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Gravity and Strings

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484 From eleven to four dimensions<br />

certainly not asymptotically the KK vacuum. There seems to be no clear reason to expect<br />

these two backgrounds, which are related by Buscher’s rules, to be equivalent for strings in<br />

the st<strong>and</strong>ard sense of interchange of KK <strong>and</strong> winding modes. Nevertheless, the two backgrounds<br />

are related by Buscher’s rules <strong>and</strong> there seems to be no reason why supersymmetry<br />

should disappear [32]. It has been suggested that supersymmetry is still present but realized<br />

non-locally [504]. For the moment, there is no definite physical explanation for this<br />

phenomenon.

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