Abstract
The conventional gravitational memory effect is a relative displacement in the position of two detectors induced by radiative energy flux. We find a new type of gravitational ‘spin memory’ in which beams on clockwise and counterclockwise orbits acquire a relative delay induced by radiative angular momentum flux. It has recently been shown that the displacement memory formula is a Fourier transform in time of Weinberg’s soft graviton theorem. Here we see that the spin memory formula is a Fourier transform in time of the recently-discovered subleading soft graviton theorem.
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Pasterski, S., Strominger, A. & Zhiboedov, A. New gravitational memories. J. High Energ. Phys. 2016, 53 (2016). https://doi.org/10.1007/JHEP12(2016)053
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DOI: https://doi.org/10.1007/JHEP12(2016)053