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Thread: Quick question about relativity

  1. #1 Quick question about relativity 
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    Hi. I often see that it's an accepted consensus that the laws of physics break down at a singularity (or Big Bang).
    But does that mean that relativity itself crumbles as well?

    Sorry for asking so straight.


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    Quote Originally Posted by Rizols View Post
    Hi. I often see that it's an accepted consensus that the laws of physics break down at a singularity (or Big Bang).
    But does that mean that relativity itself crumbles as well?

    Sorry for asking so straight.
    What it means is that the theories are models to describe reality. We cannot see any reality directly, so we must model reality and try to make these models as accurate as possible.
    When it comes to the interior of a Black Hole, the conditions are so extreme that these models are still unable to fully describe what the properties are and what goes on.

    If we had a more accurate and detailed model, that covered such extreme conditions, then that model would not "break down" or stretch into infinities. Currently, we lack the information needed to build such a model.


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    Relativity also not clear most of physicals prospective of "spacetime" , it describe it mostly as mathematically.
    It also not mention whether exists physically or not
    whether it is more fundamental than mass/energy
    or mass energy are more fundamental
    like gravity which is an affect of mass/energy and its existence depends on mass/energy and not more fundamental than mass energy
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    Quote Originally Posted by Rizols View Post
    Hi. I often see that it's an accepted consensus that the laws of physics break down at a singularity (or Big Bang).
    But does that mean that relativity itself crumbles as well?

    Sorry for asking so straight.
    Special and general relativity are not valid models to describe the immediate vicinity of singularities, because they are classical theories, i.e. they do not incorporate quantum effects. Those effects cannot be ignored in those circumstances; one would need a model here which combines gravitation and quantum theory in a self-consistent manner. There are candidate theories for this ( String theory, Loop Quantum Gravity etc etc ), but we don't know yet if one ( or indeed any ) of them gives us the correct physics. This is a matter of ongoing research.
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    Quote Originally Posted by Markus Hanke View Post
    There are candidate theories for this ( String theory, Loop Quantum Gravity etc etc ), but we don't know yet if one ( or indeed any ) of them gives us the correct physics. This is a matter of ongoing research.
    Nitpick: As they are untested and String cannot currently be tested and therefor completed, I defy the use of the word, "Theory."
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