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Stochastic quintessence

Authors: Martin, Jérôme; Musso, Marcello;

Stochastic quintessence

Abstract

The behavior of the quintessence field is studied during inflation. In order to have a satisfactory model of dark energy, the quintessence field value today should be as insensible to the initial conditions as possible. Usually, only the dependence on the initial conditions specified at the end of inflation or, equivalently, at the beginning of the radiation dominated era, is considered. Provided the quintessence field is initially within a large but, crucially, finite interval, its present value becomes independent of the initial value it started from. The question as to whether inflation naturally drives the quintessence field to the above-mentioned interval is addressed. Since the quantum effects turn out to be important, the formalism of stochastic inflation is used in order to calculate the evolution of the quintessence field. Moreover, the quantum effects originating from the inflaton field are also taken into account and are proved to be sub-dominant in most cases. Finally, the requirement that the quintessence field is on tracks today is shown to imply quite tight constraints on the initial values of the quintessence and inflaton fields at the beginning of inflation. In particular, the initial value of the inflaton field cannot be too large which indicates that the quintessential scenario seems to be compatible with inflation only if the total number of e-folds is quite small.

24 pages, 8 figures, RevTex

Countries
France, Belgium
Keywords

High Energy Physics - Theory, Background radiations, Mathematical computing, Parameter, FOS: Physical sciences, General Relativity and Quantum Cosmology (gr-qc), Astrophysics, Mathematical analysis, Quantum mechanics, Article, General Relativity and Quantum Cosmology, [SDU] Sciences of the Universe [physics], High Energy Physics - Phenomenology (hep-ph), Radiation energy, 98.80.Cq, Astrophysics (astro-ph), Correlation analysis, 98.70.Vc, High Energy Physics - Phenomenology, Stochastic model, High Energy Physics - Theory (hep-th), Technique, Density gradient, Particle-theory and field-theory models of the early Universe

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
21
Average
Top 10%
Top 10%
Green
bronze