Year: 2020
Type: article
Abstract: We investigate the physics of black hole formation from the head-on collisions of boosted equal mass Oscillatons (OS) in full numerical relativity, for both the cases where the OS have equal phases or are maximally off-phase (anti-phase). While unboosted OS collisions will form a BH as long as their initial compactness ≡ GM / R is above a numerically determined critical value >0.035, we find that imparting a small initial boost counter-intuitively prevents the formation of black holes even if > 0.035. If the boost is further increased, at very high boosts γ>1/12 , BH formation occurs as predicted by the hoop conjecture. These two limits combine to form a "stability band" where collisions result in either the OS "passing through" (equal phase) or "bouncing back" (anti-phase), with a critical point occurring around ≈ 0.07. We argue that the existence of this stability band can be explained by the competition between the free fall and the interaction timescales of the collision.
Authors: James Y. Widdicombe, Thomas Helfer, Eugene A. Lim
Institutions: King's College London, Johns Hopkins University
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: bronze
Awards: G1259507762, G1541806023, Physics and Astrophysics of Compact Binaries, G165597396, G1736745720, G1771230537, G2073976794, G2111538794, G2240879383, G2264732632, G2840404975, G3205860120, G3531124447, G3563244976, G3718830055, G4279068983, G4490303832, G5562923697, G5660267321, G5768834005, G588734541, G6181174915, G6537386148, G6754173402, G6802598382, G6926846737, G7108246583, G7521014512, G7573294876, Strong Gravity and High-Energy Physics, Collaborative Research: Understanding Compact Binary Star Formation with the First Gravitational Wave Detections, G7937591081, G8050714359, TESTING THE FOUNDATIONS OF COSMOLOGY, G8710138095, G8710606730, G878803593
OpenAlex ID: W2977320513