Brane cosmology
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Brane cosmology refers to several theories in particle physics and cosmology related to string theory, superstring theory and M-theory.
Brane and bulk
The central idea is that the visible,
Why gravity is weak and the cosmological constant is small
Some versions of brane cosmology, based on the
Models of brane cosmology
One of the earliest documented attempts to apply brane cosmology as part of a conceptual theory is dated to 1983.[5]
The authors discussed the possibility that the Universe has dimensions, but ordinary particles are confined in a potential well which is narrow along spatial directions and flat along three others, and proposed a particular five-dimensional model.
In 1998/99, Merab Gogberashvili published on arXiv a number of articles where he showed that if the Universe is considered as a thin shell (a mathematical synonym for "brane") expanding in 5-dimensional space then there is a possibility to obtain one scale for particle theory corresponding to the 5-dimensional cosmological constant and Universe thickness, and thus to solve the hierarchy problem.[6][7] Gogberashvili also showed that the four-dimensionality of the Universe is the result of the stability requirement found in mathematics since the extra component of the Einstein field equations giving the confined solution for matter fields coincides with one of the conditions of stability.[8]
In 1999, there were proposed the closely related Randall–Sundrum scenarios, RS1 and RS2. (See Randall–Sundrum model for a nontechnical explanation of RS1). These particular models of brane cosmology have attracted a considerable amount of attention. For instance, the related Chung-Freese model, which has applications for spacetime metric engineering, followed in 2000.[9]
Later, the
Empirical tests
As of now, no experimental or observational evidence of
See also
References
- ^ "Session D9 - Experimental Tests of Short Range Gravitation". flux.aps.org.
- S2CID 14612396.
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- .
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- ^ Musser, George; Minkel, JR (2002-02-11). "A Recycled Universe: Crashing branes and cosmic acceleration may power an infinite cycle in which our universe is but a phase". Scientific American Inc. Retrieved 2008-05-03.
- S2CID 118488193.
- S2CID 88504420.
- ^ Freeland, Emily (2018-09-21). "Hunting for extra dimensions with gravitational waves". The Oskar Klein Centre for Cosmoparticle Physics blog. Archived from the original on 2021-01-27. Retrieved 2018-11-30.
External links
- Brane cosmology on arxiv.org
- S2CID 9623407. – Cosmological consequences of the brane world scenario are reviewed in a pedagogical manner.
- Dimensional Shortcuts - evidence for sterile neutrino; (August 2007; Scientific American)
- S2CID 9751130. – These notes (32 pages) give an introductory review on brane cosmology.
- , September 2001.