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R-charge Conservation and More in Factorizable and Non-Factorizable Orbifolds | | Nana Geraldine Cabo Bizet
; Tatsuo Kobayashi
; Damian Kaloni Mayorga Pena
; Susha L. Parameswaran
; Matthias Schmitz
; Ivonne Zavala
; | | Date: |
10 Jan 2013 | | Abstract: | We consider the string theory origin of R-charge conservation laws in
heterotic orbifold compactifications, deriving the corresponding string
coupling selection rule for factorizable and non-factorizable orbifolds, with
prime ordered and non-prime ordered point groups. R-charge conservation arises
due to symmetries among the worldsheet instantons that can mediate the
couplings. Among our results is a previously missed non-trivial contribution to
the conserved R-charges from the Gamma-phases in non-prime orbifolds, which
weakens the R-charge selection rule. Symmetries among the worldsheet instantons
can also lead to additional selection rules for some couplings. We make a
similar analysis for Rule 4 or the ’torus lattice selection rule’. Moreover, we
identify a new string selection rule, that we call Rule 6 or the ’coset vector
selection rule’. | | Source: | arXiv, 1301.2322 | | Services: | Forum | Review | PDF | Favorites | |
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