Dynamical particles in spatially flat FLRW space-times
Abstract 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 t...
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| Format: | Article |
| Language: | English |
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SpringerOpen
2022-01-01
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| Series: | European Physical Journal C: Particles and Fields |
| Online Access: | https://doi.org/10.1140/epjc/s10052-022-10023-7 |
| _version_ | 1818306441395568640 |
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| author | Ion I. Cotăescu |
| author_facet | Ion I. Cotăescu |
| author_sort | Ion I. Cotăescu |
| collection | DOAJ |
| description | Abstract 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. |
| first_indexed | 2024-12-13T06:42:32Z |
| format | Article |
| id | doaj.art-78a1262cfe744ab9b8b7d44c86a36de2 |
| institution | Directory Open Access Journal |
| issn | 1434-6044 1434-6052 |
| language | English |
| last_indexed | 2024-12-13T06:42:32Z |
| publishDate | 2022-01-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | European Physical Journal C: Particles and Fields |
| spelling | doaj.art-78a1262cfe744ab9b8b7d44c86a36de22022-12-21T23:56:23ZengSpringerOpenEuropean Physical Journal C: Particles and Fields1434-60441434-60522022-01-018211910.1140/epjc/s10052-022-10023-7Dynamical particles in spatially flat FLRW space-timesIon I. Cotăescu0West University of TimişoaraAbstract 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.https://doi.org/10.1140/epjc/s10052-022-10023-7 |
| spellingShingle | Ion I. Cotăescu Dynamical particles in spatially flat FLRW space-times European Physical Journal C: Particles and Fields |
| title | Dynamical particles in spatially flat FLRW space-times |
| title_full | Dynamical particles in spatially flat FLRW space-times |
| title_fullStr | Dynamical particles in spatially flat FLRW space-times |
| title_full_unstemmed | Dynamical particles in spatially flat FLRW space-times |
| title_short | Dynamical particles in spatially flat FLRW space-times |
| title_sort | dynamical particles in spatially flat flrw space times |
| url | https://doi.org/10.1140/epjc/s10052-022-10023-7 |
| work_keys_str_mv | AT ionicotaescu dynamicalparticlesinspatiallyflatflrwspacetimes |