Nuclear Theory·nucl-th

Monday·March 6, 2017

10 papers—2 primary·8 cross-listed

03
[Submitted on 2 Mar 2017] (cross-list from astro-ph.HE)
Pinning down the superfluid and nuclear equation of state and measuring neutron star mass using pulsar glitches
Wynn C. G. Ho · Cristobal M. Espinoza · Danai Antonopoulou · Nils Andersson
Pulsars are rotating neutron stars that are renowned for their timing precision, although glitches can interrupt the regular timing behavior when these stars are young. Glitches are thought to be caused by interactions between normal and superfluid matter in the star. We update our recent work on a new technique using pulsar glitch data to constrain superfluid and nuclear equation of state models, demonstrating how current and future astronomy telescopes can probe fundamental physics such as superfluidity near nuclear saturation and matter at supranuclear densities. Unlike traditional methods of measuring a star's mass by its gravitational effect on another object, our technique relies on nuclear physics knowledge and therefore allows measurement of the mass of pulsars which are in isolation.
Comments:
4 pages, 4 figures; proceedings of Nuclei in the Cosmos 2016 in Niigata, Japan, S. Kubono (ed.)
Subjects:
High Energy Astrophysical Phenomena (astro-ph.HE); Solar and Stellar Astrophysics (astro-ph.SR); Nuclear Theory (nucl-th)
arXiv:
1703.00932 [pdf]
JPS Conf.Proc.(2017)·7 citations
04
[Submitted on 1 Mar 2017] (cross-list from hep-th)
Vortex solutions in the Abelian Higgs Model with a neutral scalar
Prabal Adhikari🇺🇸 · Jaehong Choi🇺🇸
We construct an extension of the Abelian Higgs model, which consists of a complex scalar field by including an additional real, electromagnetically neutral scalar field. We couple this real scalar field to the complex scalar field via a quartic coupling and investigate $U (1)$ vortex solutions in this "extended Abelian Higgs Model". Since this model has two additional homogeneous ground states, the $U (1)$ vortices that can form in this model have a richer structure than in the Abelian Higgs Model. We also find the "phase diagram" of the model showing the parameter space in which the real scalar particle condenses in the vortex state while having a zero vacuum expectation value in the homogeneous ground state.
Comments:
23 pages, 10 figures, accepted to be published in Acta Polonica B
Subjects:
High Energy Physics — Theory (hep-th); Superconductivity (cond-mat.supr-con); Nuclear Theory (nucl-th)
arXiv:
1703.00961 [pdf]
Acta Phys.Polon.B(2017)·4 citations
05
[Submitted on 3 Mar 2017] (cross-list from hep-ph)
Kaon-Nucleon scattering states and potentials in the Skyrme model
Takashi Ezoe🇯🇵 · Atsushi Hosaka🇯🇵
We study the (anti)kaon nucleon interaction in the Skyrme model. The kaon field is introduced as a fluctuation around the rotating Skyrmion for the nucleon. As an extension of our previous work, we study scattering states and examine phase shifts in various kaon-nucleon channels. Then we study the interaction, where we find that it consists of central and spin-orbit components for isospin channels, $I = 0, 1$ , with energy dependence and nonlocality. The interaction is then fitted to a Shrödinger equivalent local potential for s- and p-waves.
Comments:
25 pages, 33 figures, and 10 tables
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
1703.01004 [pdf]
PRD(2017)·6 citations
06
[Submitted on 3 Mar 2017] (cross-list from hep-ph)
Meson Spectral Functions at Finite Temperature and Isospin Density with Functional Renormalization Group
Ziyue Wang🇨🇳 · Pengfei Zhuang🇨🇳
The pion superfluid and the corresponding Goldstone and soft modes are investigated in two-flavor quark-meson model with functional renormalization group. By solving the flow equations for the effective potential and the meson two-point functions at finite temperature and isospin density, the critical temperature for the superfluid increases sizeably in comparison with solving the flow equation for the potential only. The spectral function for the soft mode shows clearly a transition from meson gas to quark gas with increasing temperature and a crossover from BEC to BCS pairing of quarks with increasing isospin density.
Comments:
14 pages, 7 figures
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
1703.01035 [pdf]
PRD(2017)·34 citations
07
[Submitted on 3 Mar 2017] (cross-list from hep-lat)
Nucleon structure functions from lattice operator product expansion
A.J. Chambers🇦🇺 · R. Horsley🇬🇧 · Y. Nakamura🇯🇵 · H. Perlt🇩🇪 · P.E.L. Rakow🇬🇧 · G. Schierholz🇩🇪 · A. Schiller🇩🇪 · K. Somfleth🇦🇺 · R.D. Young🇦🇺 · J.M. Zanotti🇦🇺
