Dynamical particles in spatially flat FLRW space-times
West University of Timişoara, V. Pârvan Ave. 4, 300223, Timişoara, Romania
Accepted: 12 January 2022
Published online: 28 January 2022
Metrics of dynamical point particles embedded in spatially flat FLRW space-times are derived as isotropic solutions of the Einstein equations with the energy–momentum tensor of a perfect fluid. These particles are produced by central singularities of the fluid density but without changing the pressure of the asymptotic FLRW space-times. It is shown that each particle gets a dynamical photon sphere before a critical instant when two dynamical apparent horizons arise just on the photon sphere evolving then as C-curves. The angular radius of the shadow associated to the photon sphere is derived and compared with the known results.
© The Author(s) 2022
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