If t =0 then where is negative time?

>>>If t =0 then where is negative time?

<<< back there?

bob(from black rock) said:

>>>If t =0 then where is negative time?

<<< back there?

T=0 is by definition the beginning.

bob(from black rock) said:

>>>If t =0 then where is negative time?

<<< back there?

I think so.

T=0 is by definition the beginning.

——

Only by the religious.

brett said:

If t =0 then where is negative time?

Before the launch

T= -20… -10, 9,8,7…

T=0 at the BB and advanced from there with expansion of space.
But in reality it should be said, it was from T=0 and space expansion with the BB, just space and time, as we know them.

Before that probably existed space and time at a level not described by current models and theories.

If you are referring to the beginning of time it gets confusing.

There is currently no widely accepted framework for how to combine quantum mechanics with relativistic gravity and (t=0 to 10^-43^ seconds). Science is not currently able to make predictions about events occurring over intervals shorter than the Planck time or distances shorter than one Planck length.

How do you measure time in the very early universe anyway?

“There is a lot of fluff written about quantities with the word Planck in front of them, but (as yet) they are really a sign where something has gone wrong. We know that at and before the Planck time our knowledge of the laws of physics fails. At this earliest epoch of the universe, both quantum mechanics and general relativity influence all of the processing going on, and we need them to work together, and what we know is that they simply don’t.”

The graph in this Cusp blog illustrates the problem nicely.

http://cosmic-horizons.blogspot.com.au/2012/04/drawing-line.html

should be…

There is currently no widely accepted framework for how to combine quantum mechanics with relativistic gravity.. during the Planck epoch (t=0 to 10^-43^ seconds).

The time interval and space interval to which Ian is referring is known as a singularity, or where all our known models break down.

T minus 15 seconds and counting

Thanks Ian for the Cusp link.

He is helpful, in simple language, for complex questions.

I think he has developed a good sense of humour as he ages and is not grumpy at all.:)

The Lufkin Pro can measure infinity, well almost.

See if you can get it to reflect back from the moon.