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Nuclear Theory·nucl-th

Thursday·February 3, 2022

7 papers—3 primary·4 cross-listed

All7Primary3Cross-lists4
  1. 01

    Quantum Skyrmion crystals and the symmetry energy of dense matter

    Christoph Adam🇪🇸 · Alberto García Martín-Caro🇪🇸 · Miguel Huidobro🇪🇸 · Ricardo Vázquez🇪🇸 · Andrzej Wereszczynski🇵🇱

    The canonical quantization method for collective coordinates in crystalline configurations of the generalized Skyrme model is applied in order to find the quantum ground state of Skyrmion crystals and study the quantum corrections to the binding energy resulting from the isospin degrees of freedom. This leads to a consistent description of asymmetric nuclear matter within the Skyrme framework and allows us to compute the symmetry energy of the Skyrmionic crystal as a function of the baryon density, and to compare with recent observational constraints.

    nucl-thhep-thPRD(2022)·18 citations
  2. 02

    Investigation of the Lorentz invariance violation in two-neutrino double-beta decay

    S.A. Ghinescu🇷🇴 · O. Nitescu🇷🇴 · S. Stoica🇷🇴

    We make a comprehensive investigation of the Lorentz invariance violation (LIV) effects that may occur in two-neutrino double-beta () decay for all the experimentally interesting nuclei. We deduce the formulas for the LIV deviations and provide single and summed energy electron spectra and angular correlation between electrons with and without LIV contributions, to be used for constraining the LIV coefficient . First, we confirm the shifting of the electron spectra to higher electron energies due to LIV for all nuclei. Next, we analyze other LIV signatures that can be used in LIV investigations. Thus, from the comparison of the electron and angular correlation spectra calculated with the inclusion of the LIV contributions, with their standard forms, information can be obtained about the strength versus observability of the LIV effects in the current experimental statistics. Then, we present the alternative method of constraining from the measurement of the angular correlation coefficient and estimate the statistics that different double-beta decay experiments should reach to constrain the LIV coefficient at the level of the current beta decay experiments. We hope that our work will improve the theoretical support and further stimulate the search for LIV in double-beta decay.

    nucl-thPRD(2022)·8 citations
  3. 03

    Nuclear Forces for Precision Nuclear Physics -- a collection of perspectives

    Ingo Tews🇺🇸 · Zohreh Davoudi🇺🇸 · Andreas Ekström🇸🇪 · Jason D. Holt🇨🇦 · Kevin Becker🇺🇸 · Raúl Briceño🇺🇸 · David J. Dean🇺🇸 · William Detmold🇺🇸 · Christian Drischler🇺🇸 · Thomas Duguet🇫🇷 · Evgeny Epelbaum🇩🇪 · Ashot Gasparyan🇩🇪 and 33 other authors

    This is a collection of perspective pieces contributed by the participants of the Institute of Nuclear Theory's Program on Nuclear Physics for Precision Nuclear Physics which was held virtually from April 19 to May 7, 2021. The collection represents the reflections of a vibrant and engaged community of researchers on the status of theoretical research in low-energy nuclear physics, the challenges ahead, and new ideas and strategies to make progress in nuclear structure and reaction physics, effective field theory, lattice QCD, quantum information, and quantum computing. The contributed pieces solely reflect the perspectives of the respective authors and do not represent the viewpoints of the Institute for Nuclear theory or the organizers of the program.

    nucl-thhep-lathep-phFew Body Syst.(2022)·66 citations
  4. 04

    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.

    ↳ hep-phnucl-thPLB(2022)·17 citations
  5. 05

    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.

    ↳ hep-phcond-mat.str-elhep-thnucl-thUniverse(2021)·1 citation
  6. 06

    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.

    ↳ hep-phnucl-thUniverse(2019)·18 citations

Affiliations

first authorsco-authorsvia INSPIRE