Initial conditions in hybrid inflation: exploration by MCMC technique

Details Initial conditions in hybrid inflation: exploration by MCMC technique Initial conditions in hybrid inflation: exploration by MCMC technique

2010-06-23

arxiv.org/abs/1006.4435v1

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

Proceedings of the 45th Rencontres de Moriond conference, March 13 - 20, 2010, La Thuile, Italy

Scientific paper

In hybrid inflation, initial field values leading to sufficiently long inflation were thought be fine-tuned in a narrow band along the inflationary valley. A re-analysis of this problem has shown that there exists a non negligible proportion of successful initial conditions exterior to the valley, organized in a complex structure with fractal boundaries, and whose origin has been explained. Their existence in a large part of the parameter space has been demonstrated using a bayesian Monte-Carlo-Markov-Chain (MCMC) method, and natural bounds on potential parameters have been established. Moreover, these results are shown to be valid not only for the original hybrid model, but also for other hybrid realizations in various frameworks.

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