| there are a couple definitions you would need to elaborate on to realise this question fully by particle physicists usually mean any electromagnetic phenomena that seems to have distinct energy levels and so can refer to any number of things depending on context: photons, electrons, protons, atoms(o) as for interact, what do you mean by this? would you consider entanglement an 'interaction'? the idea of a wavefunction is basically that every particle is 'interacting' with every other particle in existence in every direction with potential of collisions being discernible by the probabilities of the particle's position being spread out ad inifinitum according to relativity light has a constant speed, meaning it is always moving at 'c' since the photon is moving it has energy and though it has a 'rest' mass of 0 it is without a rest frame because it is always moving at that constant speed and so always has some measurable mass because of this even in a universe with only a single photon without anything to interact with the photon would still affect spacetime if you remove the 'only' from your question then the answer is an emphatic yes because you yourself are a collection of 'particles' 'interacting' and you are affecting spacetime (o) https://physics.stackexchange.com/questions/146975/is-a-phot... |
I meant pretty much anything that can be described by wave function evolving according to Schrodinger equation.
> as for interact, what do you mean by this?
Exchange of energy through any of 3 physical forces (not gravity). So not entanglement.
Single photon universe would never be observed so it would have wave function but never have specific location so according to my idea it would not affect spacetime.