[thedoc (OP)]

darren asked the Naked Scientists:
   
When the Big Bang happened, and the Universe was expanding, the impedance relates to the ratio of electric fields to magnetic fields in light; every light wave is made up of both kinds of field, and its measured value, along with the permittivity of space to magnetic fields, governs the speed of light.

Would you say the magnetic field when the universe just started was stronger making light move faster? Because as we know now  light does not run at a constant speed like we thought.

What do you think?

[Atomic-S]

What evidence supports the idea that the electromagnetic properties of the early universe were different than now?

[Atomic-S]

Another way of phrasing this question is whether the relation between space and time then was different than now, because according to Einstein:

     absolute separation between events = √[(Δx)² + (Δy)² + (Δz)² + (icΔt)²]

showing that is c is different, then the way space and time measure relative to each other is also different.

[jccc]

we are not in younger universe, all answers would be theory not fact.

my theory is if charges' force strength is the same, em force speed is the same, then light speed is the same.

as we know today, light speed, gravity speed and em force speed are the same. there must be a connection.

[Airthumbs]

Yesterday the Universe was younger and I am pretty sure light was moving at the same speed, not only yesterday but the day before that too.  []