On R**4 threshold corrections in IIb string theory and (p, q) string instantons

Jul, 1997
22 pages
Published in:
  • Nucl.Phys.B 508 (1997) 509-534
e-Print:
Report number:
  • CERN-TH-97-146,
  • CPTH-S539-0697

Citations per year

19972004201120182025051015
Abstract:
We obtain the exact non-perturbative thresholds of R4R^4 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 (p,q)(p,q)-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 SL(2,Z)SL(2,Z) and a order-3/2 Eisenstein series for SL(3,Z)SL(3,Z). The seven-dimensional result is given by the order-3/2 Eisenstein series for SL(5,Z)SL(5,Z). 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