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High Energy Theory Seminar

Friday, October 18, 2013
11:00am to 12:00pm
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Lauritsen 469
BPS, Non-BPS and D-brane anti D-brane effective actions in type II Superstring theory with their corrections to all orders in alpha-prime
Ehsan Hatefi, ICTP, Trieste,

In this talk , I would like to introduce new techniques for  deriving all kinds of effective actions ( including DBI ,Chern-Simons and Wess-Zumino for  BPS and non-BPS branes as well as  brane anti brane systems) to  all orders of alpha-prime for  type IIA,IIB Super string theories.
Motivated by arXive:1211.2413 (appeared in JHEP), 1211.5538 (appeared in JCAP) and  based on   super string amplitudes  we also talk about a universal conjecture  (involving BPS and non-BPS strings) for all higher derivative corrections in String theory . Making use  of  the scattering of Strings ,we  point out how to look for  all orders Super Yang-Mills  couplings   in type IIB(A) super string theories. The new effective actions for D-brane and anti D-brane within new couplings  with all their corrections will be presented.
Having taken S-matrix formalism, we  highlight several important comments on Myers action , its correct form and its application in M-theory,Ads/CFT .  These new actions/couplings are neither inside Myers'terms nor within pull-back/Taylor expansions. If time permits, I  would talk about selection rules and new ideas based on my recent attempts in this research topic.  Finally we comment on some related issues.

For more information, please contact Carol Silberstein by email at carol@theory.caltech.edu or visit http://theory.caltech.edu/people/seminar/.