Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-09-19
JCAP 0801:027,2008
Astronomy and Astrophysics
Astrophysics
14 pages, 9 figures, Accepted by JCAP without text changes, References added
Scientific paper
10.1088/1475-7516/2008/01/027
(Abridged) We study dissipative inflation in the regime where the dissipative term takes a specific form, \Gamma=\Gamma(\phi), analyzing two models in the weak and strong dissipative regimes with a SUSY breaking potential. After developing intuition about the predictions from these models through analytic approximations, we compute the predicted cosmological observables through full numerical evolution of the equations of motion, relating the mass scale and scale of dissipation to the characteristic amplitude and shape of the primordial power spectrum. We then use Markov Chain Monte Carlo techniques to constrain a subset of the models with cosmological data from the cosmic microwave background (WMAP three-year data) and large scale structure (SDSS Luminous Red Galaxy power spectrum). We find that the posterior distributions of the dissipative parameters are highly non-Gaussian and their allowed ranges agree well with the expectations obtained using analytic approximations. In the weak regime, only the mass scale is tightly constrained; conversely, in the strong regime, only the dissipative coefficient is tightly constrained. A lower limit is seen on the inflation scale: a sub-Planckian inflaton is disfavoured by the data. In both weak and strong regimes, we reconstruct the limits on the primordial power spectrum and show that these models prefer a {\it red} spectrum, with no significant running of the index. We calculate the reheat temperature and show that the gravitino problem can be overcome with large dissipation, which in turn leads to large levels of non-Gaussianity: if dissipative inflation is to evade the gravitino problem, the predicted level of non-Gaussianity might be seen by the Planck satellite.
Hall Lisa M. H.
Peiris Hiranya V.
No associations
LandOfFree
Cosmological Constraints on Dissipative Models of Inflation does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Cosmological Constraints on Dissipative Models of Inflation, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Cosmological Constraints on Dissipative Models of Inflation will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-336060