The Big Bang & Variable Light Speed

[BURT]

[...]

Just a hint, when he does not understand some first year explanation, it
is a waste of time to try to explain him the stuff again using other
arguments because then he will be more confused (in some exponential way)
until a point where you will be unable to correct his unending mistakes.

Sorry champ, this isn't one of those times when you can gloat over me saying
something stupid.
Find something else to soothe your perpetually bruised ego.

You can flow behind light. You can move ahead of it. Light is a
constant only in space.

Mitch Raemsch

[Jenny]

a(t) is adimensional, whereas c(t) is a variable speed of light with units
of speed.

Since c(t) = 1/a(t), this is a silly claim.

ONCE AGAIN..

In natural units, c(t) replaces 1/a(t) and both are dimensionless -
and speeed is dimensionless in natural unit. So c(t) has dimensions of
speed.

In standard units, c(t) replaces c/a(t) and both c(t) and c/a(t)are in
units of LT^-1 - which are the dimensions of speed in standard
units.So once again, c(t) has dimensions of speed.

How many more times will you have to be told?

Bedrock knows that, Jenny knows that, moderator knows that, Carlip knows
that, everyone with a half brain knows that. The only idiot who continue
saying that c(t) and a(t) are the same thing... is you

They represent the same thing. Why is this even an issue?

Because they represent DIFFERENT things. a(t) represents a parameter
for an expanding world in which c is a constant. c(t) represents the
speed of light in a world in which c is a variable.

If AS YOU CLAIM this is not GR, then a(t) and c(t) aren't even in the
same THEORY, much less can they represent the same thing.

That's like claiming that "t" in Newtonian mechanics (where it
represents absolute time) is the same as "t" in relativity (where it
represents a frame dependent coordinate).

"t" and "t" are SPELT the same way, but CONCEPTUALLY they represent
VERY DIFFERENT things.

If you can't understand these very simple points, it's no wonder that
you're afraid of/weren't allowed into grad school.

Love,
Jenny