Non-minimal quintessence with nearly flat potential
نویسندگان
چکیده
منابع مشابه
Quintessence, Flat Potential and String/M Theory Axion
A slow-rolling scalar field (Quintessence) has been proposed as the origin of accelerating universe at present. We discuss some features of quintessence, particularly those related with the flatness of its potential. We distinguish two types of quintessences, a metrical quintessence which couples to the particle physics sector only through the mixing with the spacetime metric and a non-metrical...
متن کاملNon-Gaussianity in Curvaton Models with Nearly Quadratic Potential
We consider curvaton models with potentials that depart slightly from the quadratic form. We show that although such a small departure does not modify significantly the Gaussian part of the curvature perturbation, it can have a pronounced effect on the level of non-Gaussianity. We find that unlike in the quadratic case, the limit of small non-Gaussianity, |fNL| ≪ 1 , is quite possible even with...
متن کاملQuintessence Cosmologies with a Double Exponential Potential
We use phase space methods to investigate closed, flat, and open FriedmannRobertson-Walker cosmologies with a scalar potential given by the sum of two exponential terms. The form of the potential is motivated by the dimensional reduction of M-theory with non-trivial four-form flux on a maximally symmetric internal space. To describe the asymptotic features of run-away solutions we introduce the...
متن کاملNon–Abelian Flat Directions in a Minimal Superstring Standard Model
Recently, by studying exact flat directions of non–Abelian singlet fields, we demonstrated the existence of free fermionic heterotic–string models in which the SU(3)C × SU(2)L × U(1)Y –charged matter spectrum, just below the string scale, consists solely of the MSSM spectrum. In this paper we generalize the analysis to include VEVs of non–Abelian fields. We find several, MSSM–producing, exact n...
متن کاملMinimal Flat Knotted Ribbons
This paper gives mathematical models for flat knotted ribbons, and makes specific conjectures for the least length of ribbon (for a given width)) needed to tie the trefoil knot and the figure eight knot. The first conjecture states that (for width one) the least length of ribbon needed to tie an open-ended trefoil knot is
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Journal of Cosmology and Astroparticle Physics
سال: 2009
ISSN: 1475-7516
DOI: 10.1088/1475-7516/2009/09/027