2018-01-22

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[[UTAPwiki/セミナー/初期宇宙・相対論速報]]
Speaker: Eugeny Babichev (Laboratoire de Physique Théorique d'Orsay)
Title: Caustic free completion of k-essence
Abstract:
Both k-essence and the pressureless perfect fluid develop caustic
singularities at finite time. We explore the connection between the two
and show that they belong to the same class of models, which admits the
caustic free completion by means of the canonical complex scalar field.
Specifically, the free massive/self-interacting complex scalar
reproduces dynamics of pressureless perfect fluid/shift-symmetric
k-essence under certain initial conditions in the limit of large
mass/sharp self-interacting potential. We elucidate a mechanism of
resolving caustic singularities in the complete picture.

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