240 citations · 2.5k across the 73 of their papers we have counts for
8 papers · 1 filter
Open String Amplitudes: Singularities, Asymptotics, and New Representations
Nima Arkani-Hamed, Carolina Figueiredo, Grant N. Remmen
Open string amplitudes at tree level have been studied for over fifty years, but there is no known analytic form for general -point amplitudes, and their conventional representa…
Accidental Symmetry Near Extreme Spinning Black Holes
Avik Banerjee, Achilleas P. Porfyriadis, Grant N. Remmen
Near the horizon of extremal charged black holes, an accidental symmetry is known to act on zero-temperature perturbations, transforming them into finite-temperature ones. In this…
Positively Identifying HEFT or SMEFT
Grant N. Remmen, Nicholas L. Rodd
We establish the bounds on Wilson coefficients of the Higgs effective field theory (HEFT) mandated by unitarity and analyticity. These positivity constraints can be projected into…
LHC EFT WG Note: Basis for Anomalous Quartic Gauge Couplings
Gauthier Durieux, Grant N. Remmen, Nicholas L. Rodd +5
In this note, we give a definitive basis for the dimension-eight operators leading to quartic -- but no cubic -- interactions among electroweak gauge bosons. These are often called…
Uniqueness Criteria for the Virasoro-Shapiro Amplitude
Clifford Cheung, Aaron Hillman, Grant N. Remmen
The scattering amplitudes of string theory exhibit many extraordinary properties. But are they the unique mathematical objects to do so? Recently, it has been shown how the spectru…
Bootstrap Principle for the Spectrum and Scattering of Strings
Clifford Cheung, Aaron Hillman, Grant N. Remmen
We show that the Veneziano amplitude of string theory is the unique solution to an analytically solvable bootstrap problem. Uniqueness follows from two assumptions: faster than pow…
Sudden breakdown of effective field theory near cool Kerr-Newman black holes
Gary T. Horowitz, Maciej Kolanowski, Grant N. Remmen +1
It was recently shown that (near-)extremal Kerr black holes are sensitive probes of small higher-derivative corrections to general relativity. In particular, these corrections prod…
Positivity in Amplitudes and Quantum Entanglement
Rafael Aoude, Gilly Elor, Grant N. Remmen +1
We explore the connection of positivity of the imaginary part of forward elastic amplitudes for perturbative scattering with consistency of the entanglement generated by the S-matr…