The tail effect as a window on the self-force problem and the propagation of scalar and electromagnetic waves in curved spacetime.

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• Klaountia Pasmatsiou (Case Western Reserve University)
• Friday 19 February 2021, 13:00-14:00
• Zoom.

If you have a question about this talk, please contact Chandrima Ganguly.

Scalar, electromagnetic and linear gravitational radiation do not solely propagate on the null cone in 3+1 dimensions in curved spacetimes, contrary to their well-known behavior in flat spacetime. Their additional propagation inside the null cone is known as the tail effect. In the first part of the talk, I will present new results for the tail-induced electromagnetic and gravitational self-force for a test particle in orbit around a central body. This test particle will produce a signal whose tail will interact with its future worldline, thus producing a tail-induced self-force. I will show that the self force can serve as a probe of the internal structure of the central object, with possible future implications for neutron star-black hole mergers. During the second part of the talk, I will present new results on the propagation of the ” tail radiation” resulting from inhomogeneities in curved spacetime. If observable, tail radiation has the potential to become a new window in the universe and my interest is its application on astrophysical systems, hence offering complementary information beyond the usual lensing studies in GR.

This talk is part of the DAMTP Friday GR Seminar series.

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