Smooth hybrid inflation in supergravity with a running spectral index and early star formation

2004/02/29 by Masahide Yamaguchi, Jun’ichi Yokoyama, Jun'ichi Yokoyama · 44 citations
Physics and Astronomy · #Astronomy #Astrophysics #Black Holes and Theoretical Physics #Computer science #Cosmology and Gravitation Theories #Galaxies: Formation, Evolution, Phenomena #Index (typography) #Inflation (cosmology) #Mathematical physics #Physics #Spectral index #Spectral line #Star (game theory) #Supergravity #astro-ph #hep-ph

paper · pdf · doi:10.1103/physrevd.70.023513

published in Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fields 70(2) (American Physical Society) · 12 pages, 1 figure, to appear in Phys. Rev. D

arxiv created 2004/07/14 · openalex publication_date 2004/07/30 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

It is shown that in a smooth hybrid inflation model in supergravity adiabatic fluctuations with a running spectral index with n_s>1 on a large scale and n_s<1 on a smaller scale can be naturally generated, as favored by the first-year data of WMAP. It is due to the balance between the nonrenormalizable term in the superpotential and the supergravity effect. However, since smooth hybrid inflation does not last long enough to reproduce the central value of observation, we invoke new inflation after the first inflation. Its initial condition is set dynamically during smooth hybrid inflation and the spectrum of fluctuations generated in this regime can have an appropriate shape to realize early star formation as found by WMAP. Hence two new features of WMAP observations are theoretically explained in a unified manner.

Citations

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