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pro vyhledávání: '"Mafra, Carlos R."'
Autor:
Mafra, Carlos R.
By analogy with the formula for the massless string disk amplitudes, we define massive field-theory tree amplitudes and conjecture that the BRST cohomology structure of pure spinor superspace fixes their form. We give evidence by deriving the pure sp
Externí odkaz:
http://arxiv.org/abs/2407.11849
We construct the unintegrated vertex operator at the first mass level of the open superstring from the OPE of massless vertices. Using BRST cohomology manipulations, the tree amplitude of two massless and one massive state is rewritten in terms of th
Externí odkaz:
http://arxiv.org/abs/2407.02436
We uncover a relation between the scattering amplitudes of massive strings and the $\alpha'$ expansion of the massless string amplitude at tree level. More precisely, the n-point tree amplitude of n-1 massless and one massive state is written as a li
Externí odkaz:
http://arxiv.org/abs/2311.12100
Autor:
Mafra, Carlos R., Schlotterer, Oliver
We give a comprehensive review of recent developments on using the pure spinor formalism to compute massless superstring scattering amplitudes at tree level. The main results of the pure spinor computations are placed into the context of related topi
Externí odkaz:
http://arxiv.org/abs/2210.14241
Autor:
Berkovits, Nathan, Mafra, Carlos R.
The pure spinor formalism for the superstring has the advantage over the more conventional Ramond-Neveu-Schwarz formalism of being manifestly spacetime supersymmetric, which simplifies the computation of multiparticle and multiloop amplitudes and all
Externí odkaz:
http://arxiv.org/abs/2210.10510
Autor:
Mafra, Carlos R.
Publikováno v:
JHEP 03 (2022) 012
Inspired by the definition of color-dressed amplitudes in string theory, we define analogous {\it color-dressed permutations} replacing the color-ordered string amplitudes by their corresponding permutations. Decomposing the color traces into symmetr
Externí odkaz:
http://arxiv.org/abs/2108.01081
Autor:
Bridges, Elliot, Mafra, Carlos R.
We obtain local numerators satisfying the BCJ color-kinematics duality at one loop for super-Yang-Mills theory in ten dimensions. This is done explicitly for six points via the field-theory limit of the genus-one open superstring correlators for diff
Externí odkaz:
http://arxiv.org/abs/2102.12943
We develop new mathematical tools for the study of the double copy and colour-kinematics duality for tree-level scattering amplitudes using the properties of Lie polynomials. We show that the $S$-map that was defined to simplify super-Yang--Mills mul
Externí odkaz:
http://arxiv.org/abs/2012.00519
Autor:
Mafra, Carlos R.
Publikováno v:
Algebraic Combinatorics, Resurgence, Moulds and Applications (CARMA) (2020): 349-365
These notes are a written version of my talk given at the CARMA workshop in June 2017, with some additional material. I presented a few concepts that have recently been used in the computation of tree-level scattering amplitudes (mostly using pure sp
Externí odkaz:
http://arxiv.org/abs/2011.14413
We relate the low-energy expansions of world-sheet integrals in genus-one amplitudes of open- and closed-string states. The respective expansion coefficients are elliptic multiple zeta values in the open-string case and non-holomorphic modular forms
Externí odkaz:
http://arxiv.org/abs/2010.10558