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D-branes, Fluxes and Time-dependence in string theory

English title D-branes, Fluxes and Time-dependence in string theory
Applicant Gaberdiel Matthias
Number 103332
Funding scheme Project funding (Div. I-III)
Research institution Institut für Theoretische Physik ETH Zürich
Institution of higher education ETH Zurich - ETHZ
Main discipline Theoretical Physics
Start/End 01.04.2004 - 31.03.2006
Approved amount 272'949.00
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Keywords (5)

STINGTHEORIE; D-BRANES; KONFORME FELDTHEORIE; String theory; Conformal field theory

Lay Summary (English)

Lay summary
String theory is currently the most promising candidate for a unifyingframework to describe the standard model of particle physics, as well asgeneral relativity. The advent of D-branes has revolutionised ourunderstanding of string theory, and in particular, opened the way toanalysenon-perturbative questions. Most work on D-branes has so far been done onstatic branes in background geometries without flux. Recent progress hasopened the way to overcome these limitations, and it would be veryinterestingto explore D-branes (as well as other aspects of string theory) in suchbackgrounds. In particular, it is important to gain insight into thenature oftime-dependence in string theory since this is crucialfor cosmological applications of the theory. Furthermore, stringbackgrounds with flux are believed to stabilise some of the moduli, andmay therefore be promising candidates for realistic string models ofour world.More specifically, I want to study certain time-dependent D-braneconfigurations. In particular, these include the D-brane with atravelling wave, the null D-brane-scissor configuration, as well asvarious s-branes. One of the aims is to analyse the important questionof how these D-brane configurations back-react to incomingperturbations (in the case of stable configurations), or how theydecay (if they are unstable). In order to address these questions itwill be important to understand the relation between the boundarystate descriptions of these D-branes and the corresponding openstring point of view in more detail.I also want to study D-branes in certain curved backgroundgeometries, in particular WZW models. It has been known for some timethat the known D-branes for these models do not account for all theK-theory charges that have been independently calculated. It wouldtherefore be interesting to attempt to construct the remainingD-branes. These branes may only preserve the conformal (orsuperconformal) symmetry, and it would be important from a conceptualpoint of view to understand their structure.Finally, I want to study pp-wave backgrounds that are generalisations ofthemaximally supersymmetric plane-wave geometry that has recently beenanalysedin detail. These geometries carry in general non-trivial RR flux, and itwillbe important to gain insight into such backgrounds. In particular, thisshouldbe feasible for backgrounds that lead to integrable field theories on theworld-sheet in light cone gauge. For example, it would be interesting tousetechniques from integrable field theories to determine the low-lyingspectrumof these theories, and analyse their D-branes.
Direct link to Lay Summary Last update: 21.02.2013

Responsible applicant and co-applicants


Associated projects

Number Title Start Funding scheme
112192 Supersymmetric D-Branes, integrability and time dependence in string theory 01.04.2006 Project funding (Div. I-III)