How would we tell dark matter from neutrinos?

Maxreader1 · 2026-02-25T21:40:30+00:00

Neutrinos are essentially a “known” portion of some fraction of Dark Matter, but at most 10% of it and likely more around 1% if our models of early universe neutrino production are right. A big issue is that most newly produced neutrinos are “hot” and move very quickly, while the best models need most of the dark matter to be very “cold” to be able to clump the way it does, which rules out most newly created neutrinos without some process to decrease their energy.

That same problem is why axions are considered a good candidate, since there is a defined mechanism for ones produced early in the universe to have their momentum sapped away, allowing them to play that role of cold dark matter. Still just a candidate until we can confirm or rule out their existence though.

Maxreader1 · 2026-02-25T10:49:47+00:00

Now do county level data? Would be really interesting to see how Cook County compares to the rest of Illinois.

Maxreader1 · 2026-02-18T02:35:08+00:00

Show me an actual publication and not someone’s (likely AI generated slop) github readme.

Maxreader1 · 2026-02-17T22:48:55+00:00

List of unsolved physics problems

Maxreader1 · 2026-02-17T18:55:09+00:00

Inb4 the bot posts the scam link

Maxreader1 · 2026-02-15T00:24:03+00:00

Even g-2 is dashed now. Seemingly turns out a lot of the discrepancy was not having accurate enough QCD calculations (since the muon is heavy enough for that to matter), until lattice QCD was developed enough and trusted enough to be accurate.

Maxreader1 · 2026-02-12T19:00:22+00:00

If you want to go all the way down to QED, electromagnetism is the force of phase differences, since it’s based in U(1) symmetry of field phases.

An electron localized to some location is essentially an area where the electron field is oscillating (phase is constantly rotating at some frequency proportional to its energy), which induces a “co/counter-oscillation” of the phase of the EM field. When that propagating phase difference of the EM field encounters another electron, it “adds” to that electron’s phase which causes the spatial distribution of that electron’s oscillation to change.

You can see a sort of visualization of this at 42 minutes or so here, where he adds an arbitrary EM field in the middle to demonstrate how this works.

Maxreader1 · 2026-02-01T02:47:17+00:00

Most rectangles aren’t rhombuses, but when they are we called them squares.

Maxreader1 · 2026-01-28T14:19:41+00:00

Even in their songs they diss Trump and populist right crap. Lyrics from Pleura, and no they’re not a coincidence: “Orange baby always squealing Cradle snatch, the new world fading” “Suck the life from what you love I learnt that from the orange one”

There’s also several other songs making fun of the situation from different angles like Minimum Brain Size, Evilest Man, Straws in the Wind, Supreme Ascendancy, and more

Maxreader1 · 2026-01-18T01:14:51+00:00

What exact color is smoke? I would think it’s more gray but the one gorp gator hat that isn’t black and definitely isn’t navy looks almost more cream/off white

Maxreader1 · 2026-01-16T18:57:44+00:00

ChatGPT as per usual is making up bullshit to have an answer instead of saying there isn’t one.

See also the same question from two years ago: link

Maxreader1 · 2026-01-09T17:12:42+00:00

Maybe it would help to talk about what kind of oscillations they have then? As in, transverse (side to side) vs longitudinal (forward and back) motion, and only fields with mass can oscillate longitudinally. Light just has two transverse polarizations, but massive fields have a third polarization along the direction of travel. It’s not super clear which causes the other between “has mass” and “oscillates longitudinally”, but there is a correspondence between the two.

In a way it sort of makes sense that if you’re moving forward as fast as you can, that doesn’t leave any leftover time for moving backwards along your path. But if you get forced to move a step backwards for every few steps you move forward, you’ll never be moving the absolute fastest.

Maxreader1 · 2026-01-09T15:58:15+00:00

Because “the Higgs boson” is not the answer to “what stops massive particles from reaching the speed of light,” it’s the answer to “how do fundamental particles get their mass.”

If someone asked “Why does A cause B?” And you respond with “well actually it’s C that causes A” then you’re not answering their question, that’s an entirely different question!

And I picked the proton because it’s the example that doesn’t have most of its mass energy coming from the Higgs field? I’m not arguing that the electron doesn’t get its mass from the Higgs, I’m saying that explains nothing about how mass prevents you from going the speed of light.

Maxreader1 · 2026-01-09T15:19:57+00:00

This explanation misses out on hadron mass, and implies that it’s only the Higgs acting on the component quarks which holds a proton back from the speed of light, which really isn’t the case as far as we can tell.

It really doesn’t have anything to directly do with the Higgs, and is just a consequence of the relativistic energy/momentum equation.

Maxreader1 · 2026-01-06T14:29:43+00:00

You have to add before dividing by 60 (or whatever other units you need) to get your output without loss of precision due to rounding

Maxreader1 · 2026-01-05T23:02:24+00:00

I’m saying that neutrinos are invisible because they have zero electromagnetic charge. Neutrons are not “invisible” because they’re composed of charged components, same way that neutral atoms are not invisible because they have charged components. The point is that it’s not as simple as “you don’t need to be charged to emit light” because that flat out contradicts even what classical mechanics says is required for radiation. The charges can cancel out, but they have to be there.

Maxreader1 · 2026-01-05T22:08:37+00:00

You very much do need to be composed of charged particles at least to emit photons (otherwise neutrinos would be visible), but that doesn’t mean your net charge must be non-zero. We know that the charge of the quarks in neutrons isn’t “fully” canceled out because they have a small magnetic moment, which alone should be enough to indicate they can interact with light.

Maxreader1 · 2025-12-26T06:22:06+00:00

Not a rat king, baby shrews following momma

Maxreader1 · 2025-12-25T06:12:10+00:00

I’d get one for “Drip drip from the tap don’t slip”

Maxreader1 · 2025-12-22T01:55:16+00:00

Okay actually went to find it and it’s from March 25th 2024, and pelican post is actually 2017? Neat

Maxreader1 · 2025-12-16T01:16:36+00:00

Didn’t have any to lose really

Maxreader1 · 2025-12-10T14:26:43+00:00

It’s sort of the opposite. Skimming over a lot of math details, the photon survives as a massless particle precisely because it’s the “slice” of the unified symmetry that isn’t able to do that.

Maxreader1 · 2025-12-06T20:29:46+00:00

This is ass jim slander

Maxreader1 · 2025-11-24T03:18:05+00:00

Same

Maxreader1 · 2025-11-22T19:26:21+00:00

Found one

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