Ultra-soft fermionic excitation at finite chemical potential - Archive ouverte HAL Access content directly
Journal Articles Physical Review D Year : 2014

## Ultra-soft fermionic excitation at finite chemical potential

(1) , (2, 3)
1
2
3
Jean-Paul Blaizot
• Function : Correspondent author
• PersonId : 828605

Connectez-vous pour contacter l'auteur

#### Abstract

It has been suggested previously that an ultra-soft fermionic excitation develops, albeit with a small spectral weight, in a system of massless fermions and scalar bosons with Yukawa interaction at high temperature ($T$). In this paper we study how this excitation is modified at finite chemical potential ($\mu$). We relate the existence of the ultra-soft mode to symmetries, in particular charge conjugation, and a supersymmetry of the free system which is spontaneously broken by finite temperature and finite density effects, as argued earlier by Lebedev and Smilga. A non vanishing chemical potential breaks both symmetries explicitly, and maximally at zero temperature where the mode ceases to exist. A detailed calculation indicates that the ultra-soft excitation persists as long as $T\geq$0.71$\mu$.

### Dates and versions

cea-00979552 , version 1 (03-09-2020)

### Identifiers

• HAL Id : cea-00979552 , version 1
• ARXIV :
• DOI :

### Cite

Jean-Paul Blaizot, Daisuke Satow. Ultra-soft fermionic excitation at finite chemical potential. Physical Review D, 2014, 89, pp.096001. ⟨10.1103/PhysRevD.89.096001⟩. ⟨cea-00979552⟩

### Export

BibTeX TEI Dublin Core DC Terms EndNote Datacite

96 View