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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference

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Published on: September 5, 2019

Relativistic photon mediated shocks.

Amir Levinson¹, Omer Bromberg

¹Raymond and Beverly Sackler School of Physics and Astronomy, Tel Aviv University, Tel Aviv 69978, Israel.

Physical Review Letters

|June 4, 2008

Summary

This study models relativistic radiation-dominated shocks, finding photon distribution anisotropy increases with shock velocity. Solutions converge, showing improved accuracy with higher-order approximations for radiation hydrodynamics.

Area of Science:

Astrophysical hydrodynamics
Relativistic astrophysics
Radiation transfer

Background:

Understanding radiation-dominated shocks is crucial for astrophysical phenomena like supernovae and active galactic nuclei.
The photon distribution function and its anisotropy are key to modeling shock structure.

Purpose of the Study:

To derive and solve a system of equations for steady, relativistic radiation-dominated shocks.
To investigate the behavior of photon anisotropy within these shocks.
To analyze the convergence properties of the moment equations.

Main Methods:

Derivation of shock structure equations from the general transfer equation.
Closure of moment equations through truncation at a specific order.
Numerical solutions for various upstream conditions.

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Main Results:

Photon distribution anisotropy increases with shock velocity.
Near-perfect beaming is observed at high upstream Lorentz factors (Gamma(-)).
Solutions demonstrate convergence as the truncation order increases.

Conclusions:

The derived system of equations accurately models relativistic radiation-dominated shocks.
Photon anisotropy is a significant factor in shock structure, especially at high velocities.
Truncation of moment equations provides a viable method for obtaining accurate solutions.