of the first peak of the angular spectrum of the cosmic background radiation. We show that these tests favor negative values of the parameter alpha: we find alpha = -0.089(-0.128)(+0.161) at the 2 sigma level and that alpha < 0 with 85 % confidence. These would correspond to negative values of the square speed of sound which are unacceptable from the point of view of structure formation. We discuss a possible solution to this problem, when the generalized Chaplygin gas is framed in the modified theory of gravity proposed by Rastall. We show that a fluid description within this theory does not serve the purpose, but it is necessary to frame the generalized Chaplygin gas in a scalar field theory. Finally, we address the standard general relativistic unification picture provided by the generalized Chaplygin gas in the case alpha = 0: this is usually considered to be undistinguishable from the standard Lambda CDM model, but we show that the evolution of small perturbations, governed by the Meszaros equation, is indeed different and the formation of sub-horizon GCG matter halos may be importantly affected in comparison with the Lambda CDM scenario