2006/10/18 by S. Kalyana Rama · 2 citations
Physics and Astronomy · #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #Entropy (arrow of time) #Friedmann–Lemaître–Robertson–Walker metric #Galaxies: Formation, Evolution, Phenomena #Mathematical physics #Physics #Quantum mechanics #Spacetime #Theoretical physics #Universe #cond-mat.stat-mech #gr-qc #hep-th
paper · pdf · doi:10.1016/j.physletb.2006.11.077
published as Phys.Lett.B645:365-368,2007 · 11 pages. Latex file. Version 2: References added
arxiv created 2006/10/18 · openalex publication_date 2006/12/21 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We assume that our universe originated from highly excited and interacting strings with coupling constant gs=O(1). Fluctuations of spacetime geometry are large in such strings and the physics dictating the emergence of a final spacetime configuration is not known. We propose that, nevertheless, it is determined by an entropic principle that the final spacetime configuration must have maximum entropy for a given amount of energy. This principle implies, under some assumptions, that the spacetime configuration that emerges finally is a (3+1)-dimensional FRW universe filled with w=1 perfect fluid and with 6-dimensional compact space of size ls; in particular, the number of large spacetime dimensions is d=3+1. Such an universe may evolve subsequently into our universe, perhaps as in Banks–Fischler scenario.