Originally Posted by

**UKSmartypants**
No it isnt. The mass of an electron is 9.10938356 × 10^{-31} kilograms. It was that before we ever worked it out, at the moment Cosmic Inflation ceased. Its an absolutel universal truth, dependant on nothing. There are 31 universal constants in Particle Physics that ar eabsolte , determined by nothing erlse, and cannot be calculated. They just are , and have alwys been, even if we had never discovered them. They include the strong nuclear force, the weak nuyclear force, the stength of gravity (G) the rate of elastic scattering, the close packing constant.the speed of light c, the Planck constant h, the 9 Yukawa couplings for the quarks and leptons (equivalent to specifying the rest mass of these elementary particles), 2 parameters of the Higgs field potential, 4 parameters for the quark mixing matrix, 3 coupling constants for the gauge groups SU(3) × SU(2) × U(1) (or equivalently, two coupling constants and the Weinberg angle).

Similarly in maths, there many absolute constants, that are not determined by obsevers: eg Pi *π*, Archimedes' constant π, The imaginary unit i, Euler's number e, Pythagoras' constant √2, The Feigenbaum constants α and δ, Apéry's constant ζ The golden ratio φ, The Euler–Mascheroni constant γ, Conway's constant λ, Khinchin's constant K, The Glaisher–Kinkelin constant A etc etc.

The truths in maths existed the moment the universe was created, the proof is that if they wernt, the unverse couldnt have existed. Consider the masses of the neutron, the proton, and helium. As it is, the neutron is heavier than the proton (by enough), so free neutrons decay into protons. However, helium is lighter than the protons and electrons it would turn into. Therefore, we get a universe like what we have: protons are stable, and so is helium, and we get stars, galaxies and elements up to 92 naturally.

Now: if the neutron was a bit heavier, then helium wouldn’t be stable (nor other atomic nuclei, other than hydrogen). This would mean that we would get a universe with only hydrogen, no other elements, no stars, and no interesting chemistry, which we could plausibly take to indicate no life. Conversely, if the neutron were (sufficiently) lighter than the proton, then protons decay to neutrons, and we get a similar deal - all neutrons, so no chemistry and thus (arguably) no life.