Graviton time delay and a speed limit for small black holes in Einstein-Gauss-Bonnet theory
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Camanho, Edelstein, Maldacena and Zhiboedov have shown that gravitons can
experience a negative Shapiro time delay, i.e. a time advance, in
Einstein-Gauss-Bonnet theory. They studied gravitons propagating in singular
"shock-wave" geometries. We study this effect for gravitons propagating in
smooth black hole spacetimes. For a small enough black hole, we find that
gravitons of appropriate polarisation, and small impact parameter, can
experience time advance. Such gravitons can also exhibit a deflection angle
less than
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1029-8479
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Science and Technology Facilities Council (ST/L000636/1)
Science and Technology Facilities Council (ST/J005673/1)