• DOI:10.1007/s10714-007-0488-1
• Corpus ID: 18918431

Entropy of anisotropic universe and fractional branes

@article{Rama2007EntropyOA,
  title={Entropy of anisotropic universe and fractional branes},
  author={S. Kalyana Rama},
  journal={General Relativity and Gravitation},
  year={2007},
  volume={39},
  pages={1773-1788}
}

• S. Rama
• Published 26 February 2007
• Mathematics
• General Relativity and Gravitation

AbstractWe obtain the entropy of a homogeneous anisotropic universe applicable, by assumption, to the fractional branes in the universe in the model of Chowdhury and Mathur. The entropy for the 3 or 4 charge fractional branes thus obtained is not of the expected form $$E^\frac{3}{2}$$ or E2. One way the expected form is realised is if
p → ρ for the transverse directions and if the compact directions remain constant in size. These conditions are likely to be enforced by brane decay and annihilation, and by the S, T, U dualities. T duality is also likely to exclude high entropic cases, found in the examples, which arise due to the compact space contracting to zero size. Then the 4 charge fractional branes may indeed provide a detailed realisation of the maximum entropic principle we proposed recently to determine the number (3 +  1) of large spacetime dimensions.