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Nuclear Theory·nucl-th

Monday·January 25, 2016

4 papers—1 primary·3 cross-listed

All4Primary1Cross-lists3
  1. 02

    Much ado about Zero

    Asis Kumar Chaudhuri

    A brief historical introduction for the enigmatic number Zero is given. The discussions are for popular consumption.

    ↳ math.HOhep-phnucl-exnucl-th+10 citations
  2. 03

    Scaling properties of the mean multiplicity and pseudorapidity density in , +p, p()+p, p+A and A+A(B) collisions

    Roy A. Lacey (1,2)🇺🇸 · Peifeng Liu (2)🇺🇸 · Niseem Magdy (1)🇺🇸 · M.Csanád (1,3)🇺🇸 · B. Schweid (2)🇺🇸 · N. N. Ajitanand (1)🇺🇸 · J. Alexander (1)🇺🇸 · R. Pak (4) ((1) Department of Chemistry, Stony Brook University, Stony Brook, NY, USA (2) Dept. of Physics, Stony Brook University, Stony Brook, NY, USA (3) Eotvos University, Department of Atomic Physics, Budapest, Hungary (4) Brookhaven National Laboratory, Upton, New York, USA)🇺🇸

    The pseudorapidity density (dN/deta) for p+p, p+A and A+A(B) collisions, and the mean multiplicity <Nch> for ee, ep, and p+p collisions, are studied for an inclusive range of beam energies (Root_s). Characteristic scaling patterns are observed for both dN/deta and <Nch>, consistent with a thermal particle production mechanism for the bulk of the soft particles produced in all of these systems. They also validate an essential role for quark participants in these collisions. The scaled values for dN/deta and <Nch> are observed to factorize into contributions which depend on log(Root_s) and the number of nucleon or quark participant pairs (Npp). Quantification of these contributions give expressions which serve to systematize dN/deta and <Nch> measurements spanning nearly four orders of magnitude in Root_s, and to predict their values as a function of Root_s and Npp.

    ↳ nucl-exhep-exhep-phnucl-thUniverse(2018)·36 citations
  3. 04

    Fast spinning strange stars: possible ways to constrain interacting quark matter parameters

    Sudip Bhattacharyya (TIFR, India)🇮🇳 · Ignazio Bombaci (Universita di Pisa / INFN / EGO, Italy)🇮🇹 · Domenico Logoteta (INFN, Italy)🇮🇹 · Arun V. Thampan (St. Joseph's College / IUCAA, India)🇮🇳

    For a set of equation of state (EoS) models involving interacting strange quark matter, characterized by an effective bag constant (B_eff) and a perturbative QCD corrections term (a_4), we construct fully general relativistic equilibrium sequences of rapidly spinning strange stars for the first time. Computation of such sequences is important to study millisecond pulsars and other fast spinning compact stars. Our EoS models can support a gravitational mass (M_G) and a spin frequency at least up to approximately 3.0 solar mass and approximately 1250 Hz respectively, and hence are fully consistent with measured M_G and spin frequency values. This paper reports the effects of B_eff and a_4 on measurable compact star properties, which could be useful to find possible ways to constrain these fundamental quark matter parameters, within the ambit of our EoS models. We confirm that a lower B_eff allows a higher mass. Besides, for known M_G and spin frequency, measurable parameters, such as stellar radius, radius-to-mass ratio and moment of inertia, increase with the decrease of B_eff. Our calculations also show that a_4 significantly affects the stellar rest mass and the total stellar binding energy. As a result, a_4 can have signatures in evolutions of both accreting and non-accreting compact stars, and the observed distribution of stellar mass and spin and other source parameters. Finally, we compute the parameter values of two important pulsars, PSR J1614-2230 and PSR J1748-2446ad, which may have implications to probe their evolutionary histories, and for constraining EoS models.

    ↳ astro-ph.HEastro-ph.SRgr-qcnucl-thMNRAS(2016)·53 citations

Affiliations

first authorsco-authorsvia INSPIRE