Generalized Chaplygin Gas, Accelerated Expansion and Dark Energy-Matter Unification
By M. C. Bento, O. Bertolami, A. Sen. 2002
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We consider the scenario emerging from the dynamics of a generalized $d$-brane in a $(d+1, 1)$ spacetime. The equation of state describing this system is given in terms of the energy density, $\rho$, and pressure, $p$, by the relationship $p = - A/\rho^{\alpha}$, where $A$ is a positive constant and $0 < \alpha \le 1$. We discuss the conditions under which homogeneity arises and show that this equation of state describes the evolution of a universe evolving from a phase dominated by non-relativistic matter to a phase dominated by a cosmological constant via an intermediate period where the effective equation of state is given by $p = \alpha \rho$.
Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics
View Paper: https://www.semanticscholar.org/paper/0ba3cdff6027fa3e638b3d8fd1143380c9f8200f
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Citations in the corpus
- Constraints on holographic dark energy from the latest supernovae, galaxy clustering, and cosmic microwave background anisotropy observations (2007, background): “Numerous other candidates for dark energy have also been proposed in the literature, such as an evolving canonical scalar field [14, 15, 16, 17, 18, 19] usually referred to as quintessence, the phantom energy [20, 21, 22] with an equation-of-state smaller than −1 violating the weak energy condition,”
- Mimetic Gravity: A Review of Recent Developments and Applications to Cosmology and Astrophysics (2016, background): “, [248, 249]), torsion theories such as f(T) theories (e.”
- New Hubble Space Telescope Discoveries of Type Ia Supernovae at z ≥ 1: Narrowing Constraints on the Early Behavior of Dark Energy (2006, background): “Competitors include the Chaplygin gas (Bento et al. 2002), topological defects, and a massless scalar field at low temperature.”
- Cosmological constraints on f(R) gravity theories within the Palatini approach (2005, result): “…et al. 2005; Freese & Lewis 2002; Meng & Wang 2003; Dolgov & Kawasaki 2003; Shao et al. 2005; Gong et al. 2004; Lima 2004; Ahmed et al. 2004; Bento et al. 2002, 2003) have been proposed, and they can with some degree of success account for the observations (Lue et al. 2004a,b; Lue 2003;…”
- Scrutinizing Exotic Cosmological Models Using ESSENCE Supernova Data Combined with Other Cosmological Probes (2007, background): “They are motivated by brane-world scenarios (Bento et al. 2002, and references therein) and may be able to unify dark matter and dark energy (Bilić et al. 2002).”
- Generalized Chaplygin gas as a unified scenario of dark matter/energy: Observational constraints (2004, background): “(Bento et al. 2002; Bilić et al 2002) and moreover it admits a well established brane interpretation (Kamenshchik et al. 2001; Bento et al. 2002; Bili´c et al 2002).”
- From cosmic deceleration to acceleration: new constraints from SN Ia and BAO/CMB (2012, background): “Neglecting baryons the flat quartessence Chaplygin model (p = −M4(α+1)/ρα) (see [13], [14], [15] and [16]), is obtained if (besides qi = 1/2) we assume qf = −1, identify 1/τ = 3(1 + α) and Ωm∞ = (1 − w0), where w0 = −(M(4)/ρ0) is the present value of the equation of state parameter.”
- Latest supernova data in the framework of the generalized Chaplygin gas model (2004, methodology): “The striking feature of this model is that it allows for an unification of dark energy and dark matter (Bento et al. 2002b).”