Physics Seminar
Date: Wednesday, 5 February 2024
Time: 1.45 PM
Venue: Lecture Hall 2
QCD-Gravity double-copy in the Regge regime via shockwave collisions
Himanshu Raj
Stony Brook University, USA.
05-02-25

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Abstract

We present new results for gravitational wave radiation in ultrarelativistic collisions of black holes which are described as Aichelburg-Sexl shockwaves. We demonstrate that the effective “Lipatov” vertex governing graviton radiation is a mathematical double copy of the corresponding effective gluon emission vertex in heavy-ion collisions [1,2]. We also show that propagators in the gravitational shockwave background are double copies of the corresponding propagators in the gluon shockwave background [3]. We present the gravitational BFKL equation and comment upon its solution and similarities to the QCD case [4]. The existence of these double-copy relations suggest that CGC-based techniques that describe the energy evolution of gluon radiation in QCD can similarly be applied to study the gravitational wave radiation spectrum in the context of trans-Planckian scattering.