Changes

:::::::*Or maybe photons change speed as they travel through space.

:::::::*Or maybe photons change speed as they travel through space.

:::::::*If the quantity in Broglie's formula is actually always the numeric value <math>E = 3\times10^8 p\,</math>, rather than the speed of light in the epoch in which it is being measured, Broglie's formula isn't correct except in the current epoch.

:::::::*If the quantity in de Broglie's formula is actually always the numeric value <math>E = 3\times10^8 p\,</math>, rather than the speed of light in the epoch in which it is being measured, de Broglie's formula isn't correct except in the current epoch.

:::::::*But if the quantity in Broglie's formula is always the speed of light wherever the measurements are made, then photons change energy, or momentum, as they travel through space.  This would violate the principles of conservation of energy or of momentum.

:::::::*But if the quantity in de Broglie's formula is always the speed of light wherever the measurements are made, then photons change energy, or momentum, as they travel through space.  This would violate the principles of conservation of energy or of momentum.

:::::::I really don't know which possibilities you have in mind.  I admit that I haven't pondered these possibilities, and I'm not aware that anyone else has either.

:::::::I really don't know which possibilities you have in mind.  I admit that I haven't pondered these possibilities, and I'm not aware that anyone else has either.

:::::::[[User:SamHB|SamHB]] ([[User talk:SamHB|talk]]) 20:53, 24 February 2016 (EST)

:::::::[[User:SamHB|SamHB]] ([[User talk:SamHB|talk]]) 20:53, 24 February 2016 (EST)