Speaker
Dr
Ippei Obata
(Max-Planck-Institute for Astrophysics)
Description
Antisymmetric tensor field (two-form field) is a ubiquitous component in string theory and generally couples to the scalar sector through its kinetic term. In this paper, we propose a cosmological scenario that the particle production of two-form field, which is triggered by the background motion of the coupled inflaton field, occurs at the intermediate stage of inflation and generates the sizable amount of primordial black holes as dark matter after inflation. We also compute the secondary gravitational waves sourced by the curvature perturbation and show that the resultant power spectra are testable with the future space- based laser interferometers.
Author
Dr
Ippei Obata
(Max-Planck-Institute for Astrophysics)
Co-authors
Prof.
Tomohiro Fujita
(Waseda Institute for Advanced Study, Waseda University)
Dr
Hiromasa Nakatsuka
(Institute for Cosmic Ray Research, The University of Tokyo)
Sam Young
(Instituut-Lorentz for Theoretical Physics, Leiden University)
