Initial conditions in hybrid inflation: exploration by MCMC technique - General Relativity and Quantum CosmologyReport as inadecuate




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Abstract: In hybrid inflation, initial field values leading to sufficiently longinflation were thought be fine-tuned in a narrow band along the inflationaryvalley. A re-analysis of this problem has shown that there exists a nonnegligible proportion of successful initial conditions exterior to the valley,organized in a complex structure with fractal boundaries, and whose origin hasbeen explained. Their existence in a large part of the parameter space has beendemonstrated using a bayesian Monte-Carlo-Markov-Chain MCMC method, andnatural bounds on potential parameters have been established. Moreover, theseresults are shown to be valid not only for the original hybrid model, but alsofor other hybrid realizations in various frameworks.



Author: Sebastien Clesse

Source: https://arxiv.org/







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