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A Time-Varying Fine Structure Constant from Naturally Ultralight Dark Matter
Dawid Brzeminski, Zackaria Chacko, Abhish Dev +1
We present a class of models in which the coupling of the photon to an ultralight scalar field that has a time-dependent vacuum expectation value causes the fine structure constant…
Neutrino Masses from Low Scale Partial Compositeness
Zackaria Chacko, Patrick J. Fox, Roni Harnik +1
We consider a class of models in which the neutrinos acquire Majorana masses through mixing with singlet neutrinos that emerge as composite states of a strongly coupled hidden sect…
Predictive Dirac and Majorana Neutrino Mass Textures from Grand Unified Theories
Zackaria Chacko, P. S. Bhupal Dev, Rabindra N. Mohapatra +1
We present simple and predictive realizations of neutrino masses in theories based on the grand unifying group. At the level of the lowest-dimension operators, this class o…
Determining the Neutrino Lifetime from Cosmology
Zackaria Chacko, Abhish Dev, Peizhi Du +2
We explore the cosmological signals of theories in which the neutrinos decay into invisible dark radiation after becoming non-relativistic. We show that in this scenario, near-futu…