Can biophysics tell us something about the weak equivalence principle vis a vis the thought experiment of Einstein involving human subjects?

TL;DR

This paper explores whether the phenomenon of light flashes experienced by astronauts can be used to test the weak equivalence principle, using the retina as a quantum measurement device in a novel experimental approach.

Contribution

It proposes a new method to investigate the weak equivalence principle through astronaut visual phenomena, linking biophysics with fundamental physics testing.

Findings

Astronauts experience light flashes caused by cosmic rays.

The retina may serve as a quantum measurement device.

Potential for new tests of the weak equivalence principle.

Abstract

Over a period of several decades it has been noticed that most astronauts, either orbiting the earth or on trips to the moon, have observed phosphenes or light flashes (LF) including streaks, spots and clouds of light when their eyes are closed or they are in a darkened cabin. Scientists suspect that two separate components of cosmic rays cause these flashes due to direct interaction with the retina. This phenomenon is not noticed on the ground because of cosmic ray interaction with the atmosphere. The argument is advanced that this effect may provide us with a new method of exploring the weak equivalence principle from the standpoint of Einstein's original thought experiment involving human subjects. This can be done, utilizing the retina only, as an animate quantum mechanical measuring device or, in conjunction with the Anomalous Long Term Effects on Astronauts (ALTEA) facility.