Two-loop string theory on null compactifications

H. C D Cove, Richard J. Szabo

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


We compute the two-loop contributions to the free energy in the null compactification of perturbative string theory at finite temperature. The cases of bosonic, type II and heterotic strings are all treated. The calculation exploits an explicit reductive parametrization of the moduli space of infinite-momentum frame string worldsheets in terms of branched cover instantons. Various arithmetic and physical properties of the instanton sums are described. Applications to symmetric product orbifold conformal field theories and to the matrix string theory conjecture are also briefly discussed. © 2006 Elsevier B.V. All rights reserved.

Original languageEnglish
Pages (from-to)313-352
Number of pages40
JournalNuclear Physics B
Issue number1-2
Publication statusPublished - 1 May 2006


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