Browsing by Author "Zavala, Ivonne"

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  • Discrete R-symmetries and anomaly universality in heterotic orbifolds 
    Bizet, Nana G. Cabo; Kobayashi, Tatsuo; Peña, Damián K. Mayorga; Parameswaran, Susha L.; Schmitz, Matthias; Zavala, Ivonne (New York : Springer, 2014)
    We study discrete R-symmetries, which appear in the 4D low energy effective field theory derived from heterotic orbifold models. We derive the R-symmetries directly from the geometrical symmetries of the orbifolds. In ...
  • Erratum: Revisiting coupling selection rules in heterotic orbifold models (Journal of High Energy Physics (2012) 05 (008)) 
    Kobayashi, Tatsuo; Parameswaran, Susha L.; Ramos-Sánchez, Saul; Zavala, Ivonne (Heidelberg : Springer Verlag, 2012)
    Erratum to: Revisiting coupling selection rules in heterotic orbifold models in: Journal of High Energy Physics (2012) 05:8
  • Lifshitz black holes in IIA supergravity 
    Barclay, Luke; Gregory, Ruth; Parameswaran, Susha L.; Tasinato, Gianmassimo; Zavala, Ivonne (Heidelberg : Springer Verlag, 2012)
    We compute string theoretic black hole solutions having Lifshitz asymptotics with a general dynamical exponent z > 1. We start by constructing solutions in a flux compactification of six dimensional supergravity, then ...
  • R-charge conservation and more in factorizable and non-factorizable orbifolds 
    Bizet, Nana G. Cabo; Kobayashi, Tatsuo; Pena, Damian K. Mayorga; Parameswaran, Susha L.; Schmitz, Matthias; Zavala, Ivonne (New York, NY : Springer International Publishing, 2013)
    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 ...
  • Revisiting coupling selection rules in heterotic orbifold models 
    Kobayashi, Tatsuo; Parameswaran, Susha L.; Ramos-Sánchez, Saul; Zavala, Ivonne (Heidelberg : Springer Verlag, 2012)
    We study L-point couplings between twisted sector fields in heterotic orbifold compactifications, using conformal field theory. Selection rules provide an easy way to identify which couplings are non-vanishing. Those used ...