PaperPanorama
FAQ

Nuclear Theory·nucl-th

Friday·May 24, 2019

8 papers—4 primary·4 cross-listed

All8Primary4Cross-lists4
  1. 05

    Analytic Transport from Weak to Strong Coupling in the O(N) model

    Paul Romatschke🇺🇸

    In this work, a second-order transport coefficient (the curvature-matter coupling ) is calculated exactly for the 3+1d O(N) model at large N for any coupling value. Since the theory is `trivial' in the sense of possessing a Landau pole, the result for only is free from cut-off artifacts much below the Landau pole in the effective field theory sense. Nevertheless, this leaves a large range of coupling values where this transport coefficient can be determined non-perturbatively and analytically with little ambiguity. Along with thermodyamic results also calculated in this work, I expect exact large N results to provide good quantitative predictions for N=1 scalar field theory with interaction.

    ↳ hep-thcond-mat.str-elhep-phnucl-thPRD(2019)·19 citations
  2. 06

    Estimation of attractive and repulsive interactions from the fluctuation observables at RHIC using van der Waals hadron resonance gas Model

    Subhasis Samanta🇮🇳 · Bedangadas Mohanty🇮🇳

    Experimental data on the moments of net-proton distribution in central Au-Au collisions for various center of mass energies () measured by the STAR collaboration at the Relativistic Heavy-Ion Collider (RHIC) are compared to the corresponding results from a van der Waals type interacting hadron resonance gas (VDWHRG) model. The parameters representing the attractive and repulsive interactions in the VDWHRG model have been extracted by fitting the /, and , where is the mean, is the standard deviation, is the skewness and the kurtosis of the net-proton distribution. Considering all the three moment products we observe that the strength of the repulsive interactions increases with decrease in = 200 to 19.6 GeV while the strength of the attractive interaction is of the similar magnitude. For = 11.5 and 7.7 GeV there is drop in the strength of both attractive and repulsive interactions relative to = 19.6 GeV. On the other hand, if we consider only the higher order moment products, and , which are more sensitive to critical point physics, a segregation with respect to the strength of the attractive parameter is observed. The data for = 19.6 and 27 GeV supports a larger attractive strength compared to other energies. For this latter case, the repulsive interaction values are of similar order for most of the beam energies studied, except for 7.7 GeV where the parameter value is not well constrained due to large uncertainties.

    ↳ hep-phnucl-th2 citations
  3. 07

    Discovery of an Exceptionally Strong -Decay Transition of F and Implications for the Fate of Intermediate-Mass Stars

    O. S. Kirsebom · S. Jones · D. F. Strömberg · G. Martínez-Pinedo · K. Langanke · F. K. Roepke · B. A. Brown · T. Eronen · H. O. U. Fynbo · M. Hukkanen · A. Idini · A. Jokinen and 12 other authors

    A significant fraction of stars between 7-11 solar masses are thought to become supernovae, but the explosion mechanism is unclear. The answer depends critically on the rate of electron capture on Ne in the degenerate oxygen-neon stellar core. However, due to the unknown strength of the transition between the ground states of Ne and F, it has not previously been possible to fully constrain the rate. By measuring the transition, we have established that its strength is exceptionally large and enhances the capture rate by several orders of magnitude. This has a decisive impact on the evolution of the core, increasing the likelihood that the star is (partially) disrupted by a thermonuclear explosion rather than collapsing to form a neutron star. Importantly, our measurement resolves the last remaining nuclear physics uncertainty in the final evolution of degenerate oxygen-neon stellar cores, allowing future studies to address the critical role of convection, which at present is poorly understood.

    ↳ astro-ph.SRastro-ph.HEnucl-exnucl-thPRL(2019)·48 citations
  4. 08

    A qubit model for U(1) lattice gauge theory

    Randy Lewis🇨🇦 · R. M. Woloshyn🇨🇦

    A conceptually simple model for strongly interacting compact U(1) lattice gauge theory is expressed as operators acting on qubits. The number of independent gauge links is reduced to its minimum through the use of Gauss's law. The model can be implemented with any number of qubits per gauge link, and a choice as small as two is shown to be useful. Real-time propagation and real-time collisions are observed on lattices in two spatial dimensions. The extension to three spatial dimensions is also developed, and a first look at 3-dimensional real-time dynamics is presented.

    ↳ hep-latnucl-thquant-ph35 citations

Affiliations

first authorsco-authorsvia INSPIRE