Geodesic Structure of the Accelerated Stephani Universe
For the spherically symmetric Stephani cosmological model with an accelerated expansion, we investigate the main scenarios of the test particle and photon motion. We show that a comoving observer sees an appropriate picture. In the case of purely radial motion, the radial velocity decreases slightly...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2021-06-01
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| Series: | Symmetry |
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| Online Access: | https://www.mdpi.com/2073-8994/13/6/1001 |
| _version_ | 1797531539790102528 |
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| author | Irina Bormotova Elena Kopteva Zdeněk Stuchlík |
| author_facet | Irina Bormotova Elena Kopteva Zdeněk Stuchlík |
| author_sort | Irina Bormotova |
| collection | DOAJ |
| description | For the spherically symmetric Stephani cosmological model with an accelerated expansion, we investigate the main scenarios of the test particle and photon motion. We show that a comoving observer sees an appropriate picture. In the case of purely radial motion, the radial velocity decreases slightly with time due to the universe expansion. Both particles and photons spiral out of the center when the radial coordinate is constant. In the case of the motion with arbitrary initial velocity, the observable radial distance to the test particle can increase under negative observable radial velocity. |
| first_indexed | 2024-03-10T10:45:12Z |
| format | Article |
| id | doaj.art-c12902e9fde143d4bf5a3da1ead39ca6 |
| institution | Directory Open Access Journal |
| issn | 2073-8994 |
| language | English |
| last_indexed | 2024-03-10T10:45:12Z |
| publishDate | 2021-06-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Symmetry |
| spelling | doaj.art-c12902e9fde143d4bf5a3da1ead39ca62023-11-21T22:41:12ZengMDPI AGSymmetry2073-89942021-06-01136100110.3390/sym13061001Geodesic Structure of the Accelerated Stephani UniverseIrina Bormotova0Elena Kopteva1Zdeněk Stuchlík2Research Centre for Theoretical Physics and Astrophysics, Institute of Physics, Silesian University in Opava, CZ-746 01 Opava, Czech RepublicResearch Centre for Theoretical Physics and Astrophysics, Institute of Physics, Silesian University in Opava, CZ-746 01 Opava, Czech RepublicResearch Centre for Theoretical Physics and Astrophysics, Institute of Physics, Silesian University in Opava, CZ-746 01 Opava, Czech RepublicFor the spherically symmetric Stephani cosmological model with an accelerated expansion, we investigate the main scenarios of the test particle and photon motion. We show that a comoving observer sees an appropriate picture. In the case of purely radial motion, the radial velocity decreases slightly with time due to the universe expansion. Both particles and photons spiral out of the center when the radial coordinate is constant. In the case of the motion with arbitrary initial velocity, the observable radial distance to the test particle can increase under negative observable radial velocity.https://www.mdpi.com/2073-8994/13/6/1001inhomogeneous cosmologyspherical symmetryStephani solutionaccelerated expansiongeodesic equations |
| spellingShingle | Irina Bormotova Elena Kopteva Zdeněk Stuchlík Geodesic Structure of the Accelerated Stephani Universe Symmetry inhomogeneous cosmology spherical symmetry Stephani solution accelerated expansion geodesic equations |
| title | Geodesic Structure of the Accelerated Stephani Universe |
| title_full | Geodesic Structure of the Accelerated Stephani Universe |
| title_fullStr | Geodesic Structure of the Accelerated Stephani Universe |
| title_full_unstemmed | Geodesic Structure of the Accelerated Stephani Universe |
| title_short | Geodesic Structure of the Accelerated Stephani Universe |
| title_sort | geodesic structure of the accelerated stephani universe |
| topic | inhomogeneous cosmology spherical symmetry Stephani solution accelerated expansion geodesic equations |
| url | https://www.mdpi.com/2073-8994/13/6/1001 |
| work_keys_str_mv | AT irinabormotova geodesicstructureoftheacceleratedstephaniuniverse AT elenakopteva geodesicstructureoftheacceleratedstephaniuniverse AT zdenekstuchlik geodesicstructureoftheacceleratedstephaniuniverse |