602 research outputs found
Measurement of the inclusive branching fraction tau- ---> TAU-neutrino pi- pi0 + neutral meson(s)
Inflation and non-minimal scalar-curvature coupling in gravity and supergravity
Inflationary slow-roll dynamics in Einstein gravity with a non-minimal
scalar-curvature coupling can be equivalent to that in the certain f(R) gravity
theory. We review the correspondence and extend it to N=1 supergravity. The
non-minimal coupling in supergravity is rewritten in terms of the standard
(`minimal') N=1 matter-coupled supergravity by using curved superspace. The
established equivalence between two different inflationary theories means the
same inflaton scalar potential, and does not imply the same post-inflationary
dynamics and reheating.Comment: 18 pages, no figures, LaTeX. minor changes, references added, the
version published in JCAP. arXiv admin note: substantial text overlap with
arXiv:1201.2239, arXiv:1011.024
Scalar field exact solutions for non-flat FLRW cosmology: A technique from non-linear Schr\"odinger-type formulation
We report a method of solving for canonical scalar field exact solution in a
non-flat FLRW universe with barotropic fluid using non-linear Schr\"{o}dinger
(NLS)-type formulation in comparison to the method in the standard Friedmann
framework. We consider phantom and non-phantom scalar field cases with
exponential and power-law accelerating expansion. Analysis on effective
equation of state to both cases of expansion is also performed. We speculate
and comment on some advantage and disadvantage of using the NLS formulation in
solving for the exact solution.Comment: 12 pages, GERG format, Reference added. accepted by Gen. Relativ. and
Gra
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