Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1998-07-30
Phys.Rev.D59:043512,1999
Physics
High Energy Physics
High Energy Physics - Phenomenology
15pages (RevTeX file), final version to be published in Phys. Rev. D
Scientific paper
10.1103/PhysRevD.59.043512
We study a double inflation model (a preinflation + a new inflation) in supergravity and discuss the formation of primordial black holes which may be identified with massive compact halo objects (MACHOs) observed in the halo of our galaxy. The preinflation drives an inflaton for the new inflation close to the origin through supergravity effects and the new inflation naturally occurs. If the total e-fold number of the new inflation is smaller than $\sim 60$, both inflations produce cosmologically relevant density fluctuations. If the coherent inflaton oscillation after the preinflation continues until the beginning of the new inflation, density fluctuations on small cosmological scales can be set suitably large to produce black holes MACHOs of masses $\sim 1 M_{\odot}$ in a wide region of parameter space in the double inflation model.
Kawasaki Masahiro
Yanagida Takayuki
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