@article{stapleford_vaananen_kneller_mclaughlin_shapiro_2016, title={Nonstandard neutrino interactions in supernovae}, volume={94}, ISSN={["2470-0029"]}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-85002112694&partnerID=MN8TOARS}, DOI={10.1103/physrevd.94.093007}, abstractNote={Nonstandard interactions (NSI) of neutrinos with matter can significantly alter neutrino flavor evolution in supernovae with the potential to impact explosion dynamics, nucleosynthesis, and the neutrinos signal. In this paper, we explore, both numerically and analytically, the landscape of neutrino flavor transformation effects in supernovae due to NSI and find a new, heretofore unseen transformation processes can occur. These new transformations can take place with NSI strengths well below current experimental limits. Within a broad swath of NSI parameter space, we observe symmetric and standard matter-neutrino resonances for supernovae neutrinos, a transformation effect previously only seen in compact object merger scenarios; in another region of the parameter space we find the NSI can induce neutrino collective effects in scenarios where none would appear with only the standard case of neutrino oscillation physics; and in a third region the NSI can lead to the disappearance of the high density Mikheyev-Smirnov-Wolfenstein resonance. Using a variety of analytical tools, we are able to describe quantitatively the numerical results allowing us to partition the NSI parameter according to the transformation processes observed. Our results indicate nonstandard interactions of supernova neutrinos provide a sensitive probe of beyond the Standard Model physics complementary to present and future terrestrial experiments.}, number={9}, journal={PHYSICAL REVIEW D}, author={Stapleford, Charles J. and Vaananen, Daavid J. and Kneller, James P. and McLaughlin, Gail C. and Shapiro, Brandon T.}, year={2016}, month={Nov} }
 @article{vaananen_mclaughlin_2016, title={Uncovering the matter-neutrino resonance}, volume={93}, ISSN={["2470-0029"]}, DOI={10.1103/physrevd.93.105044}, abstractNote={Matter-neutrino resonances (MNRs) can drastically modify neutrino flavor evolution in astrophysical environments and may significantly impact nucleosynthesis. Here we further investigate the underlying physics of MNR-type flavor transitions. We provide generalized resonance conditions and make analytical predictions for the behavior of the system. We discuss the adiabatic evolution of these transitions considering both symmetric and standard MNR scenarios. Symmetric MNR transitions differ from standard MNR transitions in that both neutrinos and antineutrinos can completely transform to other flavors simultaneously. We provide an example of the simplest system in which such transitions can occur with a neutrino and an antineutrino having a single energy and emission angle. We further apply linearized stability analysis to predict the location of self-induced nutation-type (or bipolar) oscillations due to $\ensuremath{\nu}\ensuremath{\nu}$ interactions in the regions where MNR is ineffective. In all cases, we compare our analytical predictions to numerical calculations.}, number={10}, journal={PHYSICAL REVIEW D}, author={Vaananen, D. and McLaughlin, G. C.}, year={2016}, month={May} }