Fractional space-like branes

TL;DR

This paper introduces fractional space-like branes, instanton-like objects localized at orbifold fixed points, providing new insights into string theory models of cosmological singularities through various formalisms.

Contribution

It presents the construction of fractional space-like branes and explores their formulations using boundary state, adsorption, and fermionisation methods.

Findings

Defined fractional space-like branes in string theory.

Developed multiple formalisms for their description.

Applied these objects to models of cosmological singularities.

Abstract

We discuss construction and applications of instanton-like objects which we call fractional space-like branes. These objects are localised at a fixed point of a time-like (or more generally space-time) orbifold which is a string theoretical toy model of a cosmological singularity. We formulate them in boundary state, adsorption, and fermionisation approaches.