Nuclear Theory·nucl-th

Tuesday·October 24, 2017

22 papers—15 primary·7 cross-listed

16
[Submitted on 20 Oct 2017] (cross-list from cond-mat.supr-con)
Topology and symmetry of surface Majorana arcs in cyclic superconductors
Takeshi Mizushima · Muneto Nitta
We study the topology and symmetry of surface Majorana arcs in superconductors with nonunitary "cyclic" pairing. Cyclic $p$ -wave pairing may be realized in a cubic or tetrahedral crystal, while it is a candidate for the interior $^{3} P_{2}$ superfluids of neutron stars. The cyclic state is an admixture of full gap and nodal gap with eight Weyl points and the low-energy physics is governed by itinerant Majorana fermions. We here show the evolution of surface states from Majorana cone to Majorana arcs under rotation of surface orientation. The Majorana cone is protected solely by an accidental spin rotation symmetry and fragile against spin-orbit coupling, while the arcs are attributed to two topological invariants: the first Chern number and one-dimensional winding number. Lastly, we discuss how topologically protected surface states inherent to the nonunitary cyclic pairing can be captured from surface probes in candidate compounds, such as U $_{1 - x}$ Th $_{x}$ Be $_{13}$ . We examine tunneling conductance spectra for two competitive scenarios in U $_{1 - x}$ Th $_{x}$ Be $_{13}$ ---the degenerate $E_{u}$ scenario and the accidental scenario.
Comments:
15 pages, 11 figures
Subjects:
Superconductivity (cond-mat.supr-con); Nuclear Theory (nucl-th)
arXiv:
1710.07403 [pdf]
PRB(2018)·19 citations
17
[Submitted on 20 Oct 2017] (cross-list from astro-ph.HE)
Modeling GW170817 based on numerical relativity and its implications
Masaru Shibata🇯🇵 · Sho Fujibayashi🇯🇵 · Kenta Hotokezaka🇯🇵 · Kenta Kiuchi🇯🇵 · Koutarou Kyutoku🇯🇵 · Yuichiro Sekiguchi🇯🇵 · Masaomi Tanaka🇯🇵
Gravitational-wave observation together with a large number of electromagnetic observations shows that the source of the latest gravitational-wave event, GW170817, detected primarily by advanced LIGO, is the merger of a binary neutron star. We attempt to interpret this observational event based on our results of numerical-relativity simulations performed so far paying particular attention to the optical and infra-red observations. We finally reach a conclusion that this event is described consistently by the presence of a long-lived hypermassive or supramassive neutron star as the merger remnant, because (i) significant contamination by lanthanide elements along our line of sight to this source can be avoided by the strong neutrino irradiation from it and (ii) it could play a crucial role to produce an ejecta component of appreciable mass with fast motion in the post-merger phase. We also point out that (I) the neutron-star equation of state has to be sufficiently stiff (i.e., the maximum mass of cold spherical neutron stars, M_max, has to be appreciably higher than 2M_sun in order that a long-lived massive neutron star can be formed as the merger remnant for the binary systems of GW170817, for which the initial total mass is >~ 2.73M_sun and (II) no detection of relativistic optical counterpart suggests a not-extremely high value of M_max approximately as 2.15-2.25M_sun.
Comments:
21 pages, 6 figures, accepted for publication in Phys. Rev. D
Subjects:
High Energy Astrophysical Phenomena (astro-ph.HE); General Relativity and Quantum Cosmology (gr-qc); Nuclear Theory (nucl-th)
arXiv:
1710.07579 [pdf]
PRD(2017)·465 citations
18
[Submitted on 21 Oct 2017] (cross-list from cond-mat.quant-gas)
Two-point momentum correlations of few ultracold quasi-one-dimensional trapped fermions: Diffraction patterns
Benedikt B. Brandt · Constantine Yannouleas · Uzi Landman
Spatial and momentum correlations are important in the analysis of the quantum states and different phases of trapped ultracold atom systems as a function of the strength of interatomic interactions. Identification and understanding of spin-resolved patterns exhibited in two-point correlations, accessible directly by experiments, are key for uncovering the symmetry and structure of the many-body wave functions of the trapped system. Using the configuration interaction method for exact diagonalization of the many-body Hamiltonian of $N = 2 - 4$ fermionic atoms trapped in single, double, triple, and quadruple wells, we analyze both two-point momentum and space correlations, as well as associated noise distributions, for a broad range of interparticle contact repulsion strengths and interwell separations, unveiling characteristics allowing insights into the transition, via an intermediate phase, from the non-interacting Bose-Einstein condensate to the weakly interacting quasi-Bose-Einstein regime, and from the latter to the strong-repulsion Tonks-Girardeau (TG) one. The ab-initio numerical predictions are shown to agree well with the results of a constructed analytical model employing localized displaced Gaussian functions to represent the $N$ fermions. The two-point momentum correlations are found to exhibit damped oscillatory diffraction behavior. This diffraction behavior develops fully for atoms trapped in a single well with strong interatomic repulsion in the TG regime, or for atoms in well-separated multi-well traps. Additionally, the two-body momentum correlation and noise distributions are found to exhibit "shortsightedness", with the main contribution coming from nearest-neighboring particles.
