On R**4 threshold corrections in IIb string theory and (p, q) string instantons
Jul, 199722 pages
Published in:
- Nucl.Phys.B 508 (1997) 509-534
e-Print:
- hep-th/9707018 [hep-th]
Report number:
- CERN-TH-97-146,
- CPTH-S539-0697
Citations per year
Abstract:
We obtain the exact non-perturbative thresholds of terms in IIB string theory compactified to eight and seven dimensions. These thresholds are given by the perturbative tree-level and one-loop results together with the contribution of the D-instantons and of the -string instantons. The invariance under U-duality is made manifest by rewriting the sum as a non-holomorphic modular function of the corresponding discrete U-duality group. In the eight-dimensional case, the threshold is the sum of a order-1 Eisenstein series for and a order-3/2 Eisenstein series for . The seven-dimensional result is given by the order-3/2 Eisenstein series for . We also conjecture formulae for the non-perturbative thresholds in lower dimensional compactifications and discuss the relation with M-theory.Note:
- 24 pages, Latex, eqs. (3.8) and (4.2) corrected Report-no: CERN-TH/97-146, CPTH-S539.0697 Journal-ref: Nucl.Phys. B508 (1997) 509-534
- 11.25.-w
- 11.25.Sq
- 11.30.Pb
- Gravitational corrections
- Non-perturbativeeffects
- D-instantons
- ( p , q )-strings
- U -duality
- Eisenstein series
- ( p, q)-strings
References(29)
Figures(0)