Temperature-dependence of the QCD topological susceptibility

Research output: Contribution to journalConference article

Abstract

We recently obtained an estimate of the axion mass based on the hypothesis that axions make up most of the dark matter in the universe. A key ingredient for this calculation was the temperature-dependence of the topological susceptibility of full QCD. Here we summarize the calculation of the susceptibility in a range of temperatures from well below the finite temperature cross-over to around 2 GeV. The two main difficulties of the calculation are the unexpectedly slow convergence of the susceptibility to its continuum limit and the poor sampling of nonzero topological sectors at high temperature. We discuss how these problems can be solved by two new techniques, the first one with reweighting using the quark zero modes and the second one with the integration method.

Original languageEnglish
Article number01013
JournalEPJ Web of Conferences
Volume175
DOIs
Publication statusPublished - Mar 26 2018
Event35th International Symposium on Lattice Field Theory, Lattice 2017 - Granada, Spain
Duration: Jun 18 2017Jun 24 2017

Fingerprint

quantum chromodynamics
magnetic permeability
temperature dependence
ingredients
dark matter
sectors
universe
sampling
quarks
continuums
temperature
estimates

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Temperature-dependence of the QCD topological susceptibility. / Kovács, T.

In: EPJ Web of Conferences, Vol. 175, 01013, 26.03.2018.

Research output: Contribution to journalConference article

@article{88e1a000afe547f987c9bcb570f28251,
title = "Temperature-dependence of the QCD topological susceptibility",
abstract = "We recently obtained an estimate of the axion mass based on the hypothesis that axions make up most of the dark matter in the universe. A key ingredient for this calculation was the temperature-dependence of the topological susceptibility of full QCD. Here we summarize the calculation of the susceptibility in a range of temperatures from well below the finite temperature cross-over to around 2 GeV. The two main difficulties of the calculation are the unexpectedly slow convergence of the susceptibility to its continuum limit and the poor sampling of nonzero topological sectors at high temperature. We discuss how these problems can be solved by two new techniques, the first one with reweighting using the quark zero modes and the second one with the integration method.",
author = "T. Kov{\'a}cs",
year = "2018",
month = "3",
day = "26",
doi = "10.1051/epjconf/201817501013",
language = "English",
volume = "175",
journal = "EPJ Web of Conferences",
issn = "2101-6275",
publisher = "EDP Sciences",

}

TY - JOUR

T1 - Temperature-dependence of the QCD topological susceptibility

AU - Kovács, T.

PY - 2018/3/26

Y1 - 2018/3/26

N2 - We recently obtained an estimate of the axion mass based on the hypothesis that axions make up most of the dark matter in the universe. A key ingredient for this calculation was the temperature-dependence of the topological susceptibility of full QCD. Here we summarize the calculation of the susceptibility in a range of temperatures from well below the finite temperature cross-over to around 2 GeV. The two main difficulties of the calculation are the unexpectedly slow convergence of the susceptibility to its continuum limit and the poor sampling of nonzero topological sectors at high temperature. We discuss how these problems can be solved by two new techniques, the first one with reweighting using the quark zero modes and the second one with the integration method.

AB - We recently obtained an estimate of the axion mass based on the hypothesis that axions make up most of the dark matter in the universe. A key ingredient for this calculation was the temperature-dependence of the topological susceptibility of full QCD. Here we summarize the calculation of the susceptibility in a range of temperatures from well below the finite temperature cross-over to around 2 GeV. The two main difficulties of the calculation are the unexpectedly slow convergence of the susceptibility to its continuum limit and the poor sampling of nonzero topological sectors at high temperature. We discuss how these problems can be solved by two new techniques, the first one with reweighting using the quark zero modes and the second one with the integration method.

UR - http://www.scopus.com/inward/record.url?scp=85045141234&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85045141234&partnerID=8YFLogxK

U2 - 10.1051/epjconf/201817501013

DO - 10.1051/epjconf/201817501013

M3 - Conference article

AN - SCOPUS:85045141234

VL - 175

JO - EPJ Web of Conferences

JF - EPJ Web of Conferences

SN - 2101-6275

M1 - 01013

ER -