165 citations · 2.5k across the 85 of their papers we have counts for
8 papers · 1 filter
Hessian eigenvalue distribution in a random Gaussian landscape
Masaki Yamada, Alexander Vilenkin
The energy landscape of multiverse cosmology is often modeled by a multi-dimensional random Gaussian potential. The physical predictions of such models crucially depend on the eige…
Inflation in Random Landscapes with two energy scales
Jose J. Blanco-Pillado, Alexander Vilenkin, Masaki Yamada
We investigate inflation in a multi-dimensional landscape with a hierarchy of energy scales, motivated by the string theory, where the energy scale of Kahler moduli is usually assu…
Entanglement Entropy and Decoupling in the Universe
Yuichiro Nakai, Noburo Shiba, Masaki Yamada
In the expanding universe, two interacting fields are no longer in thermal contact when the interaction rate becomes smaller than the Hubble expansion rate. After decoupling, two s…
Adiabatic suppression of the axion abundance and isocurvature due to coupling to hidden monopoles
Masahiro Kawasaki, Fuminobu Takahashi, Masaki Yamada
The string theory predicts many light fields called moduli and axions, which cause a cosmological problem due to the overproduction of their coherent oscillation after inflation. O…
Inflation in multi-field random Gaussian landscapes
Ali Masoumi, Alexander Vilenkin, Masaki Yamada
We investigate slow-roll inflation in a multi-field random Gaussian landscape. The landscape is assumed to be small-field, with a correlation length much smaller than the Planck sc…
False Vacuum Decay Catalyzed by Black Holes
Kyohei Mukaida, Masaki Yamada
False vacuum states are metastable in quantum field theories, and true vacuum bubbles can be nucleated due to the quantum tunneling effect. It was recently suggested that an evapor…
Initial conditions for slow-roll inflation in a random Gaussian landscape
Ali Masoumi, Alexander Vilenkin, Masaki Yamada
In the landscape perspective, our Universe begins with a quantum tunneling from an eternally-inflating parent vacuum, followed by a period of slow-roll inflation. We investigate th…
Inflation in random Gaussian landscapes
Ali Masoumi, Alexander Vilenkin, Masaki Yamada
We develop analytic and numerical techniques for studying the statistics of slow-roll inflation in random Gaussian landscapes. As an illustration of these techniques, we analyze sm…