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gr-qc2026
Nonlinear evolution in Galileon EFTs: Regularization and screening
Farid Thaalba, Aaron Held, Ramiro Cayuso +1
In a scalar effective field theory (EFT) with Galileon symmetry, we distinguish the strong-field expansion from the derivative expansion and study spherically symmetric classical n…
astro-ph.HE2026
Photon Ring Astrometry I: A Simple Spin Measurement Technique for High-Resolution Images of M87*
Delilah E. A. Gates, Dominic O. Chang, Aaron Held +1
The supermassive black hole M87* is a target for future horizon-scale imaging that will resolve the first lensed () sub-image of the photon ring. In this work, we iden…