13-18 December 2015
International Conference Centre Geneva
Europe/Zurich timezone

Modelling inhomogeneous cosmologies with Numerical Relativity

14 Dec 2015, 14:00
21m
Level 2, Room 13 (International Conference Centre Geneva)

Level 2, Room 13

International Conference Centre Geneva

17 Rue de Varembé, 1211 Geneva

Speaker

Dr Eloisa Bentivegna (Università degli Studi di Catania)

Description

Building accurate, multi-scale models of the Universe is a complex but necessary task in the era of precision cosmology, when observational data demands a thorough understanding of all effects which are expected to contribute at the 1% level, among which the full role of General Relativity. This task has recently been tackled with a variety of approaches, which range from the study of toy models [1], to analytical expansions [2] and hybrid analytical-numerical methods where relativistic effects are superimposed on classical, Newtonian N-body systems [3][4][5]. In this presentation, I will describe recent work carried out in Numerical Relativity to describe the relativistic Universe exactly, integrating Einstein’s equation in three dimensions. This approach is the only one that can account for the full extent of the theory, and has already yielded significant results in several scenarios, such as black-hole lattices [6] and scalar-field collapse in cosmological settings [7]. References: [1] Korzyński, M., “Nonlinear effects of general relativity from multiscale structure”, http://arxiv.org/abs/1412.3865 [2] Bruneton J.-P. and Larena, J., “Dynamics of a lattice Universe: The dust approximation in cosmology”, http://arxiv.org/abs/1204.3433 [3] Bruni, M., Thomas, D. and Wands, D., “Computing General Relativistic effects from Newtonian N-body simulations: Frame dragging in the post-Friedmann approach”, http://arxiv.org/abs/1306.1562 [4] Adamek, J. et al, “N-body methods for relativistic cosmology”, http://arxiv.org/abs/1408.3352 [5] Adamek, J. et al, “General relativity and cosmic structure formation”, http://arxiv.org/abs/1509.01699 [6] Bentivegna, E. and Korzynski, M., "Evolution of a periodic eight-black-hole lattice in numerical relativity”, http://arxiv.org/abs/1204.3568 [7] Torres, J. M. et al, “Cosmological nonlinear structure formation in full general relativity”, http://arxiv.org/abs/1409.7953

Primary author

Dr Eloisa Bentivegna (Università degli Studi di Catania)

Presentation Materials