# Constraints on fundamental physical constants from bio-friendly viscosity and diffusion

## TL;DR

This paper explores how fundamental physical constants are constrained by bio-friendly viscosity and diffusion in biological systems, proposing a new perspective from condensed matter physics that links physical constants to life's essential processes.

## Contribution

It introduces the concept of bio-friendly windows for physical constants based on viscosity and diffusion, suggesting multiple tuning and evolutionary mechanisms without affecting nuclear synthesis.

## Key findings

- Bounds on viscosity and diffusion can vary independently of fundamental constants.
- Bio-friendly windows constrain physical constants relevant to biological processes.
- Proposes a new link between condensed matter physics and fundamental constants.

## Abstract

The problem of understanding fundamental physical constants was discussed in particle physics, astronomy and cosmology. Here, I show that a new insight comes from condensed matter physics and liquid physics in particular: fundamental constants have a bio-friendly window constrained by bio-friendly viscosity and diffusion setting the motion in essential life processes in and across cells. I also show that bounds on viscosity, diffusion and the fundamental velocity gradient in a biochemical machine can all be varied while keeping the fine-structure constant and the proton-to-electron mass ratio intact, with no implication for the production of heavy nuclei in stars. This leads to a conjecture of multiple tuning and an evolutionary mechanism.