491 citations · 6.8k across the 96 of their papers we have counts for
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NANOGrav spectral index from melting domain walls
E. Babichev, D. Gorbunov, S. Ramazanov +2
We discuss cosmic domain walls described by a tension red-shifting with the expansion of the Universe. These melting domain walls emit gravitational waves with the low-frequency sp…
Gravitational shine of dark domain walls
E. Babichev, D. Gorbunov, S. Ramazanov +1
Cosmic domain walls are harmless, provided that their tension decreases with expansion of the Universe. This setup can be realized, if the scale of spontaneous symmetry breaking is…
Beyond freeze-in: Dark Matter via inverse phase transition and gravitational wave signal
S. Ramazanov, E. Babichev, D. Gorbunov +1
We propose a novel scenario of Dark Matter production naturally connected with generation of gravitational waves. Dark Matter is modelled as a real scalar, which interacts with the…
Gravitational reheating and superheavy Dark Matter creation after inflation with non-minimal coupling
E. Babichev, D. Gorbunov, S. Ramazanov +1
We discuss the gravitational creation of superheavy particles in an inflationary scenario with a quartic potential and a non-minimal coupling between the inflaton and the R…
Gravitational misalignment mechanism of Dark Matter production
Eugeny Babichev, Dmitry Gorbunov, Sabir Ramazanov
We consider Dark Matter composed of an oscillating singlet scalar field. On top of the mass term, the scalar is equipped with a potential spontaneously breaking Z_2-symmetry. This…
New mechanism of producing superheavy Dark Matter
Eugeny Babichev, Dmitry Gorbunov, Sabir Ramazanov
We study in detail the recently proposed mechanism of generating superheavy Dark Matter with the mass larger than the Hubble rate at the end of inflation. A real scalar field const…