Comments:
Published extended version. 19 pages, 14 color figures. For related papers, see http://www.prism.gatech.edu/~ph274cy/
Subjects:
Quantum Gases (cond-mat.quant-gas); Nuclear Theory (nucl-th); Quantum Physics (quant-ph)
arXiv:
1710.07853 [pdf]
PRA(2017)·11 citations
19
[Submitted on 22 Oct 2017] (cross-list from nucl-ex)
Beta decays in investigations and searches for rare effects
V.I. Tretyak🇺🇦
Current status of experimental investigations of rare single beta decays (48Ca, 50V, 96Zr, 113Cd, 113mCd, 115In, 123Te, 180mTa, 222Rn) is reviewed. Nuclei which decay through single beta decay very often constitute backgrounds in studies of rare effects like double beta decay, solar neutrinos or dark matter. Summary of correction factors used in description of forbidden beta decays is also briefly given.
Comments:
4 pages, contribution to the MEDEX'2017 conference, one more acknowledgment added
Subjects:
Nuclear Experiment (nucl-ex); Instrumentation and Methods for Astrophysics (astro-ph.IM); Nuclear Theory (nucl-th)
arXiv:
1710.08035 [pdf]
AIP Conf.Proc.(2017)·3 citations
20
[Submitted on 20 Oct 2017] (cross-list from hep-ph)
Magnetic moments of the spin- $\frac{3}{2}$ doubly heavy baryons
Lu Meng🇨🇳 · Hao-Song Li🇨🇳 · Zhan-Wei Liu🇨🇳 · Shi-Lin Zhu🇨🇳
In this work, we investigate the chiral corrections to the magnetic moments of the spin- $\frac{3}{2}$ doubly charmed baryons systematically up to next-to-next-to-leading order with the heavy baryon chiral perturbation theory. The numerical results are given up to next-to-leading order: $μ_{Ξ_{cc}^{*++}} = 1.72 μ_{N}$ , $μ_{Ξ_{cc}^{*+}} = - 0.09 μ_{N}$ , $μ_{Ω_{cc}^{*+}} = 0.99 μ_{N}$ . As a by-product, we have also calculated the magnetic moments of the spin- $\frac{3}{2}$ doubly bottom baryons and charmed bottom baryons: $μ_{Ξ_{bb}^{* 0}} = 0.63 μ_{N}$ , $μ_{Ξ_{bb}^{*-}} = - 0.79 μ_{N}$ , $μ_{Ω_{bb}^{*-}} = 0.12 μ_{N}$ , $μ_{Ξ_{b c}^{*+}} = 1.12 μ_{N}$ , $μ_{Ξ_{b c}^{* 0}} = - 0.40 μ_{N}$ , $μ_{Ω_{b c}^{* 0}} = 0.56 μ_{N}$ .
Comments:
10 pages,2 figures. arXiv admin note: text overlap with arXiv:1707.02765. Replace the published version
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); High Energy Physics — Lattice (hep-lat); Nuclear Theory (nucl-th)
arXiv:
1710.08283 [pdf]
EPJC(2017)·44 citations
21
[Submitted on 20 Oct 2017] (cross-list from hep-lat)
Parton distribution functions on the lattice and in the continuum
Joseph Karpie🇺🇸 · Kostas Orginos🇺🇸 · Anatoly Radyushkin🇺🇸 · Savvas Zafeiropoulos🇩🇪
Ioffe-time distributions, which are functions of the Ioffe-time $ν$ , are the Fourier transforms of parton distribution functions with respect to the momentum fraction variable $x$ . These distributions can be obtained from suitable equal time, quark bilinear hadronic matrix elements which can be calculated from first principles in lattice QCD, as it has been recently argued. In this talk I present the first numerical calculation of the Ioffe-time distributions of the nucleon in the quenched approximation.
Comments:
8 pages, 10 figures. arXiv admin note: text overlap with arXiv:1706.05373
Subjects:
High Energy Physics — Lattice (hep-lat); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
1710.08288 [pdf]
EPJ Web Conf.(2018)·42 citations
22
[Submitted on 23 Oct 2017] (cross-list from hep-ph)
Masses and decay widths of scalar $D_{0}$ and $D_{s 0}$ mesons in strange hadronic medium
Rahul Chhabra🇮🇳 · Arvind Kumar🇮🇳
Masses and decay constants of scalar $D_{0}$ and $D_{s 0}$ mesons in isospin asymmetric strange hadronic matter at finite temperature are evaluated using QCD sum rules and chiral SU(3) model. In-medium light quark condensates, $⟨ u ˉ u ⟩_{ρ_{B}}$ and $⟨ d ˉ d ⟩_{ρ_{B}}$ , the strange quark condensates, $⟨ s ˉ s ⟩_{ρ_{B}}$ , and the gluon condensates, $⟨ \frac{α _{s}}{π} G^{a}_{μν} G^{a}^{μν} ⟩_{ρ_{B}}$ , needed in QCD sum rule calculations are evaluated using chiral SU(3) model. As an application, we calculate the in-medium partial decay width of scalar $D_{0}$ ( $D_{s 0}$ ) meson decaying to $D$ + $π$ ( $D_{s}$ + $π$ ) pseudoscalar mesons using $^{3} P_{0}$ model. The medium effects in their decay widths are assimilated through the modification in the masses of these mesons. These results may be helpful to understand the possible outcomes of the future experiments like CBM and PANDA under the FAIR facility where the study of charmed hadrons is one of major goal.
Comments:
28 pages, 8 figures
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
1710.08320 [pdf]
PRC(2018)·9 citations

Affiliations

first authorsco-authorsvia INSPIRE

Topology and symmetry of surface Majorana arcs in cyclic superconductors

Modeling GW170817 based on numerical relativity and its implications

Two-point momentum correlations of few ultracold quasi-one-dimensional trapped fermions: Diffraction patterns

Beta decays in investigations and searches for rare effects

Magnetic moments of the spin-23​ doubly heavy baryons

Parton distribution functions on the lattice and in the continuum

Masses and decay widths of scalar D0​ and Ds0​ mesons in strange hadronic medium

Affiliations

Magnetic moments of the spin- $\frac{3}{2}$ doubly heavy baryons

Masses and decay widths of scalar $D_{0}$ and $D_{s 0}$ mesons in strange hadronic medium