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‘In’ and ‘out’ vertex operators in a class of UV-finite nonlinear σ-models

✍ Scribed by C. Klimčík

Book ID
104764859
Publisher
Springer
Year
1991
Tongue
English
Weight
463 KB
Volume
21
Category
Article
ISSN
0377-9017

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✦ Synopsis

In' and 'out' scalar vertex operators are constructed perturbatively in a class of recently discovered UV finite nonlinear a-models describing the string evolution in gravitational plane wave backgrounds. They exhibit peculiar singularities in the target space related to the focusing phenomena in such backgrounds well known from the classical and quantum gravity theories. The computation is performed up to three loops of the usual perturbation expansion and to all loops of the weak field limit. An argument is given that the vertex operator singularities should persist, even when summing up the all perturbation expansions.

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