Nuclear Theory·nucl-th

Monday·November 21, 2016

11 papers—5 primary·6 cross-listed

06
[Submitted on 15 Nov 2016] (cross-list from cond-mat.quant-gas)
Condensate of excitations in moving superfluids
E.E. Kolomeitsev · D.N. Voskresensky
A possibility of the condensation of excitations with a non-zero momentum in rectilinearly moving and rotating superfluid bosonic and fermionic (with Cooper pairing) media is considered in terms of a phenomenological order-parameter functional at zero and non-zero temperature. The results might be applicable to the description of bosonic systems like superfluid $^{4}$ He, ultracold atomic Bose gases, charged pion and kaon condensates in rotating neutron stars, and various superconducting fermionic systems with pairing, like proton and color-superconducting components in compact stars, metallic superconductors, and neutral fermionic systems with pairing, like the neutron component in compact stars and ultracold atomic Fermi gases. Order parameters of the "mother" condensate in the superfluid and the new condensate of excitations, corresponding energy gains, critical temperatures and critical velocities are found.
Comments:
15 pages, 1 figure reworked and extended version of arXiv:1501.00731 submitted to Prog. Theor Exp. Phys
Subjects:
Quantum Gases (cond-mat.quant-gas); High Energy Astrophysical Phenomena (astro-ph.HE); Nuclear Theory (nucl-th)
arXiv:
1611.05093 [pdf]
PTEP(2017)·4 citations
07
[Submitted on 16 Nov 2016] (cross-list from cond-mat.mes-hall)
Chiral magnetic plasmons in anomalous relativistic matter
E. V. Gorbar🇺🇦 · V. A. Miransky🇨🇦 · I. A. Shovkovy🇺🇸 · P. O. Sukhachov🇨🇦
The chiral plasmon modes of relativistic matter in background magnetic and strain-induced pseudomagnetic fields are studied in detail using the consistent chiral kinetic theory. The results reveal a number of anomalous features of these chiral magnetic and pseudomagnetic plasmons that could be used to identify them in experiment. In a system with nonzero electric (chiral) chemical potential, the background magnetic (pseudomagnetic) fields not only modify the values of the plasmon frequencies in the long-wavelength limit, but also affect the qualitative dependence on the wave vector. Similar modifications can be also induced by the chiral shift parameter in Weyl materials. Interestingly, even in the absence of the chiral shift and external fields, the chiral chemical potential alone leads to a splitting of plasmon energies at linear order in the wave vector.
Comments:
25 pages, 7 multi-panel figures; published version
Subjects:
Mesoscale and Nanoscale Physics (cond-mat.mes-hall); High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th)
arXiv:
1611.05470 [pdf]
PRB(2017)·36 citations
08
[Submitted on 16 Nov 2016] (cross-list from hep-ph)
Spin-1 diquark contributing to the formation of tetraquarks in light mesons
Hungchong Kim🇰🇷 · Myung-Ki Cheoun🇰🇷 · K. S. Kim🇰🇷
We apply a mixing framework to the light meson systems and examine tetraquark possibility in the scalar channel. In the diquark-antidiquark model, a scalar diquark is a compact object when its color and flavor structures are in ( $3 ˉ_{c}$ , $3 ˉ_{f}$ ). Assuming that all the quarks are in an $S$ -wave, the spin-0 tetraquark formed out of this scalar diquark has only one spin configuration, $∣ J, J_{12}, J_{34} ⟩ = ∣000 ⟩$ , where $J$ is the spin of the tetraquark, $J_{12}$ the diquark spin, $J_{34}$ the antidiquark spin. In this construction of the scalar tetraquark, we notice that another compact diquark with spin-1 in ( $6_{c}$ , $3 ˉ_{f}$ ) can be used although it is less compact than the scalar diquark. The spin-0 tetraquark constructed from this vector diquark leads to the spin configuration $∣ J, J_{12}, J_{34} ⟩ = ∣011 ⟩$ . The two configurations, $∣000 ⟩$ and $∣011 ⟩$ , are found to mix strongly through the color-spin interaction. The physical states can be identified with certain mixtures of the two configurations which diagonalize the hyperfine masses of the color-spin interaction. Matching these states to two scalar resonances $a_{0} (980), a_{0} (1450)$ or to $K_{0}^{*} (800), K_{0}^{*} (1430)$ depending on the isospin channel, we find that their mass splittings are qualitatively consistent with the hyperfine mass splittings which can support their tetraquark structure. To test our mixing scheme further, we also construct the tetraquarks for $J = 1, J = 2$ with the spin configurations, $∣111 ⟩$ and $∣211 ⟩$ , and discuss possible candidates in the physical spectrum.
