| LDR | ·····naa##22·····5##4500 |
| 001 | 001747 |
| 005 | 20210930122305.0 |
| 008 | 201016s2020###########f#####||||#0#und#d |
| 245 | 10 | $a Relativistic rigid systems and the cosmic expansion / $c Luciano Combi, Gustavo Romero. |
| 490 | 0# | $a Trabajos publicados del IAR ; $v no. 1568 |
| 520 | ## | $a We analyze the necessary conditir a body to remain rigid in an expanding cding cosmological Universe. First, we establish the main theorems and definitions for having a rigid body in a general spacetime as well as the new concept of quasilocal rigidity. We apply the obtained results to a homogeneous universe exploring the differences with flat spacetime. We discuss how the concept of rigid body helps to understand the expansion of space in cosmology. Finally, using a rigid system as a reference frame, we calculate the gravitational energy, and we compare it with previous results in the literature. |
| 773 | 0# | $7 ||as $t General Relativity and Gravitation $x 0001-7701 $g Vol. 52, (2020), p. 93 |
| 700 | 1# | $a Combi, Luciano. |
| 700 | 1# | $a Romero, G. E. $q (Gustavo Esteban) |
| 653 | ## | $a Cosmology. |
| 653 | ## | $a Rigidity. |
| 653 | ## | $a Expansion. |
| 653 | ## | $a Gravitational energy. |
| 653 | ## | $a General Relativity. |
| 653 | ## | $a Quantum Cosmology. |
| 040 | ## | $a AR-BaBIR $b spa |
| 856 | 41 | $u https://ui.adsabs.harvard.edu/abs/2020GReGr..52...93C $y ADS |
| 856 | ## | $u https://www.iar.unlp.edu.ar/biblio/htdocs/artic/contri/1568.pdf $y PDF |