The thesis presents a new 3-to-2 freezeout mechanism, bound-state effects on searches, a new axion interferometric search, reionization assessments, 21-cm constraints, and the DarkHistory code for ionization and thermal histories.
Cosmology and Astrophysics of Minimal Dark Matter
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abstract
We consider DM that only couples to SM gauge bosons and fills one gauge multiplet, e.g. a fermion 5-plet (which is automatically stable), or a wino-like 3-plet. We revisit the computation of the cosmological relic abundance including non-perturbative corrections. The predicted mass of e.g. the 5-plet increases from 4.4 TeV to 10 TeV, and indirect detection rates are enhanced by 2 orders of magnitude. Next, we show that due to the quasi-degeneracy among neutral and charged components of the DM multiplet, a significant fraction of DM with energy E > 10^17 eV (possibly present among ultra-high energy cosmic rays) can cross the Earth exiting in the charged state and may in principle be detected in neutrino telescopes.
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Computes one-loop anomalous dimensions for EDM-generating operators in triplet and 5-plet Majorana fermion models, reporting O(10)% enhancement for triplet and factor greater than 2 for 5-plet.
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Dark Matter Energy Deposition and Production from the Table-Top to the Cosmos
The thesis presents a new 3-to-2 freezeout mechanism, bound-state effects on searches, a new axion interferometric search, reionization assessments, 21-cm constraints, and the DarkHistory code for ionization and thermal histories.
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Renormalization Effects on Electric Dipole Moments in Electroweakly Interacting Massive Particle Models
Computes one-loop anomalous dimensions for EDM-generating operators in triplet and 5-plet Majorana fermion models, reporting O(10)% enhancement for triplet and factor greater than 2 for 5-plet.