Geodesic structure of the accelerated stephani universe

@article{58625,
   author = {Bormotova, Iryna and Koptěva, Olena and Stuchlík, Zdeněk},
   article_number = {6},
   doi = {http://dx.doi.org/10.3390/sym13061001},
   keywords = {inhomogeneous cosmology;spherical symmetry;Stephani solution;accelerated expansion;geodesic equations},
   language = {eng},
   issn = {2073-8994},
   journal = {Symmetry},
   title = {Geodesic structure of the accelerated stephani universe},
   url = {https://www.mdpi.com/2073-8994/13/6/1001},
   volume = {13},
   year = {2021}
}

TY  - JOUR
ID  - 58625
AU  - Bormotova, Iryna - Koptěva, Olena - Stuchlík, Zdeněk
PY  - 2021
TI  - Geodesic structure of the accelerated stephani universe
JF  - Symmetry
VL  - 13
IS  - 6
SP  - "1001-1"-"1001-13"
EP  - "1001-1"-"1001-13"
SN  - 20738994
KW  - inhomogeneous cosmology;spherical symmetry;Stephani solution;accelerated expansion;geodesic equations
UR  - https://www.mdpi.com/2073-8994/13/6/1001
N2  - 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.
ER  - 

BORMOTOVA, Iryna, Olena KOPTĚVA and Zdeněk STUCHLÍK. Geodesic structure of the accelerated stephani universe. \textit{Symmetry}. 2021, vol.~13, No~6, p.~''1001-1''-''1001-13'', 13 pp. ISSN~2073-8994. Available from: https://dx.doi.org/10.3390/sym13061001.