10 papers
Neutron Portal and Dark Matter-Baryon Coincidence: from UV Completion to Phenomenology
Sudhakantha Girmohanta, Yuichiro Nakai, Yoshihiro Shigekami +1
We present a dynamical solution to the dark matter-baryon coincidence problem based on the neutron portal operator connecting the visible and dark sector asymmetries. This framewor…
Implications of DESI for Dark Matter & Cosmic Birefringence
Basabendu Barman, Sudhakantha Girmohanta
We explore an interacting dark matter (DM)-dark energy (DE) framework that naturally yields an effective dynamical DE equation of state crossing the phantom barrier at early times,…
Quest for a phenomenologically consistent low cutoff theory
Sudhakantha Girmohanta, Yu-Cheng Qiu
The Randall-Sundrum model with the Higgs localized on the IR brane solves the gauge hierarchy problem. However, the associated low cutoff ( TeV) generically leads to una…
Postsphaleron darkogenesis
Sudhakantha Girmohanta, Yuichiro Nakai, Zhihao Zhang
A supercooled phase transition in a nearly conformal dark sector can provide a natural setting for darkogenesis via its out-of-equilibrium dynamics, where a particle-antiparticle n…
Interplay of ALP Couplings at a Muon Collider
So Chigusa, Sudhakantha Girmohanta, Yuichiro Nakai +1
Axion-like particles can couple to Standard Model gluons, electroweak gauge bosons, and massive fermions. A future multi-TeV muon collider provides a favorable environment to probe…
Wiggly dilaton: a landscape of spontaneously broken scale invariance
Sudhakantha Girmohanta, Yuichiro Nakai, Yu-Cheng Qiu +1
The dilaton emerges as a pseudo-Nambu-Goldstone boson (pNGB) associated with the spontaneous breaking of scale invariance in a nearly conformal field theory (CFT). We show the exis…