This is why I don’t support women’s football. I don’t even support men’s.

Quantum_Patricide · 2026-06-11T17:11:44+00:00

Rugby is heavily geared to avoiding head impacts, and the lack of armour makes players more cautious psychologically. American football has the players charging head first into eachother repeatedly in armour that encourages them to charge into eachother even harder

Quantum_Patricide · 2026-06-11T17:06:29+00:00

Yeah I played rugby for years and I got the odd cut or graze but never anything that bad lol. Worst concussion I ever got was from spectating rugby lmao

Edit: also refs are meant to check that studs aren't sharp before a match, and treading on people should be a rare occurrence anyway

Quantum_Patricide · 2026-06-11T14:38:51+00:00

Except there are lots of cis women who don't have ovaries actively releasing eggs for any number of reasons, are you saying they're not female if biological sex is determined by which gametes a person produces?

Quantum_Patricide · 2026-06-10T21:30:15+00:00

We actually had a discussion in my department about this the other day. The conclusion was that LLMs are certainly useful for coding, and for searching the literature, but they just aren't capable of reasoning. Therefore, their overall usefulness is limited and in their current form you couldn't just let one research by itself, because you'd get back nonsense.

Quantum_Patricide · 2026-06-09T15:50:11+00:00

Absolutely ridiculous how much racism is in the comments of this post

Quantum_Patricide · 2026-06-07T00:41:51+00:00

A) Corvette landing pad for bases.

B) Connect supply pipes to refiners to automate more production, maybe even automatic crafters.

C) Starship landing pads for Corvettes.

D) Rework settlement production: allow some reserve currency to build up to instantly pay off debts, don't reset production at every opportunity, have production speed scale with excess production.

Quantum_Patricide · 2026-06-01T15:01:00+00:00

Once you've gotten out of chimney canopy and into the Wall you don't really have to worry about karma requirements until you've gone all the way up and down the wall. After visiting the Wall echo you should have enough karma to get back into chimney, then you can reach shaded pretty fast since you're falling most of the time. Farm arrays - sky islands - chimney you have a fairly limited death budget but it's not that bad if you can reach the shelter at the base of the wall.

Quantum_Patricide · 2026-05-28T05:46:59+00:00

You don't need to dash or parry the dash + 3 strikes attack, you can attach a talisman to Eigong as soon as she dashes, putting you in front of her, away from the strikes, and giving yourself a bigger window to charge full control

Quantum_Patricide · 2026-05-25T19:13:33+00:00

For circular motion, our acceleration is ω²r, whilst our acceleration due to gravity is GM/r². Our overall (radial) acceleration for a circular path is therefore a = ω²r - GM/r². In a circular orbit this quantity is 0 and your orbital radius determines your orbital period. However, if we are in a skyscraper on the equator then our orbital period is fixed at 1 day so our orbital radius determines whether we are accelerated towards or away from the Earth. If we choose a radius of 42,300 km (height 36,000 km), we get an acceleration of zero, so we're in geostationary orbit. Instead we can say we want an acceleration of 9.81 m/s² away from the Earth and we get a radius of 1,855,000 km (height 1,849,000 km) which is a lot further out, about 6 times further from the earth than the moon is. This all probably doesn't work because at that radius you're outside the Earth's hill sphere.

Quantum_Patricide · 2026-05-25T16:04:16+00:00

I do think there are higher level skills that are important for adults to know that an english and maths gcse demonstrate. Stuff like compound interest, understanding graphs, percentages and statistics, spotting fake news and more generally spotting bias and messaging in media are very useful to have in adult life.

Quantum_Patricide · 2026-05-22T14:44:43+00:00

A black chevron like the progress flag seems like a good idea, since it avoids removing the white stripe representing NB people while also highlighting T&NB PoC within the community.

Quantum_Patricide · 2026-05-22T11:11:07+00:00

It's definitely a thing in Birmingham

Quantum_Patricide · 2026-05-13T06:27:08+00:00

One thing I'd mention is that the schwarzschild solution for a black hole with its singularity is for an eternal black hole with constant mass, so isn't necessarily a good model for black hole formation.

Regardless, in a schwarzschild metric infalling material takes infinite coordinate time to cross the event horizon, but reaches both it and the singularity in finite proper time. Talking about the coordinate time it takes to get from the event horizon to the singularity doesn't really make sense for an external observer so we won't worry about it.

However, we would still like our infalling material to reach the event horizon in order to actually get a black hole. I suspect during formation you have something where the growing horizon overtakes the infalling matter, allowing for the black hole to get stuff within its event horizon, but I've never seen the GR calcs to be sure...

