Flavored extended instanton in QCD

TL;DR

This paper introduces new flavored space-like defects in confined QCD, specifically an extended instanton solution called S-Skyrmion, which can be analyzed in holographic QCD and Chiral Perturbation Theory, revealing topological and physical insights.

Contribution

It presents the concept of flavored space-like defects in QCD, focusing on the S-Skyrmion as a novel extended instanton solution with topological quantization.

Findings

Identification of S-Skyrmion in holographic QCD and ChPT

Transformation of Skyrmion charges into currents

Analogy with Thouless pump and quantum phase slip phenomena

Abstract

In this paper we discuss new flavored space-like defects in confined QCD which can be considered as the Euclidean extended instantons carrying the topologically quantized currents. We focus on the simplest 1d space-like defect - the S-Skyrmion solution extended in one space coordinate and localized in Euclidean time. It can be identified both in the holographic QCD and in the Chiral Perturbation Theory(ChPT). The Skyrmion charges get transformed into the corresponding currents for S-Skyrmion. The analogy with the Thouless pump and the quantum phase slip phenomena is mentioned.