Matrix Cosmology
Joanna L. Karczmarek, Andrew Strominger
TL;DR
This paper presents exact time-dependent solutions in c=1 string theory, interpreting some as closed string tachyon condensation and others as bouncing cosmologies, using the free fermion formulation.
Contribution
It introduces new classes of solutions describing cosmological bounces and tachyon condensation within the free fermion framework of c=1 string theory.
Findings
Solutions describe Fermi sea draining and cosmological bounces
Interpretation as closed string tachyon condensation
Solutions provide insights into non-singular cosmologies
Abstract
Exact time-dependent solutions of c=1 string theory are described using the free fermion formulation. One such class of solutions describes draining of the Fermi sea and has a spacetime interpretation as closed string tachyon condensation. A second class of solutions, corresponding to droplets of Fermi liquid orbiting in phase space, describes closed cosmologies which bounce through singularities.
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