2003/04/30 by Kenji Kadota, Ewan D. Stewart, Ewan D Stewart · 6 citations
Physics and Astronomy · #Back-reaction #Black Holes and Theoretical Physics #Cosmology #Cosmology and Gravitation Theories #Coupling (piping) #Dilaton #Inflation (cosmology) #Modular design #Noncommutative and Quantum Gravity Theories #Scale (ratio) #Slow roll #astro-ph #hep-ph #hep-th
paper · pdf · doi:10.1088/1126-6708/2003/07/013
published as JHEP 0307 (2003) 013 · 18 pages, 2 eps figures; appendices and footnotes added
openalex publication_date 2003/07/05 · arxiv created 2003/07/15 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We present a modular cosmology scenario where the difficulties encountered in conventional modular cosmology are solved in a self-consistent manner, with definite predictions to be tested by observation. Notably, the difficulty of the dilaton finding its way to a precarious weak coupling minimum is made irrelevant by having eternal modular inflation at the vacuum supersymmetry breaking scale after the dilaton is stabilised. Neither this eternal inflation nor the subsequent non-slow-roll modular inflation destabilise the dilaton from its precarious minimum due to the low energy scale of the inflation and consequent small back reaction on the dilaton potential. The observed flat CMB spectrum is obtained from fluctuations in the angular component of a modulus near a symmetric point, which are hugely magnified by the roll down of the modulus to Planckian values, allowing them to dominate the final curvature perturbation. We also give precise calculations of the spectral index and its running.