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Nuclear Theory·nucl-th

Wednesday·February 4, 2015

7 papers—5 primary·2 cross-listed

All7Primary5Cross-lists2
  1. 06

    [Submitted on 21 Jul 2014] (cross-list from cond-mat.quant-gas)

    Pairing in Asymmetric Many-Fermion Systems: Functional Renormalisation Group Approach

    Boris Krippa🇬🇧

    Functional renormalisation group approach is applied to a imbalanced many- fermion system with a short-range attractive force. Composite boson field is introduced to describe the pairing between different flavour fermions. A set of approximate flow equations for the effective couplings is derived and solved. We identify the critical values of mass and particle number density mismatch when the system undergoes a phase transition to a normal state and determine the phase diagram both at unitary regime and nearby.

    Comments:
    some discussion and references added
    Subjects:
    Quantum Gases (cond-mat.quant-gas); Superconductivity (cond-mat.supr-con); Nuclear Theory (nucl-th)
    arXiv:
    1407.5438 [pdf]
    PLB(2015)·10 citations
  2. 07

    [Submitted on 3 Feb 2015] (cross-list from hep-ph)

    Thermodynamics and fluctuations of conserved charges in Hadron Resonance Gas model in finite volume

    Abhijit Bhattacharyya🇮🇳 · Rajarshi Ray🇮🇳 · Subhasis Samanta🇮🇳 · Subrata Sur

    The thermodynamics of hot and dense matter created in heavy-ion collision experiments are usually studied as a system of infinite volume. Here we report on possible effects for considering a finite system size for such matter in the framework of the Hadron Resonance Gas model. The bulk thermodynamic variables as well as the fluctuations of conserved charges are considered. We find that the finite size effects are insignificant once the observables are scaled with the respective volumes. The only substantial effect is found in the fluctuations of electric charge which may therefore be used to extract information about the volume of fireball created in heavy-ion collision experiments.

    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1502.00889 [pdf]
    PRC(2015)·68 citations

Affiliations

first authorsco-authorsvia INSPIRE