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pixel01
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Can anyone tell me what the universe was before Bigbang?
Thanks
Thanks
pixel01 said:Can anyone tell me what the universe was before Bigbang?
Thanks
pixel01 said:Can anyone tell me what the universe was before Bigbang?
Thanks
pixel01 said:Can anyone tell me what the universe was before Bigbang?
Thanks
russ_watters said:No. You are confusing time with the units of time. A "day" is a human construct just like a "meter" is, but that doesn't mean that time and length do not exist.
You may be interested in this point of view beyond general relativity:mjsd said:Interesting... if spacetime itself is created at the big bang, then it is meaningless to talk about "before" because time did not exist before the big bang
In semipopular articles and radio shows, relativists now like to emphasize that the question “what was there before?” is rendered meaningless because the notions of ‘before’ and ‘after’ refer to a space-time geometry. We now have a new paradigm, a new dogma: In the Beginning there was the big bang.
But general relativity is incomplete. For, it ignores quantum effects entirely. Over the last century, we have learned that these effects become important in the physics of the small and should in fact dominate in parts of the universe where matter densities become enormous. So, there is no reason to trust the predictions of general relativity near spacetime singularities. The classical physics of general relativity does come to a halt at the big-bang. But applying general relativity near a singularities is an extrapolation which has no justification whatsoever. We need a theory that incorporates not only the dynamical nature of geometry but also the ramifications of quantum physics. Does the ‘correct’ or ‘true’ physics stop at the big-bang also in quantum gravity? Or, is there yet another paradigm shift waiting in the wings?
hellfire said:You may be interested in this point of view beyond general relativity:
The Issue of the Beginning in Quantum Gravity. A. Ashtekar
http://arxiv.org/physics/0605078
mjsd said:mm... this is the point of view of the gr-qc clan, I wonder what the hep-th and the string gang got to say about this?
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pixel01 said:Can anyone tell me what the universe was before Bigbang?
hayzie said:I still can't see how there was nothing before the big bang. i can't get my mind around the concept of time and distance not existing.
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marcus said:Why should you WANT to get your mind around that idea?
Please read the preceding posts #14 and #15. There is no scientific grounds for believing that time and space did not exist before the start of expansion.
At the present stage a lot of us need to get over the idea that was peddled in earlier decades (by prominent scientists!) that somehow Science tells us that there was nothing before the start of expansion.
Equally good models give different answers about that. Some cruise along smoothly back in time to before expansion started, and some break down.
There WILL be tests to try to exclude one or the other, based on what the predict about what we can observe at the present time.
But so far there is no empirical reason to prefer one or the other.
So there is no scientific grounds for saying that before a certain event there was nothing. It depends on which model.
So I'd say you need to clean your head out of the idea that anyone expects you to believe there was nothing before big bang. If they come at you with that tell them Science doesn't say that there was nothing.
that was a misconception that somehow became popular (may have had something to do with the attention-loving celebrity in the wheelchair )
That is under the assumption General Relativity holds all the way back to the predicted singularity.FeynmanMH42 said:an expanding universe would have had its beginnings in a Big Bang singularity thus giving space and time a beginning with no "before"?
EL said:That is under the assumption General Relativity holds all the way back to the predicted singularity.
But we know GR cannot do so since it isn't compatibel with quantum mechanics.
The Big Bang theory is a widely accepted scientific explanation for the origin and evolution of the universe. It proposes that the universe began as a singularity, a point of infinite density and temperature, approximately 13.8 billion years ago. This singularity expanded and cooled, eventually forming the universe as we know it today.
It is currently unknown what existed before the Big Bang as the laws of physics as we know them break down at the singularity. Some theories suggest that there may have been a previous universe or that time may not have existed before the Big Bang.
No, there is currently no conclusive evidence of what existed before the Big Bang. The singularity at the beginning of the universe is beyond the reach of our current technology and understanding of physics.
It is currently impossible to know what existed before the Big Bang with any certainty. However, ongoing research and advancements in technology and theoretical physics may one day provide more insights into this mystery.
The concept of time as we know it may not apply before the Big Bang. Some theories suggest that time may have begun with the Big Bang, while others propose that time may have existed in a different form or dimension before the universe began.