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Originally Posted by dipayankar  That's good 'The ghost of the mass'. Another silly question, Why does not EM waves require medium to travel? if photon is energy and does not have mass, it should require a medium like ether to travel. But we know ether does not exist... |
Hi Dirayankar; One Einstein said it wasn't needed, later rethought his idea and concluded there was a form of ether, throughout space. Be it gravitational waves, electromagnetic fields, etc.
"We assume to find in every point of space a flow in all directions of radiant energy from all astrophysical objects, meaning that space everywhere has a specific energy
U [erg] and an energy density
u = U/V [erg/cm³], which of course is a local variable depending on the position in space".
"The radiant energy will we name the "Aether", and since it is present throughout the Universe, we will call space the "Aether-Space". Presuming the aether the medium sustaining all physical fields and forces, the aether-space is the
universal physical space".
Best to all, Pat P.S. Drifter my Bhagavad-Gita was published by The Bhaktivedanta Book Trust