Symmetries and charges of general relativity at null boundaries
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DOI: 10.1007/jhep11(2018)125
Abstract: A bstractWe study general relativity at a null boundary using the covariant phase space formalism. We define a covariant phase space and compute the algebra of symmetries at the null boundary by considering the boundary-preserving… read more here.
Keywords: algebra; relativity null; general relativity; null boundaries ... See more keywords
Complex null geodesics in the extended Schwarzschild universe
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DOI: 10.1007/s10714-018-2407-z
Abstract: The generic null geodesic of the Schwarzschild–Kruskal–Szekeres geometry has a natural complexification, an elliptic curve with a cusp at the singularity. To realize that complexification as a Riemann surface without a cusp, and also to… read more here.
Keywords: schwarzschild universe; extended schwarzschild; null geodesics; geodesics extended ... See more keywords
Near-null interferometry using an aspheric null lens generating a broad range of variable spherical aberration for flexible test of aspheres.
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DOI: 10.1364/oe.26.031172
Abstract: A null lens moving back and forth relative to a point source can generate variable spherical aberration for flexible test of aspheres. Different from the previous methods, variable spherical aberration null theory was developed by… read more here.
Keywords: test; variable spherical; spherical aberration; near null ... See more keywords