Could the antimatter from the Big Bang have gone in the opposite direction in time?
61618
Could the missing antimatter lie outside the observable universe?
58503
Electrons moving faster than light and backward in time?
75939
Can matter really fall through an event horizon?
72773
Is Bohmian mechanics really incompatible with relativity?
56776
How close does a particle-antiparticle pair need to be for annihilation to happen?
13662
Did time exist before the Big Bang and the creation of the universe?
13269
How would we tell antimatter galaxies apart?
155552
Is it possible for a system to have negative potential energy?
51026
Time dilation all messed up!
126980
What happens at the interface between two universes with opposite thermodynamic arrows of time?
100690
Does superluminal travel imply travelling back in time?
91265
Has the speed of light changed over time?
149215
Does a particle annihilate only with its antiparticle? If yes, why?
22090
Does the (relativistic) mass change? Why?
52248
Why does the direction of a dipole moment go from negative to positive charge?
35463
How come the universe is made of matter and not antimatter?
4087
Did spacetime start with the Big bang?