Propagation of light in low pressure gas

TL;DR

This paper discusses how coherent radiative processes like superradiance and multiphoton effects in low-pressure gases influence astrophysical phenomena, challenging traditional quantum electrodynamics views and explaining observed anomalies without invoking new physics.

Contribution

It introduces a model emphasizing coherence and superradiance in low-pressure gases, providing new explanations for astrophysical observations and critiquing simplified quantum electrodynamics.

Findings

Superradiance occurs in astrophysical plasma shells.

Spectral radiance of novae can reach laser-like levels.

Microwave blueshift explains Pioneer anomaly.

Abstract

The criticism by W. E. Lamb, W. Schleich, M. Scully, C. Townes of a simplified quantum electrodynamics which represents the photon as a true particle is illustrated. Collisions being absent in low-pressure gas, exchanges of energy are radiative and coherent. Thin shells of plasma containing atoms in a model introduced by Str\"omgren are superradiant, seen as circles possibly dotted. Spectral radiance of novae has magnitude of laser radiance, and column densities are large in nebulae: Superradiance, multiphoton effects, etc., work in astrophysics. The superradiant beams induce multiphotonic scatterings of light emitted by the stars, brightening the limbs of plasma bubbles and darkening the stars. In excited atomic hydrogen, impulsive Raman scatterings shift frequencies of light. Microwaves exchanged with the Pioneer probes are blueshifted, simulating anomalous accelerations. Substituting coherence for wrong calculations in astrophysical papers, improves results, avoids "new physics".