242 citations · 2.1k across the 39 of their papers we have counts for
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Primordial Black Holes and Induced Gravitational Waves from a Smooth Crossover beyond Standard Model
Albert Escrivà, Yuichiro Tada, Chul-Moon Yoo
Gravitational waves (GWs) induced by primordial fluctuations can be affected by the modification of the sound speed and the equation of state parameter once the c…
Translating nano-Hertz gravitational wave background into primordial perturbations taking account of the cosmological QCD phase transition
Katsuya T. Abe, Yuichiro Tada
The evidence of the nano-Hertz stochastic gravitational wave (GW) background is reported by multiple pulsar timing array collaborations. While a prominent candidate of the origin i…
Stochastic dynamics of multi-waterfall hybrid inflation and formation of primordial black holes
Yuichiro Tada, Masaki Yamada
We show that a hybrid inflation model with multiple waterfall fields can result in the formation of primordial black hole (PBH) with an astrophysical size, by using an advanced alg…
On the primordial black hole formation in hybrid inflation
Yuichiro Tada, Masaki Yamada
We revisit the scenario of primordial black hole (PBH) formation from large curvature perturbations generated during the waterfall phase transition in hybrid inflation models. In a…
Primordial Black Holes
Albert Escrivà, Florian Kuhnel, Yuichiro Tada
Aspects of primordial black holes, i.e. black holes formed in the early Universe, are reviewed. Special emphasis is put on their formation, their role as dark matter candidates and…
Primordial black holes and gravitational waves induced by exponential-tailed perturbations
Katsuya T. Abe, Ryoto Inui, Yuichiro Tada +1
Primordial black holes (PBHs) whose masses are in have been extensively studied as a candidate of whole dark matter (DM). One of the probe…