Cosmology and Astrophysical Constraints of Gauss-Bonnet Dark Energy

By Tomi Koivisto, D. Mota. 2006

229 citations recorded by the source corpus.

Abstract Cosmological consequences of a string-motivated dark energy scenario featuring a scalar field coupled to the Gauss–Bonnet invariant are investigated. We study the evolution of the universe in such a model, identifying its key properties. The evolution of the homogeneous background and cosmological perturbations, both at large and small scales, are calculated. The impact of the coupling on galaxy distributions and the cosmic microwave background is examined. We find the coupling provides a mechanism to viably onset the late acceleration, to alleviate the coincidence problem, and furthermore to effectively cross the phantom divide at the present while avoiding a Big Rip in the future. We show the model could explain the present cosmological observations, and discuss how various astrophysical and cosmological data, from the Solar system, supernovae Ia, cosmic microwave background radiation and large scale structure constrain it.

Subfields: Astronomy and Astrophysics

View Paper: https://www.semanticscholar.org/paper/0d77fe81b18b8056fb4fc5cbfe4c90db1f33674a

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Citations in the corpus

Vector field models of inflation and dark energy (2008, background): “Dark energy cosmologies with self-interactions of R(2) GB and with scalar couplings have been considered previously [26], [72]–[74].”
Modified Gravity and Cosmology (2011, background): “Late-time acceleration has also been studied in theories where a scalar field has been included, along with R and G, in the gravitational action [982, 960, 959, 36, 728, 729, 1223, 1097, 324, 37, 983, 80].”
Accelerating Cosmologies with an Anisotropic Equation of State (2007, methodology): “…dark energy models are in principle compatible with the FLRW metric but exhibit anisotropic stresses at the perturbative level, including nonminimally coupled fields, viscous fluids and modified gravity models (Koivisto and Mota 2006; Schimd et al. 2006; Mota et al. 2007; Koivisto & Mota 2007a,b).”
f(R) Theories (2010, methodology): “The GB coupling in the case (i) appears in lowenergy string effective action [275] and cosmological solutions in such a theory have been studied extensively (see [34, 273, 105, 147, 588, 409, 468] for the construction of nonsingular cosmological solutions and [463, 360, 361, 593, 523, 452, 453, 381,”