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Topics in two-dimensional field theo...

Harvard University.

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Topics in two-dimensional field theory and heterotic string theory.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Topics in two-dimensional field theory and heterotic string theory./
Author:	Lapan, Joshua Michael.
Description:	174 p.
Notes:	Adviser: Andrew Strominger.
Contained By:	Dissertation Abstracts International69-04B.
Subject:	Physics, Elementary Particles and High Energy. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3312429
ISBN:	9780549613930

Topics in two-dimensional field theory and heterotic string theory.
Lapan, Joshua Michael.

Topics in two-dimensional field theory and heterotic string theory. - 174 p.

Adviser: Andrew Strominger.

Thesis (Ph.D.)--Harvard University, 2008.

We study a myriad of topics related to string theories in two dimensions and/or to heterotic string theories. In chapter 2, we use the duality of two-dimensional string theory with matrix models to study arbitrary time-dependent backgrounds. As an example, we study the case of a Fermi droplet cosmology and analyze properties of the coordinates in which the metric is trivial; we also comment on the form of the interaction terms in these coordinates.

ISBN: 9780549613930Subjects--Topical Terms:

1019488
Physics, Elementary Particles and High Energy.

Topics in two-dimensional field theory and heterotic string theory.
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020 $a 9780549613930
035 $a (UMI)AAI3312429
035 $a AAI3312429
040 $a UMI $c UMI
100 1 $a Lapan, Joshua Michael. $3 1035998
245 1 0 $a Topics in two-dimensional field theory and heterotic string theory.
300 $a 174 p.
500 $a Adviser: Andrew Strominger.
500 $a Source: Dissertation Abstracts International, Volume: 69-04, Section: B, page: 2393.
502 $a Thesis (Ph.D.)--Harvard University, 2008.
520 $a We study a myriad of topics related to string theories in two dimensions and/or to heterotic string theories. In chapter 2, we use the duality of two-dimensional string theory with matrix models to study arbitrary time-dependent backgrounds. As an example, we study the case of a Fermi droplet cosmology and analyze properties of the coordinates in which the metric is trivial; we also comment on the form of the interaction terms in these coordinates.
520 $a Next, in chapter 3, we study dynamical D0-branes in N = 1, two-dimensional string theory as boundary states in the closed string sector. In particular, we find that there are four stable "falling" D0-branes (two branes and two anti-branes) in the type 0A projection and two unstable ones in the type 0B projection.
520 $a In chapter 4, we switch gears to study the heterotic string. We begin studying the massless spectrum of the non-Kahler, supersymmetric Fu-Yau compactification by counting zero modes of the linearized equations of motion for the gaugino. This can be rephrased as a cohomology problem which for a trivial gauge bundle reduces to the Dolbeault cohomology of the manifold, which we then compute.
520 $a We continue the study of Fu-Yau compactifications (and generalizations) in chapter 5, where we implicitly construct a worldsheet CFT as the IR limit of an N = 2 gauge theory. Spacetime torsion (non-Kahlerity) is incorporated via a two-dimensional Green-Schwarz mechanism in which a doublet of axions cancels the gauge anomaly. We also argue that these models are smoothly extendable to solutions of the exact beta-function equations. By string dualities, these solutions provide a microscopic description of certain type IIB RR-flux vacua.
520 $a Finally, in chapter 6 we use recent developments to argue that there exists a holographic dual for the CFT living on a stack of N heterotic strings in R 4,1 x T5; this should also be describable by an exact worldsheet CFT. We use supergravity to show that the global supergroup of the background is Osp(4*|4), with an affine extension given, surprisingly, by a nonlinear, N = 8 superconformal algebra. We also suggest a correspondence between supergroups with 16 supercharges and Tn compactification with 0 ≤ n ≤ 7.
590 $a School code: 0084.
650 4 $a Physics, Elementary Particles and High Energy. $3 1019488
650 4 $a Physics, Theory. $3 1019422
690 $a 0753
690 $a 0798
710 2 $a Harvard University. $3 528741
773 0 $t Dissertation Abstracts International $g 69-04B.
790 $a 0084
790 1 0 $a Strominger, Andrew, $e advisor
791 $a Ph.D.
792 $a 2008
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3312429