Speaker
Dr
Chitta Ranjan Das
(Bogoliubov Laboratory of Theoretical Physics (BLTP), Joint Institute for Nuclear Research (JINR), Dubna, Russian Federation)
Description
Five fundamental problems - neutrino oscillations, baryogenesis, dark matter, inflation, strong CP problem - are solved at one stroke in a model, dubbed as "SM-A-S-H" (Standard Model-Axion-Seesaw-Higgs portal inflation) by Andreas Ringwald et. al. The Standard Model (SM) particle content is extended by three right-handed SM-singlet neutrinos $N_i$, a vector-like color triplet quark $Q$, a complex SM-singlet scalar field $\sigma$ that stabilises the Higgs potential, all of them being charged under a global lepton number (hyper-charge) and Peccei-Quinn (PQ) U(1) symmetry, the vacuum expectation value $v_\sigma \sim 10^{11}$ GeV breaks the lepton number and the Peccei-Quinn symmetry simultaneously. We found that numerically SMASH model not only solves five fundamental problems but also the sixth problem "Vacuum Metastability" through the extended scalar sector.
Summary
SMASH unifies axions, seesaw and extended Higgs sector on one energy scale, $\mu\sim 10^{10}$ - $10^{11}$ GeV, solving several problems badgering the Standard Model in one go. SM vacuum is metastable, since $\lambda_H$ turns negative around $\mu\simeq 10^{12}$ GeV, SMASH can fix this vacuum metastability problem with $\lambda_{H\sigma} \approx$ between $-10^{-6}$ & $-0.1$.
Primary author
Dr
Chitta Ranjan Das
(Bogoliubov Laboratory of Theoretical Physics (BLTP), Joint Institute for Nuclear Research (JINR), Dubna, Russian Federation)
Co-authors
Prof.
Katri Huitu
(Helsinki Institute of Physics & Department of Physics, University of Helsinki, Finland)
Mr
Timo J. Kärkkäinen
(Helsinki Institute of Physics & Department of Physics, University of Helsinki, Finland)
