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Causality Relations At Infinity

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If you have a question about this talk, please contact Nathan Johnson-McDaniel.

Motivated by an attempt to construct a theory of quantum gravity as perturbations around some flat background, Penrose has shown that despite being asymptotically flat, there is an inconsistency between the causal structure at infinity of Schwarzschild and Minkowski spacetimes. This suggests that such a perturbative approach cannot possibly work. However, the proof of this inconsistency is specific to 4 spacetime dimensions. In this talk I will discuss how this result extends to higher (and lower) dimensions. More generally, I will consider examples of how the causality properties of asymptotically flat spacetimes are affected by dimension and by the presence of mass (both positive and negative).

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

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