scholarly journals MPL—A program for computations with iterated integrals on moduli spaces of curves of genus zero

2016 ◽  
Vol 203 ◽  
pp. 339-353 ◽  
Author(s):  
Christian Bogner
Keyword(s):  
Moduli Spaces ◽  
Genus Zero ◽  
Iterated Integrals ◽  
Moduli Spaces Of Curves

scholarly journals Single-valued integration and double copy

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Francis Brown ◽  
Clément Dupont
Keyword(s):  
Moduli Spaces ◽  
Modular Forms ◽  
Differential Forms ◽  
Smooth Projective Variety ◽  
Genus Zero ◽  
Moduli Spaces Of Curves ◽  
Multiple Zeta ◽  
De Rham ◽  
Zeta Values ◽  
Double Copy

AbstractIn this paper, we study a single-valued integration pairing between differential forms and dual differential forms which subsumes some classical constructions in mathematics and physics. It can be interpreted as a p-adic period pairing at the infinite prime. The single-valued integration pairing is defined by transporting the action of complex conjugation from singular to de Rham cohomology via the comparison isomorphism. We show how quite general families of period integrals admit canonical single-valued versions and prove some general formulae for them. This implies an elementary “double copy” formula expressing certain singular volume integrals over the complex points of a smooth projective variety as a quadratic expression in ordinary period integrals of half the dimension. We provide several examples, including non-holomorphic modular forms, archimedean Néron–Tate heights on curves, single-valued multiple zeta values and polylogarithms. The results of the present paper are used in [F. Brown and C. Dupont, Single-valued integration and superstring amplitudes in genus zero, preprint 2019, https://arxiv.org/abs/1910.01107] to prove a recent conjecture of Stieberger which relates the coefficients in a Laurent expansion of two different kinds of periods of twisted cohomology on the moduli spaces of curves {\mathcal{M}_{0,n}} of genus zero with n marked points. We also study a morphism between certain rings of “motivic” periods, called the de Rham projection, which provides a bridge between complex periods and single-valued periods in many situations of interest.

scholarly journals Moduli spaces of curves with homology chains and c = 1 matrix models

1994 ◽  
Vol 327 (3-4) ◽  
pp. 221-225 ◽  
Author(s):  
A.S. Cattaneo ◽  
A. Gamba ◽  
M. Martellini
Keyword(s):  
Matrix Models ◽  
Moduli Spaces ◽  
Moduli Spaces Of Curves

scholarly journals Cyclic operad formality for compactified moduli spaces of genus zero surfaces

2012 ◽  
Vol 364 (11) ◽  
pp. 5881-5911 ◽  
Author(s):  
Jeffrey Giansiracusa ◽  
Paolo Salvatore
Keyword(s):  
Moduli Spaces ◽  
Genus Zero

scholarly journals A dilogarithm identity on moduli spaces of curves

2014 ◽  
Vol 97 (2) ◽  
pp. 255-274 ◽  
Author(s):  
Feng Luo ◽  
Ser Peow Tan
Keyword(s):  
Moduli Spaces ◽  
Moduli Spaces Of Curves
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