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Aspects of String Gas Cosmology: Cyc...

Marnerides, Stefanos.

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Aspects of String Gas Cosmology: Cyclic Models and Decompactification.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Aspects of String Gas Cosmology: Cyclic Models and Decompactification./
Author:	Marnerides, Stefanos.
Description:	204 p.
Notes:	Source: Dissertation Abstracts International, Volume: 71-12, Section: B, page: .
Contained By:	Dissertation Abstracts International71-12B.
Subject:	Physics, Theory. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3435216
ISBN:	9781124322872

Aspects of String Gas Cosmology: Cyclic Models and Decompactification.
Marnerides, Stefanos.

Aspects of String Gas Cosmology: Cyclic Models and Decompactification. - 204 p.

Source: Dissertation Abstracts International, Volume: 71-12, Section: B, page: .

Thesis (Ph.D.)--Columbia University, 2010.

String gas cosmology is a natural approach to cosmology within string theory. Two of its novelties are that it provides means to replace the singular evolution of the early universe with a smooth cyclic phase and that it suggests a dynamical mechanism for selecting at most three spatial dimensions that can grow large cosmologically. This thesis presents progress in these two directions.

ISBN: 9781124322872Subjects--Topical Terms:

1019422
Physics, Theory.

Aspects of String Gas Cosmology: Cyclic Models and Decompactification.
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020 $a 9781124322872
035 $a (UMI)AAI3435216
035 $a AAI3435216
040 $a UMI $c UMI
100 1 $a Marnerides, Stefanos. $3 1671152
245 1 0 $a Aspects of String Gas Cosmology: Cyclic Models and Decompactification.
300 $a 204 p.
500 $a Source: Dissertation Abstracts International, Volume: 71-12, Section: B, page: .
502 $a Thesis (Ph.D.)--Columbia University, 2010.
520 $a String gas cosmology is a natural approach to cosmology within string theory. Two of its novelties are that it provides means to replace the singular evolution of the early universe with a smooth cyclic phase and that it suggests a dynamical mechanism for selecting at most three spatial dimensions that can grow large cosmologically. This thesis presents progress in these two directions.
520 $a By implementing corrections to gravitational dynamics, we show how string gas cosmology gives rise to cyclic and bouncing models in the early universe. In these models entropy production naturally leads to an exit from the cyclic phase and drives an eventual transition to a radiation dominated, expanding universe. Further, between the cyclic and radiation phases, the scale factors can have long loitering phases that can address the horizon problem of standard big-bang cosmology.
520 $a We then address the decompactification mechanism, as originally suggested by Brandenberger and Vafa. This mechanism relies on the argument that winding string states generically intersect, and therefore interact appreciably, in at most three spatial dimensions. When these strings are not energetically favored they can decay to unwound strings and if not, they oppose the expansion of the dimensions they wrap. Since they interact efficiently in at most three dimensions this is the maximum number of dimensions that is allowed to expand. We show that a semiclassical treatment of fundamental string interactions makes this dimensional dependence manifest. This allows us to demonstrate in a cosmological setting that decompactification of d = 3 dimensions is largely favored over d > 3. We conclude with a study of the mechanism on anisotropic backgrounds.
590 $a School code: 0054.
650 4 $a Physics, Theory. $3 1019422
650 4 $a Physics, Elementary Particles and High Energy. $3 1019488
690 $a 0753
690 $a 0798
710 2 $a Columbia University. $3 571054
773 0 $t Dissertation Abstracts International $g 71-12B.
790 $a 0054
791 $a Ph.D.
792 $a 2010
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3435216