/sci/ - Science & Math

https://simple.wikipedia.org/wiki/Dark_matter

Stuff that we don't know what it is.

>>9780911
Read about the work of Vera Rubin.

>>9780911
Mostly black holes and rogue planets. AKA regular matter.

>>9781024
> black hole
> regular matter

It's shit that we can't see because it refuses to reflect photons of any frequencies. Only way we've got of observing it is through it's gravitational properties. It appears to be the cause of many gravitational anomalies on an intergalactic scale.

It's borderline impossible for us to find out more than that in the next 1-10 millenia. It's just too big in scale for us.

Because it's so mysterious, when it gets studied and figured out, we will likely find the missing parts to the unifying theories of physics from it.

All we know is that it has mass, doesn't interact electromagnetically (thus doesn't interact with light at all), and doesn't really interact with itself.

So it's definitely not baryonic. And almost certainly not any kind of lepton. So we don't know what it is.

Dark matter could be composed of the lightest supersymmetric particle, if it can't decay into ordinary matter and SUSY is correct.

>>9781094
>SUSY
>correct

>>9781104
>if

IS DARK MATTER AN ACTUAL THING OR IS IT JUST A CATCH ALL FOR AN IMPERFECT THEORY OF PHYSICS????

>>9781152
We observe the universe and make note of how much stuff there is. We've already accounted for all visible matter, the kinds of stuff that modern physics knows about. Turns out there's quite a bit unaccounted for. It's matter that doesn't interact with light. We can deduce it's there, but we can't see it and don't know what it is. So we call it dark matter.

>>9781152
>it's there
WHERE

It's ghosts.

>>9781164
Wherever galaxies are.

>>9781152
We don’t know.

>>9780911
No one knows but observers can see it's gravitational effects. It can't be observed by any other means so far.
It's a mystery and my personal guess is that it's the effect of something outside of what we call our universe and we will never know.

>>9781025
>> black hole
>> regular matter
what's your point faggot

Contemporary term for luminiferous ether.

http://cds.cern.ch/record/408473/files/9911386.pdf

>>9781363
>implying black holes are made of matter

>>9781367
>$1.43 has been transferred to your account by the SAFIRE project

>>9781393
So basically this squad theorised that
>The universe is a 4th spacial dimension fold in a brane that is continuously folded upon itself in this unseen spacial dimension. Matter from other universes is close enough such that it's gravitational force can be felt in our universe, yet far enough such that light is unable to traverse the fold on its way here.

Sounds pretty gay to me.

>>9781470
lol ur gay

>>9781470
Makes sense to me...

>>9780911
a meme to get this reaction

Dark matter is the intangible part of the universe. Where God lives. We can't see it or interact with it because we are tangible and living.

We can calculate how quickly galaxies should be drifting apart

We can observe how quickly galaxies are drifting apart

Turns out there is a discrepancy between these, galaxies are drifting apart quicker than the amount of observable mass would pull them apart.
So there must be some non observable mass pulling on these galaxies through gravitational forces

That is what we call dark matter

>>9781152
it's the second one. theories are full of catch-alls. Take the Higgs-Boson. The math said it was there but it took a while to prove it. it could have been something else but humanity is pretty good at math so the chance of that was pretty small. Doesn't mean dark matter is necessarily real in the context that people put it in but it most likely is because numbers don't lie.

>>9781024
>MACHO theory
explain hubble's parameter then, genius

>>9781966
only correct response ITT

>>9781962
Prove it. Oh wait you can’t because God is fake.

>>9782124
MACHOs are undoubtably some small part of the dark matter we observe, but it’s mostly WIMPs

>>9780911

>>9782152
You’re welcome to find the missing mass, sweetie.

>>9782135
Intangible. Not fake. Why would you think only things you can see and touch are real? Got blinders on much? Study a little quantum physics. See your opinion change.

>>9782152
What's wrong with this logic?

>>9780911

>>9782289
Nothing about quantum physics suggest a magical sky fairy, and dark matter is just WIMPs and some MACHOs.

>>9781966
Could our calculations be wrong?

>>9782152
that makes sense though. it was theorized to be 1 and hey look at that, 1 is the closest number that fits. This is called algebra for those who don't know it.

>>9780911
Personally I'm betting it'll be a lot more boring than we expect

Like just big clouds of neutrinos, or some relativistic twisty spacetime that only shows up in high-precision calculations

>>9782309
>a magical sky fairy
indeed...but an observer...

>>9781035
so how do we know that it's real? doesn't that mean there's gravitational stuff we haven't figured out instead of coming up with this thing called "dark matter" which is invisible and doesn't actually exist in any way

>>9782747
Well, it's really a question of choosing which way to interpret the data
We know that things in space behave like there's matter we can't see in some spots according to our current model. What's more likely?
>There's stuff right there that we can't see, which seems perfectly reasonable given that we already know there are things we can't see

Or

>The theory is wrong in a way that coincidentally looks exactly like there's extra matter in some places, right down to the orbits

>>9782763
well what stuff then? just because their calculations for universe expansion and galaxy distance were off? sounds more likely that it's just some aspect of gravitational waves and spacetime that affects matter that we don't know about therefore can't take into account with our calculations than
>it's this completely invisible to any wavelength thing that totally exists because we needed something to correct our calculations

>>9782779
You do realize things that are invisible to any electromagnetic wavelength are not that exotic, right? All it takes is to be an electrically neutral fundamental particle.

>>9782785
that's not what i implied. just that it's a particle without mass that has force, instead of them saying it does have mass

>>9782315
Could be, for example Eric Verlinde is working on a theory about emergent gravity that would solve this dark matter problem. But the current theories work so well for everything else so it's the best we have currently. Verlinde's theory only works in very very specific situations

>>9782152
1 + 1 ≠ 3

1 + x + 1 = 3

X = 1

What's wrong with this

>>9781152

That is correct my child. Dark matter doesn't exist and its just a place holder for relatively unexplained things.

>>9782994
>>9782627
Because it's not 1. It's "something that's kinda like 1 to make the math work but not really because it doesn't behave like 1"

>>9782994
|(1,0,0)+(0,1,0)|!=sqrt{3}
|(1,0,0)+(0,0,1)+(0,1,0)|=sqrt{3}

>>9780911
its made up

>>9780911
it doesn't MATTER XD

>>9782729
An observer magical fairy.

There's no need to invent an entity in order to explain the discrepancy.

Notice you're not referring to your observer's mass. You're creating a being, you're defining his actions, his volition, his attitude. That's entirely bonkers. I can say that dark matter is your observer's turds. It's just as valid and true as your statement.

>>9783287
The equation that doesn't add up is about mass, and dark matter has mass exactly the same as normal matter.
If you received £3, £1 from me, £1 from my wife and £1 from the government, one of those £1s was different from the other two, coming from an organisation not an individual, but from a monetary point of view you've still you £(1+1+1) = £3. The fact that the mass is of a different nature to the mass we've already documented does not change the fact that the mass adds up, just the same as any other mass.

>>9781094
The Large Hadron Collider has basically killed supersymmetry, so that's right out.

>>9783697
>Tfw the censor on my QFT exam started going on about how "supersymmetry makes life so much easier for you"

True believers in SuSy never let it go

>>9783707
Criminy. Even the Dark Matter search space for Weakly Interacting Massive Particles is coming out against SuSy at this point.

>>9783710
To be fair, the guy is a mathematician first, quantum field theorist second, so that probably explains it.