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Walking the landscape: The distribut...

Saltman, Alexander Harry.

Walking the landscape: The distribution and evolution of string theory vacua.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Walking the landscape: The distribution and evolution of string theory vacua.
Author:	Saltman, Alexander Harry.
Description:	86 p.
Notes:	Adviser: Eva Silverstein.
Notes:	Source: Dissertation Abstracts International, Volume: 67-09, Section: B, page: 5165.
Contained By:	Dissertation Abstracts International67-09B.
Subject:	Physics, Theory.
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3235338
ISBN:	9780542895753

Walking the landscape: The distribution and evolution of string theory vacua.
Saltman, Alexander Harry.

Walking the landscape: The distribution and evolution of string theory vacua. - 86 p.

Adviser: Eva Silverstein.

Thesis (Ph.D.)--Stanford University, 2006.

The number of perturbatively stable compactifications of string theory appears to be quite large, even when limited to those with a cosmological constant. Although the richness of this "landscape" of vacua may offer solutions to some outstanding problems, notably the cosmological constant problem, it also may dramatically reduce the predictivity of string theory. I demonstrate two classes of vacua that have so far been little explored, but that are quite possibly larger than the more well-known classes. In addition to enumerating possible vacua, it is necessary to study the selection rules that may govern the probability of ending up in a particular vacuum starting from a hot, small early universe. To this end, I also discuss certain topology-changing transitions between string compactifications that progress through the condensation of a tachyon, and therefore are essentially irreversible. These transitions have distinct low-energy signatures and suggest that string theory may have a preference for topologically simple compactifications.

ISBN: 9780542895753Subjects--Topical Terms:

264127
Physics, Theory.

Walking the landscape: The distribution and evolution of string theory vacua.
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502 $a Thesis (Ph.D.)--Stanford University, 2006.
520 # $a The number of perturbatively stable compactifications of string theory appears to be quite large, even when limited to those with a cosmological constant. Although the richness of this "landscape" of vacua may offer solutions to some outstanding problems, notably the cosmological constant problem, it also may dramatically reduce the predictivity of string theory. I demonstrate two classes of vacua that have so far been little explored, but that are quite possibly larger than the more well-known classes. In addition to enumerating possible vacua, it is necessary to study the selection rules that may govern the probability of ending up in a particular vacuum starting from a hot, small early universe. To this end, I also discuss certain topology-changing transitions between string compactifications that progress through the condensation of a tachyon, and therefore are essentially irreversible. These transitions have distinct low-energy signatures and suggest that string theory may have a preference for topologically simple compactifications.
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