This is a genuine question on my part – and I would be grateful for any answers!
The inspiration for asking the question comes from Genius: Richard Feynman and Modern Physics – my current “listen while running” book – along with Feynman’s own description of radiation in QED – The Strange Theory of Light and Matter.
Feynman argues that there is no radiation without absorption: in other words a tree that falls in an empty forest does indeed make no sound (if we imagine the sound is transmitted by photons, that is).
This sounds like a gross violation of all common sense – how could a photon know when it leaves a radiating body that it is to be absorbed?
But how can a body that exists for no time at all, exist at all?
Then again my assumption in asking this question is that time is in some sense privileged as a dimension of spacetime. This is a pretty deep controversy in theoretical physics these days and I am not qualified to shed much light on it – but let us assume that a body can exist with a zero dimension in time but real dimensions in space, can we then have bodies which have zero dimensions in space but a real dimension in time? If so, what are they?
- Entangled toy universe shows time may be an illusion (newscientist.com)
- The Twists and Turns of Hi(gg)story (profmattstrassler.com)
- And Let There Be “Molecules” of Light (blogs.scientificamerican.com)
- New form of photon-based matter is essentially a lightsaber (geek.com)
- Scientists create never-before-seen form of matter (americankabuki.blogspot.com)
- Fascinating Friday – Feynman (thecomplainerscompendium.wordpress.com)