PIRSA:08090003  ( Flash Presentation , Windows Presentation , Windows Video File , MP3 , PDF) Which Format?

Speaker(s): Jacques Distler

Abstract: I will report on some work in progress with Dan Freed and Greg Moore. In an orientifold background, D-brane charge takes values in a certain twisted version of KR Theory. Moreover, there is a nontrivial background charge ('tadpole'). Up 'til now, this background charge has only been calculated rationally -- i.e., ignoring torsion. We derive a formula for it, over the integers. Only after 'inverting 2', does the charge localize to the fixed point sets of the orientifold action, and we can give a compact formula for it. This reproduces the previously known rational results, but contains new information.

Date: 09/09/2008 - 11:00 am

Series: String Seminars

URL: http://pirsa.org/08090003/  Share: