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Fricke S-duality in CHL models

Daniel Persson (Institutionen för fundamental fysik) ; R. Volpato
Journal of High Energy Physics (1126-6708). Vol. 2015 (2015), 12, p. 1-55.
[Artikel, refereegranskad vetenskaplig]

© 2015, The Author(s). Abstract: We consider four dimensional CHL models with sixteen spacetime supersymmetries obtained from orbifolds of type IIA superstring on K3×T2 by a ℤN symmetry acting (possibly) non-geometrically on K3. We show that most of these models (in particular, for geometric symmetries) are self-dual under a weak-strong duality acting on the heterotic axio-dilaton modulus S by a “Fricke involution” S → −1/NS. This is a novel symmetry of CHL models that lies outside of the standard SL(2ℤ)-symmetry of the parent theory, heterotic strings on T6. For self-dual models this implies that the lattice of purely electric charges is N-modular, i.e. isometric to its dual up to a rescaling of its quadratic form by N. We verify this prediction by determining the lattices of electric and magnetic charges in all relevant examples. We also calculate certain BPS-saturated couplings and verify that they are invariant under the Fricke S-duality. For CHL models that are not self-dual, the strong coupling limit is dual to type IIA compactified on T6/ℤN, for some ℤN-symmetry preserving half of the spacetime supersymmetries.

Nyckelord: Extended Supersymmetry , Space-Time Symmetries , String Duality

Denna post skapades 2016-05-11.
CPL Pubid: 236250


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Institutionen för fundamental fysik (2005-2015)



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