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4 papers · 1 filter
Generating Primordial Black Holes Via Hilltop-Type Inflation Models
Laila Alabidi, Kazunori Kohri
It has been shown that black holes would have formed in the early Universe if, on any given scale, the spectral amplitude of the Cosmic Microwave Background (CMB) exceeds 10^(-4).…
Diffuse gamma-ray background and cosmic-ray positrons from annihilating dark matter
Masahiro Kawasaki, Kazunori Kohri, Kazunori Nakayama
We study the annihilating dark matter contribution to the extra-galactic diffuse gamma-ray background spectrum, motivated by the recent observations of cosmic-ray positron/electron…
Gravitational waves from the fragmentation of a supersymmetric condensate
Alexander Kusenko, Anupam Mazumdar, Tuomas Multamaki
We discuss the production of gravity waves from the fragmentation of a supersymmetric condensate in the early universe. Supersymmetry predicts the existence of flat directions in t…
Newton's constant in f(R,R_{μν}R^{μν},\Box R) theories of gravity and constraints from BBN
Savvas Nesseris, Anupam Mazumdar
We consider corrections to the Einstein-Hilbert action which contain both higher order and nonlocal terms. We derive an effective Newtonian gravitational constant applicable at the…