Comments:
9 pages, no figures, revised slightly
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
1611.05502 [pdf]
EPJC(2017)·17 citations
09
[Submitted on 17 Nov 2016] (cross-list from hep-lat)
Excluded-volume effects for a hadron gas in Yang-Mills theory
Paolo Alba🇩🇪 · Wanda Maria Alberico🇮🇹 · Alessandro Nada🇮🇹 · Marco Panero🇮🇹 · Horst Stöcker🇩🇪
When the multiplicities of particles produced in heavy-ion collisions are fitted to the hadron-resonance-gas model, excluded-volume effects play a significant role. In this work, we study the impact of such effects on the equation of state of pure Yang-Mills theory at low temperatures, comparing the predictions of the statistical model with lattice results. In particular, we present a detailed analysis of the SU(2) and SU(3) Yang-Mills theories: we find that, for both of them, the best fits to the equilibrium thermodynamic quantities are obtained when one assumes that the volume of different glueball states is inversely proportional to their mass. The implications of these findings for QCD are discussed.
Comments:
1+24 pages, 4 pdf figures; v2 (1+23 pages, 4 pdf figures): discussion of the lattice setup shortened, comparison with previous work refined, discussion extended: version published in the journal
Subjects:
High Energy Physics — Lattice (hep-lat); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
1611.05872 [pdf]
PRD(2017)·26 citations
10
[Submitted on 18 Nov 2016] (cross-list from hep-ph)
QCD-inspired determination of NJL model parameters
Paul Springer🇩🇪 · Jens Braun🇩🇪 · Stefan Rechenberger🇩🇪 · Fabian Rennecke🇩🇪
The QCD phase diagram at finite temperature and density has attracted considerable interest over many decades now, not least because of its relevance for a better understanding of heavy-ion collision experiments. Models provide some insight into the QCD phase structure but usually rely on various parameters. Based on renormalization group arguments, we discuss how the parameters of QCD low-energy models can be determined from the fundamental theory of the strong interaction. We particularly focus on a determination of the temperature dependence of these parameters in this work and comment on the effect of a finite quark chemical potential. We present first results and argue that our findings can be used to improve the predictive power of future model calculations.
Comments:
10 pages, 4 figures, Contribution to the proceedings of "XIIth Quark Confinement and the Hadron Spectrum" in Thessaloniki, Greece, Aug 28 - Sep 4, 2016
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
1611.06020 [pdf]
EPJ Web Conf.(2017)·24 citations
11
[Submitted on 18 Nov 2016] (cross-list from astro-ph.HE)
Chiral transport of neutrinos in supernovae
Naoki Yamamoto🇯🇵
The conventional neutrino transport theory for core-collapse supernovae misses one key property of neutrinos: the left-handedness. The chirality of neutrinos modifies the hydrodynamic behavior at the macroscopic scale and leads to topological transport phenomena. We argue that such transport phenomena should play important roles in the evolution of core-collapse supernovae, and, in particular, lead to a tendency toward the inverse energy cascade from small to larger scales, which may be relevant to the origin of the supernova explosion.
Comments:
7 pages, proceedings for the XIIth Quark Confinement and the Hadron Spectrum, Thessaloniki, Greece
Subjects:
High Energy Astrophysical Phenomena (astro-ph.HE); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
1611.06076 [pdf]
EPJ Web Conf.(2017)·5 citations

Affiliations

first authorsco-authorsvia INSPIRE

Condensate of excitations in moving superfluids

Chiral magnetic plasmons in anomalous relativistic matter

Spin-1 diquark contributing to the formation of tetraquarks in light mesons

Excluded-volume effects for a hadron gas in Yang-Mills theory

QCD-inspired determination of NJL model parameters

Chiral transport of neutrinos in supernovae

Affiliations