Variable Speed of Light

Abstract

The Variable Speed of Light (VSL) theory challenges the postulate of an invariant propagation speed by proposing that the speed of energy transfer varies within gravitational contexts. This paper reviews the foundational tenets of VSL, its incorporation of Mach’s principle, and its implications for interpreting cosmological redshift outside of traditional general relativity.

Introduction

The VSL theory emerged as a response to the desire for alternative explanations to observed cosmological phenomena, challenging the framework of general relativity. By allowing for the variability of the speed of light, the VSL theory presents a radical departure from established principles of modern physics.

Basic Tenets

Variability of the Speed of Light: In the VSL theory, the speed of light is not held constant but can vary depending on the gravitational environment, offering a departure from the fundamental postulate of Einstein’s special theory of relativity.

Incorporation of Mach’s Principle: Dicke’s theory incorporates Mach’s principle, suggesting a connection between the distribution of matter in the universe and the properties of spacetime, providing a theoretical framework for understanding the variability of the speed of light.

Redshift Interpretation: The VSL theory offers an alternative interpretation of cosmological redshift, attributing it to changes in the speed of light over time rather than the expansion of the universe, challenging the prevailing cosmological paradigm.

Strengths

Exploration of Alternative Cosmological Models: The VSL theory has spurred exploration into alternative cosmological models that depart from the framework of general relativity, fostering new avenues for theoretical investigation and cosmological inquiry.

Linkage to Fundamental Constants: Some models linking VSL theories to Dirac’s Large Numbers Hypothesis suggest a potential connection between fundamental constants and the size and age of the universe, stimulating further research into the underlying principles of cosmology and fundamental physics.

Weaknesses

Incompatibility with General Relativity: The VSL theory represents a departure from general relativity, raising questions about its consistency with established experimental evidence and observational constraints.