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Dynamics and Observational Signatures of Shell-like Black Hole Mimickers
Ulf Danielsson, Luis Lehner, Frans Pretorius
We undertake the task of studying the non-linear dynamics of quantum gravity motivated alternatives to black holes that in the classical limit appear as ultra-compact shells of mat…
Dynamical attractors in contracting spacetimes dominated by kinetically coupled scalar fields
Anna Ijjas, Frans Pretorius, Paul J. Steinhardt +1
We present non-perturbative numerical relativity simulations of slowly contracting spacetimes in which the scalar field driving slow contraction is coupled to a second scalar field…
Projecting the likely importance of weak-interaction-driven bulk viscosity in neutron star mergers
Elias R. Most, Steven P. Harris, Christopher Plumberg +6
In this work, we estimate how much bulk viscosity driven by Urca processes is likely to affect the gravitational wave signal of a neutron star coalescence. In the late inspiral, we…
The Effects of Multiple Modes and Reduced Symmetry on the Rapidity and Robustness of Slow Contraction
Anna Ijjas, Frans Pretorius, Paul J. Steinhardt +1
We demonstrate that the rapidity and robustness of slow contraction in homogenizing and flattening the universe found in simulations in which the initial conditions were restricted…
A numerical exploration of first-order relativistic hydrodynamics
Alex Pandya, Frans Pretorius
We present the first numerical solutions of the causal, stable relativistic Navier-Stokes equations as formulated by Bemfica, Disconzi, Noronha, and Kovtun (BDNK). For this initial…
Ultralocality and Slow Contraction
Anna Ijjas, Andrew P. Sullivan, Frans Pretorius +2
We study the detailed process by which slow contraction smooths and flattens the universe using an improved numerical relativity code that accepts initial conditions with non-pertu…