Self-tuning inflation
نویسندگان
چکیده
Abstract We develop an inflationary model without small parameters on the basis of multidimensional f ( R ) gravity with a minimally coupled scalar field. The is described by two stages space expansion. first one begins at energy scales about D-dimensional Planck mass and ends de Sitter metric our maximally symmetric extra dimensions. In following, quantum fluctuations produce wide set inhomogeneous metrics in causally disconnected regions quickly generated space. find specific that leads to effective Starobinsky fits observational data.
منابع مشابه
Self-tuning of Cosmological Constant and Exit from Inflation *
I review the recent 5D self-tuning solutions of the cosmological constant problem, and try to unify two cosmological constant problems within the framework of the self-tuning solutions. One problem, the large cosmological constant needed for inflation, is interpreted by starting with the parameters allowing only the dS vacuum, and the vanishing cosmological constant at a true vacuum is realized...
متن کاملBrane Inflation and Fine Tuning
We argue about the importance of embedding the successful mechanism of Inflation in the context of a fundamental theory. We review some of the attempts in this direction made in the framework of String Theory. In particular we report on recent developments in Brane Inflation with emphasis on the fine tuning issue.
متن کاملFine-Tuning in Brane-antibrane Inflation
I give a brief overview of brane-antibrane inflation, with emphasis on the problems of tuning to get a flat potential in the KKLMMT framework, and recent work on the nature of superpotential corrections in that model.
متن کاملPre-Big-Bang Inflation Requires Fine Tuning
The pre-big-bang cosmology inspired by superstring theories has been suggested as an alternative to slow-roll inflation. We analyze, in both the Jordan and Einstein frames, the effect of spatial curvature on this scenario and show that too much curvature — of either sign — reduces the duration of the inflationary era to such an extent that the flatness and horizon problems are not solved. Hence...
متن کاملDesign of A Self-Tuning Adaptive Power System Stabilizer
Power system stabilizers (PSSs) must be capable of providing appropriate stabilization signals over abroad range of operating conditions and disturbances. The main idea of this paper is changing aclassic PSS (CPSS) to an adaptive PSS using genetic algorithm. This new genetic algorithm based onadaptive PSS (GAPSS) improves power system damping, considerably. The controller design issue isformula...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: European Physical Journal C
سال: 2022
ISSN: ['1434-6044', '1434-6052']
DOI: https://doi.org/10.1140/epjc/s10052-022-10983-w