Deep-inelastic scattering, in the laboratory and on the lattice, is most instructive for understanding how the nucleon is built from quarks and gluons. The long-term goal is to compute the associated structure functions from first principles. So far this has been limited to model calculations. In this Letter we propose a new method to compute the structure functions directly from the virtual, all-encompassing Compton amplitude, utilizing the operator product expansion. This overcomes issues of renormalization and operator mixing, which so far have hindered lattice calculations of power corrections and higher moments.
Comments:
10 pages, 6 figures, meets published version (Phys. Rev. Letters)
Subjects:
High Energy Physics — Lattice (hep-lat); High Energy Physics — Experiment (hep-ex); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
1703.01153 [pdf]
PRL(2017)·242 citations
08
[Submitted on 3 Mar 2017] (cross-list from hep-th)
Tree-level correlations in the strong field regime
Francois Gelis🇫🇷
We consider the correlation function of an arbitrary number of local observables in quantum field theory. We show that, at tree level in the strong field regime, these correlations arise solely from fluctuations in the initial state. We obtain the general expression of these correlation functions in terms of the classical solution of the field equation of motion and its derivatives with respect to its initial conditions, that can be arranged graphically as the sum of labeled trees where the nodes are the individual observables, and the links are pairs of derivatives acting on them. For 3-point (and higher) correlation functions, there are additional tree-level terms beyond from the strong field approximation, generated throughout the evolution of the system.
Comments:
37 pages
Subjects:
High Energy Physics — Theory (hep-th); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
1703.01227 [pdf]
JHEP(2017)·0 citations
09
[Submitted on 3 Mar 2017] (cross-list from hep-ph)
Can X(3915) be the tensor partner of the X(3872)?
V. Baru🇩🇪 · C. Hanhart🇩🇪 · A.V. Nefediev🇷🇺
It has been proposed recently (Phys. Rev. Lett. 115 (2015), 022001) that the charmoniumlike state named X(3915) and suggested to be a $0^{++}$ scalar, is just the helicity-0 realisation of the $2^{++}$ tensor state $χ_{c 2} (3930)$ . This scenario would call for a helicity-0 dominance, which were at odds with the properties of a conventional tensor charmonium, but might be compatible with some exotic structure of the $χ_{c 2} (3930)$ . In this paper, we investigate, if such a scenario is compatible with the assumption that the $χ_{c 2} (3930)$ is a $D^{*} D ˉ^{*}$ molecular state - a spin partner of the $X (3872)$ treated as a shallow bound state. We demonstrate that for a tensor molecule the helicity-0 component vanishes for vanishing binding energy and accordingly for a shallow bound state a helicity-2 dominance would be natural. However, for the $χ_{c 2} (3930)$ , residing about 100 MeV below the $D^{*} D ˉ^{*}$ threshold, there is no a priori reason for a helicity-2 dominance and thus the proposal formulated in the above mentioned reference might indeed point at a molecular structure of the tensor state. Nevertheless, we find that the experimental data currently available favour a dominant contribution of the helicity-2 amplitude also in this scenario, if spin symmetry arguments are employed to relate properties of the molecular state to those of the X(3872). We also discuss what research is necessary to further constrain the analysis.
Comments:
LaTeX2e, 23 pages, 2 figures, version to appear in JHEP
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Theory (nucl-th)
arXiv:
1703.01230 [pdf]
JHEP(2017)·20 citations
10
[Submitted on 3 Mar 2017] (cross-list from hep-ex)
Dipole polarizabilities of charged pions
L.V. Fil'kov🇷🇺 · V.L. Kashevarov🇷🇺
We discuss main experimental works, where dipole polarizabilities of charged pions have been determined. Possible reasons for the differences between the experimental data are discussed. In particular, it is shown that the account of the $σ$ -meson gives a significant correction to the value of the polarizability obtained in the latest experiment of the COMPASS collaboration.
Comments:
7 pages, 2 figures
Subjects:
High Energy Physics — Experiment (hep-ex); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
1703.01233 [pdf]
Phys.Part.Nucl.(2017)·8 citations

Affiliations

first authorsco-authorsvia INSPIRE