The paper constructs additive Lorentzian angles for null vectors and proves a simplicial Lorentzian Gauss-Bonnet theorem.
Is the gravitational action additive?
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abstract
The gravitational action is not always additive in the usual sense. We provide a general prescription for the change in action that results when different portions of the boundary of a spacetime are topologically identified. We discuss possible implications for the superposition law of quantum gravity. We present a definition of `generalized additivity' which does hold for arbitrary spacetime composition.
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2019 1verdicts
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Lorentzian angles and trigonometry including lightlike vectors
The paper constructs additive Lorentzian angles for null vectors and proves a simplicial Lorentzian Gauss-Bonnet theorem.