Preserving the Sun from the Cold by a Perfectly Reflecting Dyson Sphere

TL;DR

Enclosing the sun in a perfectly reflecting sphere can paradoxically extend its lifespan by reducing its core temperature, leveraging the negative specific heat of gravitating systems, which is a novel theoretical insight.

Contribution

This paper introduces a theoretical model showing that a perfectly reflecting sphere around the sun can prolong its life, a counterintuitive result based on gravitational thermodynamics.

Findings

A perfectly reflecting sphere can increase the sun's lifetime.

The sun's lifetime grows exponentially with the cube root of the sphere's radius.

Negative specific heat effects lead to a decrease in core temperature.

Abstract

Some entities, such as humans, survive longest if their environment is neither too hot nor too cold, and the sun is no exception. It is rather obvious that if the sun were enclosed inside a thermally conducting sphere surrounded by a heat bath kept much hotter than the present central temperature of the sun, its nuclear burning would occur faster, so that the sun would last for a shorter time. It is less obvious that if the sun were surrounded by a perfectly reflecting sphere to prevent its radiation from escaping to cold empty space, it could actually last longer. Here I shall show that this is the case for such a sphere at least somewhat larger than the present solar radius. This naively paradoxical result is a consequence of the negative specific heat of many gravitating systems, so as the energy emitted by the sun is reflected back to increase the thermal energy, the sun expands and its central temperature goes down rather than up and reduces the nuclear burning rate, so that the sun can last much longer than five billion years, for a lifetime growing roughly exponentially with the cube root of the radius of the perfectly reflecting sphere.