Speed of sound in dense strong-interaction matter

Braun, Jens; Geißel, Andreas; Schallmo, Benedikt

doi:10.48550/arxiv.2206.06328

Cited by 2 publications

(4 citation statements)

References 76 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…To investigate a much higher-density regime, a finer lattice simulation or a lighter quark mass simulation where 𝑚 𝜋 also becomes lighter is needed, but such a simulation is costly. [32]. (Right) Hard-thermal-loop resummation analysis, originally given in Ref.…”

Section: Discussion 61 Still Higher-density Regimementioning

confidence: 99%

“…On the other hand, analyses using the functional renormalization group for an effective theory of 3-color QCD with diquark gap (Δ) [32] and the hard-thermal-loop resummation technique [33] suggest that 𝑐 2 𝑠 /𝑐 2 still exceeds the conformal bound in a fairly high-density regime.…”

Section: Discussion 61 Still Higher-density Regimementioning

confidence: 99%

“…Figure5: (Left) Functional renormalization group for an effective theory of 3-color QCD with diquark gap (Δ), originally given in Ref [32]…”

mentioning

confidence: 99%

See 2 more Smart Citations

Speed of sound exceeding the conformal bound in dense 2-color QCD

Itou,

Iida

2024

Proceedings of the 40th International Symposium on Lattice Field Theory — PoS(LATTICE2023)

View full text Add to dashboard Cite

We review recent works on the Monte Carlo simulations of dense two-color QCD (QC 2 D) by focusing on the phase diagram, the equation of state, and the sound velocity at nonzero quark chemical potential. A possible upper bound of the sound velocity is known as the conformal bound, namely, 𝑐 2 𝑠 /𝑐 2 ≤ 1/3. The sound velocity is below the bound at least in the case of finite-temperature QCD. However, our recent work [1] shows the breaking of this bound in dense QC 2 D. This phenomenon was previously unknown from any lattice calculations. We also discuss recent related works including lattice studies on QCD at nonzero isospin chemical potential, some effective model analyses, and an analysis based on recent neutron star observations. These works also suggest the breaking of the conformal bound.

show abstract

Section: Discussion 61 Still Higher-density Regimementioning

confidence: 99%

Section: Discussion 61 Still Higher-density Regimementioning

confidence: 99%

See 1 more Smart Citation

Speed of sound exceeding the conformal bound in dense 2-color QCD

Itou,

Iida

2024

Proceedings of the 40th International Symposium on Lattice Field Theory — PoS(LATTICE2023)

View full text Add to dashboard Cite

show abstract

“…Future studies have to establish to what extent pQCD constraints are robust at densities of the order of several times nuclear saturation density, and how constraining future higher-order calculations may become. In this regard, improved microscopic calculations of the nuclear EOS using the functional renormalization group [227,228] will provide important insights.…”

Section: Challenges and Opportunitiesmentioning

confidence: 99%