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Full-Text Articles in Physical Sciences and Mathematics
Dark Matter-Neutrino Interconversion At Coherent, Direct Detection, And The Early Universe, Nicholas Hurtado, Hana Mir, Ian M. Shoemaker, Eli Welch, Jason Wyenberg
Dark Matter-Neutrino Interconversion At Coherent, Direct Detection, And The Early Universe, Nicholas Hurtado, Hana Mir, Ian M. Shoemaker, Eli Welch, Jason Wyenberg
Faculty Work Comprehensive List
We study a dark matter (DM) model in which the dominant coupling to the standard model occurs through a neutrino-DM-scalar coupling. The new singlet scalar will generically have couplings to nuclei/electrons arising from renormalizable Higgs portal interactions. As a result, the DM particle X can convert into a neutrino via scattering on a target nucleus N: X+N→ν+N, leading to striking signatures at direct detection experiments. Similarly, DM can be produced in neutrino scattering events at neutrino experiments: ν+N→X+N, predicting spectral distortions at experiments such as COHERENT. Furthermore, the model allows for late kinetic decoupling of dark matter with implications for …
Origin Of Sterile Neutrino Dark Matter Via Secret Neutrino Interactions With Vector Bosons, Kevin J. Kelly, Manibrata Sen, Walter Tangarife, Yue Zhang
Origin Of Sterile Neutrino Dark Matter Via Secret Neutrino Interactions With Vector Bosons, Kevin J. Kelly, Manibrata Sen, Walter Tangarife, Yue Zhang
Physics: Faculty Publications and Other Works
Secret neutrino interactions can play an essential role in the origin of dark matter. We present an anatomy of production mechanisms for sterile neutrino dark matter, a keV-scale gauge-singlet fermion that mixes with active neutrinos, in the presence of a new vector boson mediating secret interactions among active neutrinos. We identify three regimes of the vector boson’s mass and coupling where it makes a distinct impact on dark matter production through the dispersion relations and/or scattering rates. We also analyze models with gauged Lμ−Lτ and B−L numbers which have a similar dark matter cosmology but different vector boson phenomenology. We …
Polarization Of Majorana Fermions In A Background Current, Lukas Karoly, David C. Latimer
Polarization Of Majorana Fermions In A Background Current, Lukas Karoly, David C. Latimer
Summer Research
A Majorana fermion is a particle which is its own antiparticle. As a consequence, their electromagnetic interactions are minimal. Because of this, they are a good candidate for dark matter with their sole static electromagnetic property being their anapole moment. The annihilation rate of Majorana fermions depends on whether their anapole moments are aligned (polarized) or anti-aligned (unpolarized). It is therefore important to understand how Majorana fermions polarize to better understand their annihilation rates. This can help us further understand and detect dark matter. Using Feynman diagrams, we calculate the cross section for the interaction between a Majorana fermion and …