Soft Interactions in Cold Quark Matter

Gorda, Tyler; Kurkela, Aleksi; Paatelainen, Risto; Säppi, Saga; Vuorinen, Aleksi

doi:10.1103/physrevlett.127.162003

Title: Soft Interactions in Cold Quark Matter

Journal Article · 15 October 2021 · Physical Review Letters

DOI: https://doi.org/10.1103/physrevlett.127.162003 · OSTI ID:1825964

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Technical Univ. of Darmstadt (Germany); Helmholtz Research Academy for FAIR, Darmstadt (Germany)
Univ. of Stavanger (Norway)
Univ. of Helsinki (Finland). Helsinki Inst. of Physics
Univ. of Helsinki (Finland). Helsinki Inst. of Physics; European Centre for Theoretical Studies in Nuclear Physics and Related Areas (ECT*), Villazzano (Italy)

Accurate knowledge of the thermodynamic properties of zero-temperature, high-density quark matter plays an integral role in attempts to constrain the behavior of the dense QCD matter found inside neutron-star cores, irrespective of the phase realized inside the stars. In this Letter, we consider the weak-coupling expansion of the dense QCD equation of state and compute the next-to-next-to-next-to-leading-order contribution arising from the non-Abelian interactions among long-wavelength, dynamically screened gluonic fields. Accounting for these interactions requires an all-loop resummation, which can be performed using hard-thermal-loop (HTL) kinematic approximations. Concretely, we perform a full two-loop computation using the HTL effective theory, valid for the long-wavelength, or soft, modes. We find that the soft sector is well behaved within cold quark matter, contrary to the case encountered at high temperatures, and find that the new contribution decreases the renormalization-scale dependence of the equation of state at high density.

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Research Organization:: Univ. of Virginia, Charlottesville, VA (United States)

Sponsoring Organization:: USDOE Office of Science (SC); Academy of Finland; European Research Council (ERC)

Grant/Contract Number:: SC0007984; 1322507; 725369

OSTI ID:: 1825964

Alternate ID(s):: OSTI ID: 1980218

Journal Information:: Physical Review Letters, Vol. 127, Issue 16; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: Soft Interactions in Cold Quark Matter

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