I What formulas would apply during a Big Crunch

[KurtLudwig]

During a hypothesized big crunch, how quickly will a universe collapse? As the velocity approaches the speed of light, its mass will increase greatly. What equations will apply in such a collapse?
Kurt Ludwig

 

[Orodruin]

1. A Big Crunch is not compatible with our current knowledge of the content of the Universe.
2. It would not happen with ”a speed”, it would happen with a rate.
3. Mass does not increase with speed. Relativistic mass is an unnecessary concept.
4. A Big Crunch would be described by the exact same equations as the Big Bang, the Friedmann equations.

 

[KurtLudwig]

How is the rate calculated? The Friedmann equations are above my mathematical skill level. Is there a solution of the Friedmann equations that simplify the rate inflation/deflation calculations?
Kurt Ludwig