247 citations · 2.1k across the 43 of their papers we have counts for
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Topological Superconductors on Superstring Worldsheets
Justin Kaidi, Julio Parra-Martinez, Yuji Tachikawa +1
We point out that different choices of Gliozzi-Scherk-Olive (GSO) projections in superstring theory can be conveniently understood by the inclusion of fermionic invertible phases,…
Non-renormalization and operator mixing via on-shell methods
Zvi Bern, Julio Parra-Martinez, Eric Sawyer
Using on-shell methods, we present a new perturbative non-renormalization theorem for operator mixing in massless four-dimensional quantum field theories. By examining how unitarit…
Logarithmic forms and differential equations for Feynman integrals
Enrico Herrmann, Julio Parra-Martinez
We describe how a dlog representation of Feynman integrals leads to simple differential equations. We derive these differential equations directly in loop momentum or embedding spa…
Gravity loop integrands from the ultraviolet
Alex Edison, Enrico Herrmann, Julio Parra-Martinez +1
We demonstrate that loop integrands of (super-)gravity scattering amplitudes possess surprising properties in the ultraviolet (UV) region. In particular, we study the scaling of mu…
GSO projections via SPT phases
Justin Kaidi, Julio Parra-Martinez, Yuji Tachikawa
We point out that the choice of phases in GSO projections can be accounted for by a choice of fermionic SPT phases on the worldsheet of the string. This point of view not only easi…
Two-loop n-point anomalous amplitudes in N=4 supergravity
Zvi Bern, David Kosower, Julio Parra-Martinez
We compute the anomalous two-loop four-point amplitudes in N=4 pure supergravity, using unitarity and the double-copy construction. We also present all terms determined by four-dim…