String threshold corrections in models with spontaneously broken supersymmetry
- ,
- ,
- ,
- J. Rizos()
- CERN and
- Ioannina U.
59 pages
Published in:
- Nucl.Phys.B 540 (1999) 87-148
e-Print:
- hep-th/9807067 [hep-th]
Report number:
- CERN-TH-97-44,
- NEIP-97-007,
- IOA-97-08,
- LPTENS-97-11,
- CPTH-S499-0397,
- CPTH-S499.0397
Citations per year
Abstract: (Elsevier)
We analyse a class of four-dimensional heterotic ground states with N = 2 space-time supersymmetry. From the ten-dimensional perspective, such models can be viewed as compactifications on a six-dimensional manifold with SU (2) holonomy, which is locally but not globally K 3 × T 2 . The maximal N = 4 supersymmetry is spontaneously broken to N = 2. The masses of the two massive gravitinos depend on the ( T, U ) moduli of T 2 . We evaluate the one-loop threshold corrections of gauge and R 2 couplings and we show that they fall in several universality classes, in contrast to what happens in usual K 3 × T 2 compactifications, where the N = 4 supersymmetry is explicitly broken to N = 2, and where a single universality class appears. These universality properties follow from the structure of the elliptic genus. The behaviour of the threshold corrections as functions of the moduli is analysed in detail: it is singular across several rational lines of the T 2 moduli because of the appearance of extra massless states, and suffers only from logarithmic singularities at large radii. These features differ substantially from the ordinary K 3 × T 2 compactifications, thereby reflecting the existence of spontaneously broken N = 4 supersymmetry. Although our results are valid in the general framework defined above, we also point out several properties, specific to orbifold constructions, which might be of phenomenological relevance.Note:
- 59 pages, Latex2e, final version to appear in Nucl. Phys. B
- supersymmetry: spontaneously broken
- threshold: correction
- string model
- universality
- ground state: heterotic
- moduli space
- compactification
- coupling
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