PaperPanorama
FAQ

Nuclear Theory·nucl-th

Friday·July 10, 2015

6 papers—3 primary·3 cross-listed

All6Primary3Cross-lists3
  1. 04

    Photon emission in neutral current interactions at the T2K experiment

    E. Wang🇨🇳 · L. Alvarez-Ruso🇪🇸 · Y. Hayato🇯🇵 · K. Mahn🇺🇸 · J. Nieves🇪🇸

    We have applied a microscopic model for single photon emission in neutral current interactions on nucleons and nuclei to determine the number and distributions of such events at the Super-Kamiokande detector, for the flux and beam exposure of the T2K experiment in neutrino mode. These reactions represent an irreducible background in electron-(anti)neutrino appearance measurements aimed at a precise measurement of mixing angle and the violating phase. We have obtained a total number of photon events that is twice larger than the one from the NEUT event generator (version 5.1.4.2) used in the analysis of T2K data. Detailed comparisons of energy and angular distributions for the and fluxes have also been performed.

    ↳ hep-phhep-exnucl-thPRD(2015)·26 citations
  2. 05

    Constructing higher-order hydrodynamics: The third order

    Sašo Grozdanov🇳🇱 · Nikolaos Kaplis🇳🇱

    Hydrodynamics can be formulated as the gradient expansion of conserved currents in terms of the fundamental fields describing the near-equilibrium fluid flow. In the relativistic case, the Navier-Stokes equations follow from the conservation of the stress-energy tensor to first order in derivatives. In this paper, we go beyond the presently understood second-order hydrodynamics and discuss the systematisation of obtaining the hydrodynamic expansion to an arbitrarily high order. As an example of the algorithm that we present, we fully classify the gradient expansion at third order for neutral fluids in four dimensions, thus finding the most general next-to-leading-order corrections to the relativistic Navier-Stokes equations in curved space-time. In doing so, we list new transport coefficient candidates in the conformal and in the non-conformal case. As we do not consider any constraints that could potentially arise from the local entropy current analysis, this is the maximal possible set of neutral third-order transport coefficients. To investigate the physical implications of these new transport coefficients, we obtain the third-order corrections to the linear dispersion relations that describe the propagation of diffusion and sound waves in relativistic fluids. We also compute the corrections to the scalar (spin-) two-point correlation function of the third-order stress-energy tensor. Furthermore, as an example of a non-linear hydrodynamic flow, we calculate the third-order corrections to the energy density of a boost-invariant Bjorken flow. Finally, we apply our field theoretic results to the supersymmetric Yang-Mills fluid at infinite 't Hooft coupling and infinite number of colours to find the values of five new linear combinations of the conformal transport coefficients.

    ↳ hep-thhep-phnucl-thphysics.flu-dynPRD(2016)·109 citations
  3. 06

    Universal hydrodynamic flow in holographic planar shock collisions

    Paul M. Chesler🇺🇸 · Niki Kilbertus🇩🇪 · Wilke van der Schee🇺🇸

    We study the collision of planar shock waves in AdS as a function of shock profile. In the dual field theory the shock waves describe planar sheets of energy whose collision results in the formation of a plasma which behaves hydrodynamically at late times. We find that the post-collision stress tensor near the light cone exhibits transient non-universal behavior which depends on both the shock width and the precise functional form of the shock profile. However, over a large range of shock widths, including those which yield qualitative different behavior near the future light cone, and for different shock profiles, we find universal behavior in the subsequent hydrodynamic evolution. Additionally, we compute the rapidity distribution of produced particles and find it to be well described by a Gaussian.

    ↳ hep-thgr-qchep-phnucl-thJHEP(2015)·43 citations

Affiliations

first authorsco-authorsvia INSPIRE