109 citations · 770 across the 24 of their papers we have counts for
4 papers · 1 filter
Enhancing Searches for Heavy QCD Axions via Dimuon Final States
Raymond T. Co, Soubhik Kumar, Zhen Liu
Heavy QCD axions are well-motivated extensions of the QCD axion that address the quality problem while still solving the strong CP problem. Owing to the gluon coupling, critical fo…
Multifield Positivity Bounds for Inflation
Marat Freytsis, Soubhik Kumar, Grant N. Remmen +1
Positivity bounds represent nontrivial limitations on effective field theories (EFTs) if those EFTs are to be completed into a Lorentz-invariant, causal, local, and unitary framewo…
Dark Grand Unification in the Axiverse: Decaying Axion Dark Matter and Spontaneous Baryogenesis
Joshua W. Foster, Soubhik Kumar, Benjamin R. Safdi +1
The quantum chromodynamics axion with a decay constant near the Grand Unification (GUT) scale has an ultralight mass near a neV. We show, however, that axion-like particles with ma…
Classical Cosmological Collider Physics and Primordial Features
Xingang Chen, Reza Ebadi, Soubhik Kumar
Features in the inflationary landscape can inject extra energies to inflation models and produce on-shell particles with masses much larger than the Hubble scale of inflation. This…