6 papers
Constraining the inflaton potential with gravitational waves from oscillons
Kaloian D. Lozanov, Misao Sasaki, Jan Tränkle
Under certain conditions, the oscillating inflaton condensate filling the Universe after inflation can fragment and form so-called oscillons. These long-lived soliton-like field co…
Dark matter from inflationary quantum fluctuations
Mohammad Ali Gorji, Misao Sasaki, Teruaki Suyama
We explore a scenario in which dark matter is a massive bosonic field, arising solely from quantum fluctuations generated during inflation. In this framework, dark matter exhibits…
Halo Formation from Yukawa Forces in the Very Early Universe
Guillem Domènech, Derek Inman, Alexander Kusenko +1
If long-range attractive forces exist and are stronger than gravity then cosmic halo formation can begin in the radiation-dominated era. We study a simple realization of this effec…
Axion-like Universal Gravitational Wave Interpretation of Pulsar Timing Array Data
Kaloian D. Lozanov, Shi Pi, Misao Sasaki +2
Formation of cosmological solitons is generically accompanied by production of gravitational waves (GWs), with a universal GW background expected at frequency scales below that of…
Universal Gravitational Wave Signatures of Cosmological Solitons
Kaloian D. Lozanov, Misao Sasaki, Volodymyr Takhistov
Cosmological solitonic objects such as monopoles, cosmic strings, domain walls, oscillons and Q-balls often appear in theories of the early Universe. We demonstrate that such scena…
Crunch from AdS bubble collapse in unbounded potentials
Kaloian D. Lozanov, Misao Sasaki
We consider a scalar field theory with a Minkowski false vacuum and an unbounded (or very deep) true vacuum. We show compelling evidence that an AdS bubble of vanishing total energ…