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- W2891364359 abstract "The effects on Raychaudhuri's equation of an intrinsically-discrete or particle nature of spacetime are investigated. This is done through the consideration of null congruences emerging from, or converging to, a generic point of spacetime, i.e. in geometric circumstances somehow prototypical of singularity issues. We do this from an effective point of view, that is through a (continuous) description of spacetime modified to embody the existence of an intrinsic discreteness on the small scale, this adding to previous results for non-null congruences. Various expressions for the effective rate of change of expansion are derived. They in particular provide finite values for the limiting effective expansion and its rate of variation when approaching the focal point. Further, this results in a non-vanishing of the limiting cross-sectional area itself of the congruence." @default.
- W2891364359 created "2018-09-27" @default.
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- W2891364359 date "2018-10-23" @default.
- W2891364359 modified "2023-10-16" @default.
- W2891364359 title "Effective Null Raychaudhuri Equation" @default.
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- W2891364359 doi "https://doi.org/10.3390/particles1010017" @default.
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