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7 papers · 2 filters
New cosmological constraints on primordial black holes
B. J. Carr, Kazunori Kohri, Yuuiti Sendouda +1
We update the constraints on the fraction of the Universe going into primordial black holes in the mass range 10^9--10^17 g associated with the effects of their evaporations on big…
Vector Curvaton without Instabilities
Konstantinos Dimopoulos, Mindaugas Karciauskas, Jacques M. Wagstaff
A vector curvaton model with a Maxwell kinetic term and varying kinetic function and mass during inflation is studied. It is shown that, if light until the end of inflation, the ve…
Non-gaussianity at tree and one-loop levels from vector field perturbations
Cesar A. Valenzuela-Toledo, Yeinzon Rodriguez, David H. Lyth
We study the spectrum P_ζand bispectrum B_ζof the primordial curvature perturbation ζwhen the latter is generated by scalar and vector field perturbations. The tree-level and one-l…
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…