Speaker
Sudhakantha Girmohanta
(Tsung-Dao Lee Institute and Shanghai Jiao Tong University)
Description
We will explore the possibility that the nano-Hz stochastic gravitational wave background recently reported by several Pulsar Timing Arrays is due to a first-order phase transition of a nearly conformal dark sector, using the dual radion effective potential formalism. The dark radiation from the secluded dark sector can alleviate the Hubble tension without violating the $\Delta N_{\rm eff}$ bound, and will be probed by future CMB-S4 experiment. We will also comment on the scenario where the dark sector decays into the visible sector.
Primary authors
KOHEI FUJIKURA
(U. Tokyo)
Dr
Motoo Suzuki
(Department of Physics, Harvard University)
Sudhakantha Girmohanta
(Tsung-Dao Lee Institute and Shanghai Jiao Tong University)
Yuichiro Nakai
