On 19-7-2010 21:38, Warp wrote:
> andrel <byt### [at] gmailcom> wrote:
>> On 19-7-2010 13:52, Warp wrote:
>>> andrel <byt### [at] gmailcom> wrote:
>>>> Big Bang theory says that at the moment of the Big Bang, time was 
>>>> created.
>>>   Are you sure about that? The Big Bang theory cannot go back to the
>>> initial singularity because there are no established theories which could
>>> be used to describe what happened when the universe was smaller than a
>>> certain (larger-than-zero) size. As wikipedia puts it: "there is no physical
>>> model that can explain the earliest moments of the universe's existence
>>> (Planck time) because of a lack of a consistent theory of quantum gravity."
>>>
>>>   There's thus a finite limit beyond which current theories cannot go
>>> because of lacking theories. Hence it's impossible to say what exactly
>>> happened before that.
> 
>> I fail to see how that is incompatible with what I said.
> 
>   If there's no physical model that can explain the earliest moments of the
> universe, how can you say that "at the moment of the Big Bang, time was
> created"? Exactly on which physical model is this claim based on? Or is it
> simply a conjecture?

No time without space, before the big bang no space -> no time.

That we have currently no theory that describes what happen at 
ridiculous energy levels does in no way imply that there is no 
description possible. Or in other words, we don't know what happened, 
only that something happened at those early times just after the big 
bang. As such it has no implications on what happened before t=0.

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