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.
Search for Cosmic Axions using an Optical Interferometer
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abstract
A high finesse optical cavity can be used to search for cosmic axions in the mass range 10^{-6}< m_a <10^{-4} eV. Either a two-arm or a single-arm cavity is suitable and in either case the signal as resonant sidebands imposed on the carrier. Assuming for the local axion density the usual figure of 500 MeV/cm^3 [8], the KSVZ axion line [4] g/m_a = 0.4 Gev^{-2}, can be reached over the full mass range in a one year search.
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Reactor-adjacent CsI(Tl) detector achieves low MeV background enabling projected sensitivity to g_aγγ ≳ 10^{-6} and 10^{-8} < g_aee < 10^{-4} for 1 keV–10 MeV ALPs.
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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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Reactor-based Search for Axion-Like Particles using CsI(Tl) Detector
Reactor-adjacent CsI(Tl) detector achieves low MeV background enabling projected sensitivity to g_aγγ ≳ 10^{-6} and 10^{-8} < g_aee < 10^{-4} for 1 keV–10 MeV ALPs.