Abstract
A Newtonian uniform ball expanding in empty space constitutes a common heuristic analogy for FLRW cosmology. We discuss possible implementations of the corresponding general-relativistic problem and a variety of new cosmological analogies arising from them. We highlight essential ingredients of the Newtonian analogy, including the fact that the Hawking-Hayward quasilocal mass that is always “Newtonian” in the sense that the magnetic part of the Weyl tensor does not contribute to it. A symmetry of the Einstein-Friedmann equations produces another one in the original Newtonian system.
- Received 18 June 2020
- Accepted 27 July 2020
DOI:https://doi.org/10.1103/PhysRevD.102.044020
© 2020 American Physical Society
Physics Subject Headings (PhySH)
Gravitation, Cosmology & Astrophysics