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Nuclear Theory·nucl-th

Friday·July 28, 2017

9 papers—6 primary·3 cross-listed

All9Primary6Cross-lists3
  1. 07

    Ground-state properties of unitary bosons: from clusters to matter

    J. Carlson🇺🇸 · S. Gandolfi🇺🇸 · U. van Kolck🇫🇷 · S. A. Vitiello🇧🇷

    The properties of cold Bose gases at unitarity have been extensively investigated in the last few years both theoretically and experimentally. In this paper we use a family of interactions tuned to two-body unitarity and very weak three-body binding to demonstrate the universal properties of both clusters and matter. We determine the universal properties of finite clusters up to 60 particles and, for the first time, explicitly demonstrate the saturation of energy and density with particle number and compare with bulk properties. At saturation in the bulk we determine the energy, density, two- and three-body contacts and the condensate fraction. We find that uniform matter is more bound than three-body clusters by nearly two orders of magnitude, the two-body contact is very large in absolute terms, and yet the condensate fraction is also very large, greater than 90%. Equilibrium properties of these systems may be experimentally accessible through rapid quenching of weakly-interacting boson superfluids.

    ↳ cond-mat.quant-gasnucl-thphysics.atm-clusquant-phPRL(2017)·34 citations
  2. 08

    Sanity check for bound states in lattice QCD with Lüscher's finite volume formula -- Exposing Symptoms of Fake Plateaux --

    Sinya Aoki🇯🇵 · Takumi Doi🇯🇵 · Takumi Iritani🇯🇵

    A sanity check rules out certain types of obviously false results, but does not catch every possible error. After reviewing such a sanity check for bound states with the Lüscher's finite volume formula[1-3], we give further evidences for the operator dependence of plateaux, a symptom of the fake plateau problem, against the claim in [4]. We then present our critical comments on [5] by NPLQCD: (i) Operator dependences of plateaux in NPL2013[6,7] exist with the -values of 4--5%. (ii) The volume independence of plateaux in NPL2013 does not prove their correctness. (iii) Effective range expansion (ERE) fits in NPL2013 violate the physical pole condition. (iv) Ref.[5] is partly based on new data and analysis different from the original ones[6,7]. (v) A new ERE in Refs.[5,8] does not satisfy the Lüscher's finite volume formula. [1] T. Iritani et al., JHEP 10 (2016) 101. [2] S. Aoki et al., PoS (LATTICE2016) 109. [3] T. Iritani et al., 1703.0720. [4] T. Yamazaki et al., PoS (LATTICE2017) 108. [5] S.R. Beane et al., 1705.09239. [6] S.R. Beane et al., PRD87 (2013) 034506. [7] S.R. Beane et al., PRC88 (2013) 024003. [8] M.L. Wagman et al., 1706.06550.

    ↳ hep-latnucl-thEPJ Web Conf.(2018)·21 citations
  3. 09

    Holographic constraints on Bjorken hydrodynamics at finite coupling

    Brandon S. DiNunno🇺🇸 · Sašo Grozdanov🇳🇱 · Juan F. Pedraza🇳🇱 · Steve Young🇺🇸

    In large- conformal field theories with classical holographic duals, inverse coupling constant corrections are obtained by considering higher-derivative terms in the corresponding gravity theory. In this work, we use type IIB supergravity and bottom-up Gauss-Bonnet gravity to study the dynamics of boost-invariant Bjorken hydrodynamics at finite coupling. We analyze the time-dependent decay properties of non-local observables (scalar two-point functions and Wilson loops) probing the different models of Bjorken flow and show that they can be expressed generically in terms of a few field theory parameters. In addition, our computations provide an analytically quantifiable probe of the coupling-dependent validity of hydrodynamics at early times in a simple model of heavy-ion collisions, which is an observable closely analogous to the hydrodynamization time of a quark-gluon plasma. We find that to third order in the hydrodynamic expansion, the convergence of hydrodynamics is improved and that generically, as expected from field theory considerations and recent holographic results, the applicability of hydrodynamics is delayed as the field theory coupling decreases.

    ↳ hep-thgr-qchep-phnucl-thJHEP(2017)·21 citations

Affiliations

first authorsco-authorsvia INSPIRE