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The Raychaudhuri Equation in inhomogeneous FLRW space-time : A $f(R)$-gravity model

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arxiv 2302.08782 v1 pith:AVTH67DK submitted 2023-02-17 gr-qc

classification gr-qc
keywords equationraychaudhuribeendescriptiondifferentialflrwformgeodesics
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abstract

In general description of the Raychaudhuri equation it is found that this first order non-linear differential equation can be written as a second order linear differential equation in the form of Harmonic Oscillator with varying frequency. Further, the integrability of the Raychaudhuri equation has been studied and also the expansion scalar is obtained in an explicit form. Subsequently, $f(R)$ gravity theory has been studied in the background of inhomogeneous FLRW spacetime with an aim to formulate the Raychaudhuri Equation. A congruence of time-like geodesics has been investigated using the Raychaudhuri Equation to examine whether the geodesics converge or not and some possible conditions are determined to avoid singularity. Finally, a brief quantum description has been presented.

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  1. Horizon-regular cross-focusing and inner-horizon obstructions in spherical f(R) gravity

    gr-qc 2026-08 accept novelty 6.0 of 10

    In spherical f(R) gravity, a regular outer horizon followed by an ingoing segment with mixed matter-scalaron source at or below F/r^2 cannot be followed by a second regular inner marginal horizon on the same generator.

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