A second project approached the Higgs hierarchy problem through cosmology. The model proposes that different regions of an eternally inflating universe can have different electroweak scales. Regions with the highest vacuum energy expand faster and dominate in volume, selecting a non-zero Higgs scale much smaller than the cutoff.
At the other end of the scale, Susobhan studied massless neutrinos interacting with ultralight dark matter. With two additional light sterile neutrinos, these interactions can give neutrinos effective “refractive” masses. A dark-matter halo inside the Sun could alter solar-neutrino survival probabilities, producing a distinctive flat region between about 2 and 15 MeV in the dark-LMA region. DUNE, Hyper-K and JUNO can test these features.
His interest in particle physics began with the 2012 Higgs discovery. After studying electrical engineering, he switched to physics to work on Higgs physics. He will continue in effective field theory as a postdoctoral researcher at the University of Utah.
Congratulations, Susobhan, on completing your PhD at TIFR.