Quantum behaviour near a spacelike boundary in the c=1 matrix model

TL;DR

This paper studies quantum properties of time-dependent configurations with spacelike boundaries in the c=1 matrix model, analyzing fermionic eigenvalues and correlators to understand their quantum behavior.

Contribution

It introduces a detailed analysis of quantum dynamics near spacelike boundaries in the c=1 matrix model, including transformations between different time variables and fermionic correlator calculations.

Findings

Derived unitary transformations between different time descriptions.

Calculated fermion correlators in time-dependent backgrounds.

Represented configurations as states in the original Hilbert space.

Abstract

Certain time dependent configurations in the c=1 matrix model correspond to string theory backgrounds which have spacelike boundaries and appear geodesically incomplete. We investigate quantum mechanical properties of a class of such configurations in the matrix model, in terms of fermionic eigenvalues. We describe Hamiltonian evolution of the eigenvalue density using several different time variables, some of which are infinite and some of which are finite in extent. We derive unitary transformations relating these different descriptions, and use those to calculate fermion correlators in the time dependent background. Using the chiral formalism, we write the time dependent configurations as a state in the original matrix model Hilbert space.