Can a particle have a speed exceeding that of a photon in vacuum?
27098
Tachyons and Photons
105194
Quantum properties of objects with zero velocity
69107
Is it possible to combine two photons of different energies to get a single photon of a higher (combined) energy?
88637
Why can a particle decay into two photons but not one?
37941
Can light travel slower than the maximum?
14615
Can electricity flow through vacuum?
18799
If I run along the aisle of a bus traveling at (almost) the speed of light, can I travel faster than the speed of light?
32832
How do electromagnetic waves travel in a vacuum?
98389
Electromagnetic waves in vacuum
66987
Positron-electron annihilation - can more than two photons be created?
25121
Is it really possible to break the speed of light by flicking your wrist with a laser pointer?
56031
Quantum entanglement faster than speed of light?
56005
Speed of light travel
136086
Can light be trapped theoretically?
14922
Do tachyons move faster than light?
41041
Does a photon instantaneously gain $c$ speed when emitted from an electron?
101152
Can vacuum fluctuations change the position of an electron?