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

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 [1] ; ORCiD logo [1] ; ORCiD logo [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Report Number(s):
LA-UR-17-24744
Journal ID: ISSN 0370-2693
Grant/Contract Number:
AC52-06NA25396
Type:
Published Article
Journal Name:
Physics Letters. Section B
Additional Journal Information:
Journal Volume: 774; Journal ID: ISSN 0370-2693
Publisher:
Elsevier
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; neutrino oscillations, dense neutrino medium
OSTI Identifier:
1437726
Alternate Identifier(s):
OSTI ID: 1398925

Cirigliano, Vincenzo, Paris, Mark W., and Shalgar, Shashank. Effect of collisions on neutrino flavor inhomogeneity in a dense neutrino gas. United States: N. p., 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. United States. doi:10.1016/j.physletb.2017.09.039.
Cirigliano, Vincenzo, Paris, Mark W., and Shalgar, Shashank. 2017. "Effect of collisions on neutrino flavor inhomogeneity in a dense neutrino gas". United States. doi: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. Section B},
number = ,
volume = 774,
place = {United States},
year = {2017},
month = {9}
}