Singularities in String Theory
Singularities in String Theory
Singularities in String Theory
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Str<strong>in</strong>g theory on orbifolds<br />
Dixon, Harvey, Vafa, Witten<br />
• The extended nature of str<strong>in</strong>g theory <strong>in</strong>troduces<br />
additional degrees of freedom localized at the tip of<br />
the cone: twisted sectors.<br />
twisted sectors<br />
• Includ<strong>in</strong>g the twisted sectors, str<strong>in</strong>g S-matrix S<br />
is<br />
unitary and physics is completely smooth <strong>in</strong><br />
perturbation theory.
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