A Caltech Library Service

Effect of topological defects on "nuclear pasta" observables

Schneider, A. S. and Berry, D. K. and Caplan, M. E. and Horowitz, C. J. and Lin, Z. (2016) Effect of topological defects on "nuclear pasta" observables. Physical Review C, 93 (6). Art. No. 065806. ISSN 0556-2813. doi:10.1103/PhysRevC.93.065806.

[img] PDF - Published Version
See Usage Policy.

[img] PDF - Submitted Version
See Usage Policy.


Use this Persistent URL to link to this item:


Background: The “pasta” phase of nuclear matter may play an important role in the structure and evolution of neutron stars. Recent works suggest nuclear pasta has a high resistivity which could be explained by the presence of long-lived topological defects. The defects act as impurities that decrease thermal and electrical conductivity of the pasta. Purpose: To quantify how topological defects affect transport properties of nuclear pasta and estimate this effect using an impurity parameter Q_(imp). Methods: Contrast molecular dynamics simulations of up to 409 600 nucleons arranged in parallel nuclear pasta slabs (perfect pasta) with simulations of pasta slabs connected by topological defects (impure pasta). From these simulations we compare the viscosity and heat conductivity of perfect and impure pasta to obtain an effective impurity parameter Q_(imp) due to the presence of defects. Results: Both the viscosity and thermal conductivity calculated for both perfect and impure pasta are anisotropic, peaking along directions perpendicular to the slabs and reaching a minimum close to zero parallel to them. In our 409 600 nucleon simulation topological defects connecting slabs of pasta reduce both the thermal conductivity and viscosity on average by about 37%. We estimate an effective impurity parameter due to the defects of order Q_(imp)∼30. Conclusions: Topological defects in the pasta phase of nuclear matter have an effect similar to impurities in a crystal lattice. The irregularities introduced by the defects reduce the thermal and electrical conductivities and the viscosity of the system. This effect can be parametrized by a large impurity parameter Q_(imp)∼30.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Schneider, A. S.0000-0003-0849-7691
Additional Information:© 2016 American Physical Society. Received 14 February 2016; published 17 June 2016. A.S.S. is supported in part by the Conselho Nacional de Desenvolvimento Científico e Tecnológico (201432/2014-5) and in part by the National Science Foundation under Award No. AST-1333520 and CAREER PHY-1151197. This research was supported in part by DOE Grants No. DE-FG02-87ER40365 (Indiana University) and No. DE-SC0008808 (NUCLEI SciDAC Collaboration). This research was also supported in part by Lilly Endowment, Inc., through its support for the Indiana University Pervasive Technology Institute, and in part by the Indiana METACyt Initiative. The Indiana METACyt Initiative at IU is also supported in part by Lilly Endowment, Inc.
Group:TAPIR, Walter Burke Institute for Theoretical Physics
Funding AgencyGrant Number
Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)201432/2014-5
Department of Energy (DOE)DE-FG02-87ER40365
Department of Energy (DOE)DE-SC0008808
Lilly Endowment, Inc.UNSPECIFIED
Issue or Number:6
Classification Code:PACS numbers: 26.60.-c, 02.70.Ns, 61.30.Jf, 44.10.+i, 66.20.Cy
Record Number:CaltechAUTHORS:20160602-070550209
Persistent URL:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:67561
Deposited By: Ruth Sustaita
Deposited On:02 Jun 2016 19:53
Last Modified:11 Nov 2021 03:50

Repository Staff Only: item control page