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One-loop matrix elements of effective superstring interactions : α'-expanding loop integrands
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- Edison, Alex (author)
- Uppsala universitet,Teoretisk fysik
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- Guillen, Max (author)
- Uppsala universitet,Teoretisk fysik
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- Johansson, Henrik (author)
- Stockholms universitet,Uppsala universitet,Teoretisk fysik,Stockholm Univ, Nordita, Hannes Alfvens Vag 12, S-10691 Stockholm, Sweden; KTH Royal Inst Technol, Hannes Alfvens Vag 12, S-10691 Stockholm, Sweden,Nordiska institutet för teoretisk fysik (Nordita),Uppsala University, Sweden
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- (creator_code:org_t)
- Springer Nature, 2021
- 2021
- English.
- In: Journal of High Energy Physics (JHEP). - : Springer Nature. - 1126-6708 .- 1029-8479. ; :12
- Journal article (peer-reviewed)
Abstract
Subject headings
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- In the low-energy effective action of string theories, non-abelian gauge interactions and supergravity are augmented by infinite towers of higher-mass-dimension operators. We propose a new method to construct one-loop matrix elements with insertions of operators D2k Fn and D2k Rn in the tree-level effective action of type-I and type-II superstrings. Inspired by ambitwistor string theories, our method is based on forward limits of moduli-space integrals using string tree-level amplitudes with two extra points, expanded in powers of the inverse string tension α′. Similar to one-loop ambitwistor computations, intermediate steps feature non-standard linearized Feynman propagators which eventually recombine to conventional quadratic propagators. With linearized propagators the loop integrand of the matrix elements obey one-loop versions of the monodromy and KLT relations. We express a variety of four- and five-point examples in terms of quadratic propagators and formulate a criterion on the underlying genus-one correlation functions that should make this recombination possible at all orders in α′. The ultraviolet divergences of the one-loop matrix elements are crosschecked against the non-separating degeneration of genus-one integrals in string amplitudes. Conversely, our results can be used as a constructive method to determine degenerations of elliptic multiple zeta values and modular graph forms at arbitrary weight.
Subject headings
- NATURVETENSKAP -- Fysik -- Annan fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Other Physics Topics (hsv//eng)
- NATURVETENSKAP -- Fysik -- Subatomär fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Subatomic Physics (hsv//eng)
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
Keyword
- Scattering Amplitudes
- Superstrings and Heterotic Strings
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- art (subject category)
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