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Title: Effect of collisions on neutrino flavor inhomogeneity in a dense neutrino gas

Abstract

We investigate the stability, with respect to spatial inhomogeneity, of a two-dimensional dense neutrino gas. The system exhibits growth of seed inhomogeneity due to nonlinear coherent neutrino self-interactions. In the absence of incoherent collisional effects, we also observe a dependence of this instability growth rate on the neutrino mass spectrum: the normal neutrino mass hierarchy exhibits spatial instability over a larger range of neutrino number density compared to that of the inverted case. Furthermore, we consider the effect of elastic incoherent collisions of the neutrinos with a static background of heavy, nucleon-like scatterers. At small scales, the growth of flavor instability can be suppressed by collisions. At large length scales we find, perhaps surprisingly, that for inverted neutrino mass hierarchy incoherent collisions fail to suppress flavor instabilities, independent of the coupling strength.

Authors:
; ; ORCiD logo
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1437726
Alternate Identifier(s):
OSTI ID: 1398925
Report Number(s):
LA-UR-17-24744
Journal ID: ISSN 0370-2693; S0370269317307505; PII: S0370269317307505
Grant/Contract Number:  
20170430ER; AC52-06NA25396
Resource Type:
Published Article
Journal Name:
Physics Letters B
Additional Journal Information:
Journal Name: Physics Letters B Journal Volume: 774 Journal Issue: C; Journal ID: ISSN 0370-2693
Publisher:
Elsevier
Country of Publication:
Netherlands
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; neutrino oscillations, dense neutrino medium

Citation Formats

Cirigliano, Vincenzo, Paris, Mark W., and Shalgar, Shashank. Effect of collisions on neutrino flavor inhomogeneity in a dense neutrino gas. Netherlands: N. p., 2017. Web. doi:10.1016/j.physletb.2017.09.039.
Cirigliano, Vincenzo, Paris, Mark W., & Shalgar, Shashank. Effect of collisions on neutrino flavor inhomogeneity in a dense neutrino gas. Netherlands. doi:https://doi.org/10.1016/j.physletb.2017.09.039
Cirigliano, Vincenzo, Paris, Mark W., and Shalgar, Shashank. Wed . "Effect of collisions on neutrino flavor inhomogeneity in a dense neutrino gas". Netherlands. doi:https://doi.org/10.1016/j.physletb.2017.09.039.
@article{osti_1437726,
title = {Effect of collisions on neutrino flavor inhomogeneity in a dense neutrino gas},
author = {Cirigliano, Vincenzo and Paris, Mark W. and Shalgar, Shashank},
abstractNote = {We investigate the stability, with respect to spatial inhomogeneity, of a two-dimensional dense neutrino gas. The system exhibits growth of seed inhomogeneity due to nonlinear coherent neutrino self-interactions. In the absence of incoherent collisional effects, we also observe a dependence of this instability growth rate on the neutrino mass spectrum: the normal neutrino mass hierarchy exhibits spatial instability over a larger range of neutrino number density compared to that of the inverted case. Furthermore, we consider the effect of elastic incoherent collisions of the neutrinos with a static background of heavy, nucleon-like scatterers. At small scales, the growth of flavor instability can be suppressed by collisions. At large length scales we find, perhaps surprisingly, that for inverted neutrino mass hierarchy incoherent collisions fail to suppress flavor instabilities, independent of the coupling strength.},
doi = {10.1016/j.physletb.2017.09.039},
journal = {Physics Letters B},
number = C,
volume = 774,
place = {Netherlands},
year = {2017},
month = {11}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: https://doi.org/10.1016/j.physletb.2017.09.039

Citation Metrics:
Cited by: 4 works
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Works referencing / citing this record:

Collective neutrino oscillations with the halo effect in single-angle approximation
journal, November 2018

  • Cirigliano, Vincenzo; Paris, Mark; Shalgar, Shashank
  • Journal of Cosmology and Astroparticle Physics, Vol. 2018, Issue 11
  • DOI: 10.1088/1475-7516/2018/11/019

Nonlinear flavor development of a two-dimensional neutrino gas
journal, July 2019


Neutrino quantum kinetics in compact objects
journal, June 2019

  • Richers, Sherwood A.; McLaughlin, Gail C.; Kneller, James P.
  • Physical Review D, Vol. 99, Issue 12
  • DOI: 10.1103/physrevd.99.123014

On the Occurrence of Crossings between the Angular Distributions of Electron Neutrinos and Antineutrinos in the Supernova Core
journal, September 2019