Electrical conductivity of the quark-gluon plasma: perspective from lattice QCD

Aarts, Gert; Николаев, А. А.

doi:10.1140/epja/s10050-021-00436-5

Cited by 29 publications

(18 citation statements)

References 64 publications

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“…Since we work in the fixed-scale approach, we cannot exclude that once the data is extrapolated to a → 0, SU (2) gauge theory might also exhibit a weak diamagnetic response. On the other hand, in the paramagnetic regime the susceptibility tends to slightly decrease towards the continuum limit [2,9,26]. We therefore expect that our result at finite lattice spacing might be slightly larger than the corresponding continuum limit.…”

Section: Numerical Resultsmentioning

confidence: 61%

Static magnetic susceptibility in finite-density $$SU\left( 2\right) $$ lattice gauge theory

2021

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We study static magnetic susceptibility $$\chi (T, \mu )$$ χ ( T , μ ) in SU(2) lattice gauge theory with $$N_f = 2$$ N f = 2 light flavours of dynamical fermions at finite chemical potential $$\mu $$ μ . Using linear response theory we find that SU(2) gauge theory exhibits paramagnetic behavior in both the high-temperature deconfined regime and the low-temperature confining regime. Paramagnetic response becomes stronger at higher temperatures and larger values of the chemical potential. For our range of temperatures $$0.727 \le T/T_c \le 2.67$$ 0.727 ≤ T / T c ≤ 2.67 , the first coefficient of the expansion of $$\chi \left( T, \mu \right) $$ χ T , μ in even powers of $$\mu /T$$ μ / T around $$\mu =0$$ μ = 0 is close to that of free quarks and lies in the range $$(2, \ldots , 5) \cdot 10^{-3}$$ ( 2 , … , 5 ) · 10 - 3 . The strongest paramagnetic response is found in the diquark condensation phase at $$\mu >m\pi /2$$ μ > m π / 2 .

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Section: Numerical Resultsmentioning

confidence: 61%

Static magnetic susceptibility in finite-density $$SU\left( 2\right) $$ lattice gauge theory

2021

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“…For comparison, we also present the results as obtained using lattice QCD for two light flavors Refs. [111,112] and 2+1 flavor NJL model results as obtained in Ref. [31].…”

Section: Resultsmentioning

confidence: 89%

“…For comparison, we also presented the two flavor Lattice QCD (LQCD) data as given in Refs. [111,112] and 2+1 flavor NJL model results as obtained in Ref. [31].…”

Section: Resultsmentioning

confidence: 89%

Thermoelectric transport coefficients of quark matter

et al. 2022

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A thermal gradient and/or a chemical potential gradient in a conducting medium can lead to an electric field, an effect known as thermoelectric effect or Seebeck effect. In the context of heavy-ion collisions, we estimate the thermoelectric transport coefficients for quark matter within the ambit of the Nambu–Jona Lasinio (NJL) model. We estimate the thermal conductivity, electrical conductivity, and the Seebeck coefficient of hot and dense quark matter. These coefficients are calculated using the relativistic Boltzmann transport equation within relaxation time approximation. The relaxation times for the quarks are estimated from the quark–quark and quark–antiquark scattering through meson exchange within the NJL model. As a comparison to the NJL model estimation of the Seebeck coefficient, we also estimate the Seebeck coefficient within a quasiparticle approach.

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“…The electrical conductivity has been computed on the lattice by a number of groups using various approaches (see [98] for a recent review). In addition to earlier results with O(a) improved Wilson fermions and heavier than physical light quarks [99][100][101], there are now results using staggered fermions with physical up, down and strange quark masses [102,103].…”

Section: Transportmentioning

confidence: 99%