J 2021

Geodesic structure of the accelerated stephani universe

BORMOTOVA, Iryna, Olena KOPTĚVA and Zdeněk STUCHLÍK

Basic information

Original name

Geodesic structure of the accelerated stephani universe

Authors

BORMOTOVA, Iryna (804 Ukraine, belonging to the institution), Olena KOPTĚVA (804 Ukraine, belonging to the institution) and Zdeněk STUCHLÍK (203 Czech Republic, belonging to the institution)

Edition

Symmetry, 2021, 2073-8994

Other information

Language

English

Type of outcome

Článek v odborném periodiku

Field of Study

10308 Astronomy

Country of publisher

Switzerland

Confidentiality degree

není předmětem státního či obchodního tajemství

References:

RIV identification code

RIV/47813059:19630/21:A0000157

Organization unit

Institute of physics in Opava

UT WoS

000665927500001

Keywords in English

inhomogeneous cosmology;spherical symmetry;Stephani solution;accelerated expansion;geodesic equations

Tags

Tags

International impact, Reviewed
Změněno: 23/2/2022 14:14, Mgr. Pavlína Jalůvková

Abstract

V originále

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.