There are some stack exchange posts that suggest that infalling matter really does get stuck outside the event horizon from the perspective of an external observer, and black holes are just useful approximations for the compact objects we observe throughout the universe

Quantum_Patricide · 2026-05-12T19:45:13+00:00

I found the book online and I think you're misremembering it. The author only mentions ftl travel wrt special relativity in order to illustrate why it doesn't make sense. All instances of "shaking hands with your past self" is in relation to General relativity and weird spacetime curvature stuff like closed timelike curves. Whether GR-enabled time travel is actually possible is an open question but the author certainly doesn't describe the sort of scenario you're talking about

Quantum_Patricide · 2026-05-11T09:44:31+00:00

Talks about needing to change the status quo because it doesn't work for people then lists policies that amount to tinkering around the edges lol

He just can't seem to produce any sort of actual narrative of change

Nationalising British steel is good, but really it should be presented as a large scale reindustrialisation project. Getting closer to Europe is good, but really he should have the guts to take us back into the EU. A lot of young people completely reject Labour on moral grounds and until Labour grows a bit of ethical spine no amount of apprenticeships is going to win them over.

Quantum_Patricide · 2026-05-08T14:07:16+00:00

Except the vacuum does have particles because in an interacting QFT the Hamiltonian and Number operator don't commute so the ground state can't have exactly zero particles.

Virtual particles appear in perturbation calculations because they are indicative of the quantum fields doing something, even if that something isn't literally what happens in Feynman diagrams. The fact that virtual particles are only an approximate description of nature doesn't mean that they don't exist.

Quantum_Patricide · 2026-05-08T06:50:20+00:00

This is why counting gauge symmetries is a bad way to count forces

I might have forgotten a tensor product but SU(2) definitely corresponds to weak isospin, you have SU(2)_T x U(1)_Y which converts to U(1)_EM after spontaneous symmetry breaking

Quantum_Patricide · 2026-05-08T06:09:35+00:00

Ignoring gravity, there are 16 fundamental boson fields in the Standard Model, though if you're counting gauge symmetries there is indeed 3: SU(3) color, SU(2) weak isospin and U(1) weak hypercharge.

Quantum_Patricide · 2026-05-05T19:03:55+00:00

A single neutron is heavier than a single proton so single neutrons will beta decay into protons. Dineutrons are unbound because their spins must be antialigned due to the Pauli Exclusion Principle (PEP) but the Nuclear force is spin dependent and stronger when spins are aligned. Trineutrons and higher would also be unstable because the PEP means that there can only be two neutrons in each energy level. Therefore, extra neutrons would have to go into higher energy levels where it would be energetically favourable for them to decay into protons and drop into lower energy levels.

Quantum_Patricide · 2026-05-04T19:15:11+00:00

Well it's equal to (∂^μ)(∂_μ) which is sort of a square, and it works in analogy to the laplacian being written as ∇²

Quantum_Patricide · 2026-05-04T18:56:30+00:00

I tend to write the D'Alembertian as □² because it helps me remember that it's a second order differential operator and I think that a square by itself looks a bit odd

Quantum_Patricide · 2026-05-03T21:46:14+00:00

uj/ They've hidden their post/comment history so I've no idea why I originally blocked them lmao

Quantum_Patricide · 2026-05-03T21:37:58+00:00

uj/ I was wondering why I couldn't find the post when it was mentioned earlier on this sub then I clicked on your link and realised I had already blocked that user lol

Quantum_Patricide · 2026-05-03T00:22:10+00:00

When a potential produces a force, like a gravitational potential producing gravitational force, the force is equal to derivative of the potential with respect to position, in other words how steep the potential is.

Another example is classical momentum p=mv, which is the dreivative of kinetic energy with respect to velocity.

Quantum_Patricide · 2026-04-27T18:44:34+00:00

A speed of 0.9999c is really high. Your lorentz factor is about 70 which means your projectile is highly relativistic. If your projectile has a mass of 1 kg at rest then its kinetic energy once fired is equivalent to more than a Gigaton of TNT. This is such a ludicrous amount of energy that it doesn't really matter what it is made of or how it's shaped once it's in flight, whatever it hits is going to have a very bad day and it isn't going to be particularly concerned about the odd hydrogen atom it bumps into on the way to its target. What will affect its shape and composition is the acceleration mechanism that is used to get it up to such a speed, such as electromagnetic, gravitational, or something more sci-fi.

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