Naked Science Forum

Non Life Sciences => Physics, Astronomy & Cosmology => Topic started by: Barnacle Ben on 20/08/2020 17:58:34

Title: Would we exist if Dark Matter was physical?
Post by: Barnacle Ben on 20/08/2020 17:58:34
Is there a limited range in the bending of spacetime in which decoherence can occur? Is Dark Matter out of this range?
Title: Re: Would we exist if Dark Matter was physical?
Post by: Barnacle Ben on 20/08/2020 18:16:18
You seem to think there is proof of Dark Matter being physical other than spacetime bending.
Title: Re: Would we exist if Dark Matter was physical?
Post by: Halc on 20/08/2020 18:29:41
You seem to think there is proof of Dark Matter being physical other than spacetime bending.
I don't even think there is proof that my coffee mug is physical, but yes, it seems that if the mug is physical, dark matter probably is as well.

I suppose it depends on your definition of 'physical'. You haven't actually provided one. How might I go about providing evidence that the mug is physical?
Title: Re: Would we exist if Dark Matter was physical?
Post by: Barnacle Ben on 20/08/2020 18:34:47
Your mug is decohered.
How much space would Dark Matter occupy if decohered? Would it be enough to block out the sun?
Title: Re: Would we exist if Dark Matter was physical?
Post by: Halc on 20/08/2020 18:56:47
Your mug is decohered.
OK, that's the tie in to decoherence.
Yes, it is. So is dark matter, since we can measure its effects just like measuring the effects of the mug.

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How much space would Dark Matter occupy if decohered?
How much space does the mug occupy?  I can argue that it doesn't occupy any of it, but it has significant EM influence over a volume of perhaps 100cc.  Dark matter isn't really in a form that has a meaningful value for 'volume'. It's everywhere, including within my mug. You can ask the mass of it in the volume occupied by a typical mug, and the answer would be 'not much'.

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Would it be enough to block out the sun?
Dark matter doesn't interact with light, so it isn't going to block out the sun.
Title: Re: Would we exist if Dark Matter was physical?
Post by: Barnacle Ben on 20/08/2020 19:22:56
Fine, what if dark matter was opaque?

Interesting how you can insist on something being physical only from a bend in spacetime. As if mass in coherent form couldn't do that.
Title: Re: Would we exist if Dark Matter was physical?
Post by: chiralSPO on 20/08/2020 19:49:25
Fine, what if dark matter was opaque?

What if dark matter had herpes? Should I get tested?
Title: Re: Would we exist if Dark Matter was physical?
Post by: Barnacle Ben on 20/08/2020 19:52:57
Did I spell something wrong? I wasn't allowed to ask how impossible life would be if dark matter was visible?
Title: Re: Would we exist if Dark Matter was physical?
Post by: chiralSPO on 20/08/2020 20:21:56
No spelling errors. It just doesn't make much sense scientifically (logically) to ask a question like, "what if dark matter weren't dark matter?"

Dark matter, by its very being and definition, does not interact with light. If it did, it wouldn't be dark matter.

My previous post was an admittedly snarky way of pointing that out.
Title: Re: Would we exist if Dark Matter was physical?
Post by: Barnacle Ben on 20/08/2020 20:29:02
So you don't question why it is transparent? As if something had to decide to make it so for us to be here.
Title: Re: Would we exist if Dark Matter was physical?
Post by: Kryptid on 20/08/2020 20:38:35
Is there a limited range in the bending of spacetime in which decoherence can occur? Is Dark Matter out of this range?

Oh lookie, isn't that convenient. You said the exact same thing as PittsburghJoe did right here: https://forums.livescience.com/threads/do-em-waves-have-polarity-and-gravity-when-coherent.3376/

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Is there a limited range in the bending of spacetime that decoherence can occur?
Is Dark Matter out of this range?

As much hate as you give us, PittsburghJoe, you sure do like coming back here for more punishment, don't you?