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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. |
