Computing theR4term at two Superstring Loops

2002/02/09 by Roberto Iengo · 3 citations
Physics and Astronomy · #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #Particle physics theoretical and experimental studies #hep-th

paper · pdf · doi:10.1088/1126-6708/2002/02/035

published as JHEP 0202 (2002) 035 · 6 pages, Latex

arxiv created 2002/02/09 · openalex publication_date 2002/02/25 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/29

Abstract

We use a previously derived integral representation for the four graviton amplitude at two loops in Superstring theory, whose leading term for vanishing momenta gives the two-loop contribution to the R⁴ term in the Effective Action. We find by an explicit computation that this contribution is zero, in agreement with a general argument implying the vanishing of the R⁴ term beyond one loop.

Citations

• Effects of D-instantons

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