Lumps in the throat

TL;DR

This paper explores various solitonic lump solutions, including cosmic strings and semi-local defects, within warped throat backgrounds relevant to brane inflation, providing a unified framework and analyzing their cosmological implications.

Contribution

It introduces a unified approach using D3-brane wrapping modes to study diverse defects in warped backgrounds with fluxes, extending junction constructions to include cosmic necklaces and semi-local defects.

Findings

Constructed (p,q)-string junctions in curved backgrounds with fluxes.

Extended the junction framework to include cosmic necklaces.

Provided a generic method for semi-local defect construction in these settings.

Abstract

We study classical lump solutions in a warped throat where brane inflation takes place. Some of the solitonic or lump solutions that we study here are the (p,q) cosmic strings and their junctions, cosmic necklaces and semi-local strings and generic semi-local defects. We show how various wrapping modes of D3-branes may be used to study all these defects in one interpolating set-up. Our construction allows us to study (p,q)-string junctions in curved backgrounds and in the presence of non-trivial RR fluxes. We extend the junction construction to allow for the possibility of cosmic necklaces, and show how these new lump solutions form a consistent picture in the inflationary brane models. We also give a generic construction of semi-local defects in these backgrounds, and argue that our construction encompasses all possible constructions of semi-local defects with any global symmetries. The cosmological implications of these configurations are briefly studied.