7 papers
Impact of dimension-8 SMEFT operators on baryogenesis via sphaleron decoupling
Kiyoto Ogawa, Masanori Tanaka
We investigate whether a baryogenesis mechanism known as sphalerogenesis can account for the observed baryon asymmetry of the Universe within the Standard Model effective field the…
Baryogenesis in multiplet models
Kiyoto Ogawa, Masanori Tanaka
We investigate baryogenesis in Standard Model (SM) extensions with new multiplet fields. We focus on sphalerogenesis, in which the baryon asymmetry of the Universe (BAU)…
Supermassive Primordial Black Holes from a Catalyzed Dark Phase Transition for Little Red Dots
Jinhui Guo, Jia Liu, Masanori Tanaka +2
JWST has revealed an abundant population of compact, low-metallicity "Little Red Dots" (LRDs) at high redshift, challenging conventional scenarios in which supermassive black holes…
Super-critical primordial black hole formation via delayed first-order electroweak phase transition
Katsuya Hashino, Shinya Kanemura, Tomo Takahashi +2
The delay of the first-order electroweak phase transitions (EWPT) may lead to the emergence of baby universes inside wormhole structures due to the large vacuum energy density in f…
New collider implications on a strongly first order EWPT
Ricardo R. Florentino, Shinya Kanemura, Masanori Tanaka
In order to understand the early history of the universe, and to test baryogenesis models, determining the nature of the electroweak phase transition is imperative. The order and s…
Exploring loop-induced first-order electroweak phase transition in the Higgs effective field theory
Ricardo R. Florentino, Shinya Kanemura, Masanori Tanaka
The nearly aligned Higgs Effective Field Theory (naHEFT) is based on the general assumption: all deviations in the Higgs boson couplings are originated from quantum one-loop effect…