Cosmological rolling solutions of nonlocal theories
Gianluca Calcagni, Giuseppe Nardelli
TL;DR
This paper discovers nonperturbative cosmological solutions in nonlocal scalar field theories, showing smooth rolling behavior due to Hubble friction, contrasting with oscillations in Minkowski space.
Contribution
It introduces nonperturbative solutions for nonlocal scalar fields in cosmology, linking string field theory to smooth cosmological evolution.
Findings
Minkowski solutions oscillate wildly
Cosmological solutions exhibit smooth rolling
Hubble friction stabilizes the evolution
Abstract
We find nonperturbative solutions of a nonlocal scalar field equation, with cubic or exponential potential on a cosmological background. The former case corresponds to the lowest level effective tachyon action of cubic string field theory. While the well known Minkowski solution is wildly oscillating, due to Hubble friction its cosmological counterpart describes smooth rolling towards the local minimum of the potential.
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