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Nuclear Theory·nucl-th

Thursday·June 28, 2018

8 papers—6 primary·2 cross-listed

All8Primary6Cross-lists2
  1. 07

    Application of the functional renormalization group to Bose gases: from linear to hydrodynamic fluctuations

    Felipe Isaule🇬🇧 · Michael C. Birse🇬🇧 · Niels R. Walet🇬🇧

    We study weakly interacting Bose gases using the functional renormalization group with a hydrodynamic effective action. We use a scale-dependent parametrization of the boson fields that interpolates between a Cartesian representation at high momenta and an amplitude-phase one for low momenta. We apply this to Bose gases in two and three dimensions near the superfluid phase transition where they can be described by statistical O(2) models. We are able to give consistent physical descriptions of the infrared regime in both two and three dimensions. In particular, and in contrast to previous studies using the functional renormalization group, we find a stable superfluid phase at finite temperatures in two dimensions. We compare our results for the superfluid and boson densities with Monte-Carlo simulations, and we find they are in reasonable agreement.

    ↳ cond-mat.quant-gasnucl-thphysics.atom-phPRB(2018)·12 citations
  2. 08

    On operator relations for gravitational form factors of a spin-0 hadron

    Kazuhiro Tanaka (Juntendo Univ.)🇯🇵

    The gravitational form factors for a hadron, the form factors for the hadron matrix element of the QCD energy-momentum tensor, not only describe the coupling of the hadron with a graviton, but also serve as unique quantities for describing the shape inside the hadron reflecting dynamics of quarks and gluons, such as the internal shear forces acting on the quarks/gluons and their pressure distributions. We consider the quark contribution to the gravitational form factors for a (pseudo)scalar hadron, and derive and clarify the relations satisfied by them as direct consequences of the symmetries and the equations of motion in QCD, and connections to the generalized parton distributions. Our results reveal the connections between the gravitational form factors and the higher-twist quark-gluon correlation effects inside the hadrons.

    ↳ hep-phhep-exnucl-thPRD(2018)·66 citations

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