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Nuclear Theory·nucl-th

Tuesday·January 23, 2018

10 papers—6 primary·4 cross-listed

All10Primary6Cross-lists4
  1. 07

    Dynamical AdS/Yang-Mills Model

    Sean P. Bartz🇨🇦 · Aditya Dhumuntarao🇺🇸 · Joseph I. Kapusta🇺🇸

    The AdS/CFT correspondence has provided new and useful insights into the nonperturbative regime of strongly coupled gauge theories. We construct a class of models meant to mimic Yang-Mills theory using the superpotential method. This method allows us to efficiently address the problem of solving all the equations of motion. The conformal symmetry is broken in the infrared by a dilaton field. Using a five-dimensional action we calculate the mass spectrum of scalar glueballs. This spectrum contains a tachyon, indicating an instability in the theory. We stabilize the theory by introducing a cosmological constant in the bulk and a pair of 3-branes, as in the Randall-Sundrum model. The scalar glueball masses computed by lattice gauge theory are then described very well by just a few parameters. Prospects for extending the model to other spins and parities and to finite temperature are considered.

    ↳ hep-thnucl-thPRD(2018)·13 citations
  2. 08

    Internal Plateau in Short GRBs and Quark Stars

    A. Li🇨🇳

    I summarize our recent calculations on quark stars (QSs), for the purpose of explaining some short gamma-ray bursts characterized by internal plateau in their early X-ray afterglow. According to the present plateau sample, the QS central engine model is demonstrated to more preferred than the original neutron star (NS) one. New QS equation of states (PMQS1, PMQS2, PMQS3) are then proposed, respecting fully the observed burst data and the mass distribution of the Galactic NS-NS systems.

    ↳ astro-ph.HEastro-ph.SRnucl-thJPS Conf.Proc.(2018)·1 citation
  3. 09

    Chiral symmetry breaking and monopoles in gauge theories

    Adith Ramamurti🇺🇸 · Edward Shuryak🇺🇸

    QCD monopoles are magnetically charged quasiparticles whose Bose-Einstein condensation (BEC) at creates electric confinement and flux tubes. The "magnetic scenario" of QCD proposes that scattering on the non-condensed component of the monopole ensemble at plays an important role in explaining the properties of strongly coupled quark-gluon plasma (sQGP) near the deconfinement temperature. In this paper, we study the phenomenon of chiral symmetry breaking and its relation to magnetic monopoles. Specifically, we study the eigenvalue spectrum of the Dirac operator in the basis of fermionic zero modes in an SU(2) monopole background. We find that as the temperature approaches the deconfinement temperature from above, the eigenvalue spectrum has a finite density at , indicating the presence of a chiral condensate. In addition, we find the critical scaling of the eigenvalue gap to be consistent with that of the correlation length in the 3d Ising model and the BEC transition of monopoles on the lattice.

    ↳ hep-phnucl-thPRD(2019)·6 citations
  4. 10

    Investigation of complete and incomplete fusion in Li+Sn reaction around Coulomb barrier energies

    V. V. Parkar · Sushil K. Sharma · R. Palit · S. Upadhyaya · A. Shrivastava · S. K. Pandit · K. Mahata · V. Jha · S. Santra · K. Ramachandran · T. N. Nag · P. K. Rath · Bhushan Kanagalekar · T. Trivedi

    The complete and incomplete fusion cross sections for Li+Sn reaction were measured using online and offline characteristic -ray detection techniques. The complete fusion (CF) cross sections at energies above the Coulomb barrier were found to be suppressed by 26 \% compared to the coupled channel calculations. This suppression observed in complete fusion cross sections is found to be commensurate with the measured total incomplete fusion (ICF) cross sections. There is a distinct feature observed in the ICF cross sections, i.e., -capture is found to be dominant than -capture at all the measured energies. A simultaneous explanation of complete, incomplete and total fusion (TF) data was also obtained from the calculations based on Continuum Discretized Coupled Channel method with short range imaginary potentials. The cross section ratios of CF/TF and ICF/TF obtained from the data as well as the calculations showed the dominance of ICF at below barrier energies and CF at above barrier energies.

    ↳ nucl-exnucl-thPRC(2018)·42 citations

Affiliations

first authorsco-authorsvia INSPIRE