Issues on tadpoles and vacuum redefinitions in String Theory

Acknowledgments......Page 5
Introduction......Page 9
The action......Page 27
Light-cone quantization......Page 31
One-loop vacuum amplitudes......Page 35
The torus partition function......Page 41
The orientifold projection......Page 46
Toroidal compactification......Page 55
Orbifolds in general and an example: S1/Z2......Page 64
Orbifold T4/Z2......Page 67
The 0A and 0B models......Page 77
Scherk-Schwarz deformations......Page 83
Momentum shifts......Page 84
Winding shifts......Page 86
Brane supersymmetry breaking......Page 88
Supersymmetry breaking and magnetic deformations......Page 92
An introduction to the problem......Page 101
``Wrong vacua\'\' and the effective action......Page 104
The end point of the resummation flow......Page 108
 On Newton\'s Tangent Method and the Quartic Potential......Page 119
Codimension one......Page 121
Higher codimension......Page 125
On the inclusion of gravity......Page 127
Evidence for a new link between string vacua......Page 131
Threshold corrections in open strings and NS-NS tadpoles......Page 138
Background field method......Page 140
Sugimoto model......Page 142
Brane supersymmetry breaking......Page 146
Brane-antibrane systems......Page 152
Type 0B......Page 156
Conclusions......Page 159
-functions......Page 161
Bibliography......Page 163