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Nuclear Theory·nucl-th

Thursday·February 3, 2022

7 papers—3 primary·4 cross-listed

All7Primary3Cross-lists4
  1. 04

    [Submitted on 1 Feb 2022] (cross-list from hep-ph)

    Cooling of Neutron Stars admixed with Light Dark Matter: a case study

    M. Ángeles Pérez-García🇪🇸 · H. Grigorian🇷🇺 · C. Albertus🇪🇸 · D. Barba🇪🇸 · J. Silk🇫🇷

    Neutron Stars (NSs) are born as hot, lepton-rich objects that evolve according to the standard paradigm through subsequent stages where they radiate the excess of energy by emitting, first, neutrinos and, later on, photons. Current descriptions based on Standard Model calculations cannot fully explain all the existing cooling data series for the dozens of objects that have been reported. In this work, we consider the intriguing possibility that cooling NSs could be actually admixed with a fraction of light dark matter (LDM), . We focus on a particular case study assuming a generic light candidate with mass that undergoes self-annihilating reactions through pseudoscalar mediators producing neutrinos in the final state. We include one additional feature, allowing thermal conduction from LDM while inside the dark core. By performing simulations of the temperature evolution in the NS, we find that cooling patterns could be distorted by the presence of LDM and discuss these results in light of their observability.

    Comments:
    6 pages, 2 figures. Accepted in Phys. Lett. B
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2202.00702 [pdf]
    PLB(2022)·17 citations
  2. 05

    [Submitted on 2 Feb 2022] (cross-list from hep-ph)

    Nuclear matter in 1+1 dimensions

    Robert M. Konik🇺🇸 · Marton Lajer🇺🇸 · Robert D. Pisarski🇺🇸 · Alexei M. Tsvelik🇺🇸

    We review the solution of QCD in two spacetime dimensions. Following the analysis of Baluni, for a single flavor the model can be analyzed using Abelian bosonization. The theory can be analyzed in strong coupling, when the quarks are much lighter than the gauge coupling. In this limit, the theory is given by a Luttinger liquid.

    Comments:
    Submitted by R.D.P. to the journal Universe as part of the Special Issue "keV Warm Dark Matter ({\Lambda}WDM) in Agreement with Observations, in Tribute to Héctor J. De Vega"
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Strongly Correlated Electrons (cond-mat.str-el); High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th)
    arXiv:
    2202.01016 [pdf]
    Universe(2021)·1 citation
  3. 06

    [Submitted on 2 Feb 2022] (cross-list from hep-ph)

    A pedagagical introduction to the Lifshitz regime

    Robert D. Pisarski🇺🇸 · Vladimir V. Skokov🇺🇸 · Alexei M. Tsvelik🇺🇸

    We give an elementary and pedagogical review of the phase diagrams which are possible in Quantum ChromoDynamics (QCD). Currently, the emphasis is upon the appearance of a critical endpoint, where disordered and ordered phases meet. In many models, though, a Lifshitz point also arises. At a Lifshitz point, three phases meet: disordered, ordered, and one where spatially inhomogeneous phases arise. At the level of mean field theory, the appearance of a Lifshitz point does not dramatically affect the phase diagram. We argue, however, that fluctuations about the Lifshitz point are very strong in the infrared, and significantly alter the phase diagram. We discuss at length the analogy to inhomogenous polymers, where the Lifshitz regime produces a bicontinuous microemulsion. We briefly mention the possible relevance to the phase diagram of QCD.

    Comments:
    Contribution to the International Conference on New Frontiers in Physics, 2018. v2: corrected acknowledgements for RDP
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2202.01036 [pdf]
    Universe(2019)·18 citations
  4. 07

    [Submitted on 2 Feb 2022] (cross-list from hep-ph)

    How an condensate can spike the speed of sound in cold quarkyonic matter

    Robert D. Pisarski🇺🇸

    I describe a novel mechanism where the variation of an condensate can generate a "spike" in the speed of sound in hadronic matter. An condensate naturally increases the speed of sound; the real problem is how to get the speed of sound to decrease. I suggest this can happen through the appearance of a Quantum Pion Liquid.

    Comments:
    To appear in the Proceedings of the International conference on Critical Point and Onset of Deconfinement, 2021
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2202.01086 [pdf]
    PoS(2022)·0 citations

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