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Nuclear Theory·nucl-th

Monday·May 6, 2024

8 papers—5 primary·3 cross-listed

All8Primary5Cross-lists3
  1. 06

    Approaching the conformal limit of quark matter with different chemical potentials

    Connor Brown🇺🇸 · Veronica Dexheimer🇺🇸 · Rafael Bán Jacobsen🇧🇷 · Ricardo Luciano Sonego Farias🇧🇷

    We study in detail the influence of different chemical potentials (baryon, charged, strange, and neutrino) on how and how fast a free gas of quarks in the zero-temperature limit reaches the conformal limit. We discuss the influence of non-zero masses, the inclusion of leptons, and different constraints, such as charge neutrality, zero-net strangeness, and fixed lepton fraction. We also investigate for the first time how the symmetry energy of the system under some of these conditions approaches the conformal limit. Finally, we briefly discuss what kind of corrections are expected from perturbative QCD as one goes away from the conformal limit.

    ↳ hep-phastro-ph.HEastro-ph.SRhep-th+1Symmetry(2024)·4 citations
  2. 07

    On the (in)consistency of perturbation theory at finite temperature

    Peter Lowdon🇩🇪 · Owe Philipsen🇩🇪

    A well-known difficulty of perturbative approaches to quantum field theory at finite temperature is the necessity to address theoretical constraints that are not present in the vacuum theory. In this work, we use lattice simulations of scalar correlation functions in massive theory to analyse the extent to which these constraints affect the perturbative predictions. We find that the standard perturbative predictions deteriorate even in the absence of infrared divergences at relatively low temperatures, and that this is directly connected to the analytic structure of the propagators used in the expansion. This suggests that the incorporation of non-perturbative thermal effects in the propagators is essential for a consistent perturbative formulation of scalar quantum field theories at finite temperature. By utilising the spectral constraints imposed on finite-temperature correlation functions, we explore how these effects manifest themselves in the lattice data, and discuss why the presence of distinct thermoparticle excitations provides a potential resolution to these issues.

    ↳ hep-phhep-lathep-thnucl-thJHEP(2024)·10 citations
  3. 08

    Intriguing aspects of light baryon resonances

    K. P. Khemchandani🇧🇷 · A. Martinez Torres🇧🇷 · Sang-Ho Kim🇰🇷 · Seung-il Nam🇰🇷 · A. Hosaka🇯🇵 · H. Nagahiro🇯🇵

    We discuss that some light baryon resonances exhibit properties which cannot be described when attributing a three-valence quark structure to them. Besides pointing out the hadron resonances which clearly require description beyond the quark model, we focus on the third state and its decay to final states consisting of the lightest hyperon resonances which have a partial width comparable to that for the decay to . Such properties of the mentioned nucleon resonance get manifested in the cross sections and other observables related to processes producing the lightest hyperon resonances. We show that all these findings arise from the strong association of the baryon resonances to the dynamics among the ground-state hadrons.

    ↳ hep-phnucl-thEPJ Web Conf.(2024)·0 citations

Affiliations

first authorsco-authorsvia INSPIRE