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|Title: ||Issues on tadpoles and vacuum redefinitions in String Theory|
|Authors: ||Sagnotti, Augusto|
|Issue Date: ||8-Mar-2006 |
|Abstract: ||“Issues on tadpoles and vacuum redefinitions in String Theory”
This Thesis is devoted to the problem of NS-NS tadpoles, bosonic one-point functions going into the vacuum that typically emerge in String Theory after supersymmetry breaking. These theories contain bosonic fields in two sectors, commonly denoted with NS-NS and R-R. While R-R tadpoles typically signal an inconsistency, like the presence of quantum anomalies in the case of a compact internal space, and thus in general must be cancelled, NS-NS tadpoles are associated to redefinitions of the background, as first stressed by Fischler and Susskind in the eighties. In particular, in Type I String Theory NS-NS tadpoles emerge already at the disk level and, from a space-time viewpoint, correspond to configurations of D-branes and orientifold planes with a non-vanishing tension giving rise to a net gravitational attraction that curves the background space-time.
Up to now one is able to perform efficient string co...|
|Appears in Collections:||Tesi di dottorato in scienze matematiche e fisiche|
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