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Three-dimensional Particle Tracking Velocimetry for Turbulence Applications: Case of a Jet Flow

Three-dimensional Particle Tracking Velocimetry for Turbulence Applications: Case of a Jet Flow

Published on: February 27, 2016

Turbulent black holes.

Huan Yang^1,2, Aaron Zimmerman³, Luis Lehner¹

¹Perimeter Institute for Theoretical Physics, Waterloo, Ontario N2L2Y5, Canada.

Physical Review Letters

|March 14, 2015

Summary

This summary is machine-generated.

Rapidly spinning black holes exhibit a novel turbulence-like instability above a perturbation threshold. This phenomenon, with observable consequences for black hole binaries, offers insights into fluid dynamics via gravitational descriptions.

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Area of Science:

Astrophysics
Fluid Dynamics
General Relativity

Background:

Black holes are complex astrophysical objects governed by Einstein's theory of general relativity.
Understanding the dynamics of rapidly spinning black holes is crucial for astrophysical observations.
Turbulence is a complex phenomenon observed in various fluid systems, but its presence in astrophysical contexts like black holes is less understood.

Purpose of the Study:

To investigate the possibility of nonlinear parametric instabilities in rapidly spinning black holes.
To explore the connection between black hole dynamics and fluid turbulence.
To identify potential observable signatures of these instabilities in astrophysical systems.

Main Methods:

Simulating the behavior of rapidly spinning black holes under perturbation.
Analyzing the frequency transfer characteristics of the instability.
Applying fluid-gravity duality to connect gravitational phenomena with fluid dynamics.

Main Results:

Demonstrated a new nonlinear parametric instability in rapidly spinning black holes, triggered above a perturbation amplitude threshold.
Observed the transfer of energy from higher to lower temporal and azimuthal frequencies, akin to an inverse cascade in (2+1)-dimensional fluids.
Provided evidence for transitory turbulence in astrophysical black holes.

Conclusions:

The identified instability in spinning black holes suggests a connection to turbulence, with potentially observable consequences.
This finding predicts observable signatures in black hole binaries with high spins.
The gravitational description of this behavior, via fluid-gravity duality, may illuminate the study of turbulence in fluids.