期刊
JOURNAL OF HIGH ENERGY PHYSICS
卷 -, 期 11, 页码 -出版社
SPRINGER
DOI: 10.1007/JHEP11(2015)109
关键词
Classical Theories of Gravity; Black Holes
资金
- ERC grant [ERC-2011-StG 279363-HiDGR]
- STFC studentship
- Science and Technology Facilities Council [ST/L000636/1, ST/J005673/1, 1481097, ST/L000385/1] Funding Source: researchfish
- STFC [ST/J005673/1, ST/L000385/1, ST/L000636/1] Funding Source: UKRI
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 pi, characteristic of a repulsive short-distance gravitational interaction. We discuss problems with the suggestion that the time advance can be used to build a time machine. In particular, we argue that a small black hole cannot be boosted to a speed arbitrarily close to the speed of light, as would be required in such a construction.
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