Results 21 to 30 of about 570 (144)
Topological amplitude computations using the pure spinor formalism
Journal of High Energy Physics, 2019 After constructing a simplified four-dimensional version of the b ghost, topological multiloop amplitudes in type II superstring theory compactified on a six-dimensional orbifold are computed using the non-minimal pure spinor formalism. These pure spinor
Nathan Berkovits, Luis Alberto Ypanaqué
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Integrating three-loop modular graph functions and transcendentality of string amplitudes
Journal of High Energy Physics, 2022 Modular graph functions (MGFs) are SL(2, ℤ)-invariant functions on the Poincaré upper half-plane associated with Feynman graphs of a conformal scalar field on a torus.
Eric D’Hoker, Nicholas Geiser
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Amplitudes involving massive states using pure spinor formalism
Journal of High Energy Physics, 2018 Same amplitudes evaluated independently using RNS and pure spinor formalism are expected to agree. While for massless states, this fact has been firmly established, for massive states such an explicit check has been lacking so far.
Subhroneel Chakrabarti +2 more
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Integrated massive vertex operator in pure spinor formalism
Journal of High Energy Physics, 2018 We construct the integrated vertex operator for the first massive states of open superstrings with (mass)2 = 1/α ′ in the pure spinor formalism of the superstring theory. This vertex operator is expressed in terms of the ten dimensional N = 1 $$ \mathcal{
Subhroneel Chakrabarti +2 more
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Supermoduli and PCOs at genus two
Journal of High Energy Physics, 2023 We illustrate the relation between supermoduli integration and picture changing operators (PCOs) particularly concerning the role of vertical integration, in the context of superstring vacuum amplitudes, by an explicit comparison of different ...
Charles Wang, Xi Yin
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Ambitwistor strings in six and five dimensions
Journal of High Energy Physics, 2021 Ambitwistor strings are chiral (holomorphic) strings whose target is the space of complex null geodesics, ambitwistor space. We introduce twistor representations of ambitwistor space in 6 and 5 dimensions.
Yvonne Geyer +2 more
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Theta expansion of first massive vertex operator in pure spinor
Journal of High Energy Physics, 2018 We provide the covariant superspace equations that are sufficient to determine the complete θ expansion of the vertex operator of the open string massive states with (mass)2 = 1/α′ in pure spinor formalism of superstring theory.
Subhroneel Chakrabarti +2 more
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SO(10)-like Superstring Standard Model with R-parity from the Heterotic String
, 2007 Submitted for the SUSY07 proceedings, 4 pages ...
Kim, Jihn E., Kim, Ji-Hun, Kyae, Bumseok
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A Note on the dS Swampland Conjecture, Non‐BPS Branes and K‐Theory
Fortschritte der Physik, Volume 67, Issue 11, November 2019., 2019 Abstract We point out that the de Sitter swampland conjecture would be falsified if classical fluxed Type IIA orientifold vacua with a single non‐BPS D7‐brane were indeed part of the string theory landscape. In other words, the dS swampland conjecture implies the cancellation of K‐theory charges on a compact space.
Ralph Blumenhagen +2 more
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Journal of High Energy Physics, 2023 The α ′-expansion of string theory provides a rich set of higher-dimension operators, indexed by ζ values, which can be used to study color-kinematics duality and the double copy. These two powerful properties, actually first noticed in tree-level string
Alex Edison, Micah Tegevi
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