Quintessence as a runaway dilaton

By M. Gasperini, F. Piazza, G. Veneziano. 2001

342 citations recorded by the source corpus.

We consider a late-time cosmological model based on a recent proposal that the infinite-bare-coupling limit of superstring/M-theory exists and has good phenomenological properties, including a vanishing cosmological constant, and a massless, decoupled dilaton. As it runs away to $+ \infty$, the dilaton can play the role of the quintessence field recently advocated to drive the late-time accelerated expansion of the Universe. If, as suggested by some string theory examples, appreciable deviations from General Relativity persist even today in the dark matter sector, the Universe may smoothly evolve from an initial "focusing" stage, lasting untill radiation--matter equality, to a "dragging" regime, which eventually gives rise to an accelerated expansion with frozen $\Omega(\rm{dark energy})/\Omega(\rm{dark matter})$.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/a9efaba248120c2497e918e5de9051eea1b45235

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Citations in the corpus

Generalized Curvature-Matter Couplings in Modified Gravity (2014, background): “Indeed, such couplings generically appear in Kaluza–Klein theories with compactified dimensions [127] or in the low energy effective limit of string theories [112,113,115–117], where the dilaton has been proposed to be a good candidate for quintessence [112] or the inflaton [113].”
Massive Gravity (2014, background): “[429, 120, 248] for the role of a dilaton scalar field on cosmology).”
Schwarzschild black hole surrounded by quintessence: null geodesics (2012, background): “eld. Such scalar ﬁeld models include 1fernando@nku.edu 1 but not limited to, quintessence [8], chameleon ﬁelds [9], K-essence [10], tachyon ﬁeld [11], phantom dark energy [12] and dilaton dark energy [13]. For a detailed review of various models of dark energy see [6]. Given the fact that dark energ”
Effective field theory of cosmological perturbations (2013, methodology): “On the opposite, in the presence of matter there is a ‘preferred’ physical [43] frame in the approximation—assumed throughout in this paper—that the weak equivalence principle (WEP) is satisfied8 and all matter fields are minimally coupled to a ‘universal’ metric gμν .”
f(R) Theories (2010, background): “Such a coupling is assumed to be negligibly small at low energy scales, as in the case of the runaway dilaton scenario [274, 176].”
Varying Constants, Gravitation and Cosmology (2010, methodology): “This model was extended [133] to the case where the coupling functions have a smooth finite limit for infinite value of the bare string coupling, so that Bi = Ci + O(e−φ), folling [229].”