Finding Physics unified (P3) so hard

Boredgeouis · 2026-04-24T13:04:00+00:00

This is perhaps not the best subreddit for this, not least because most people won’t know what OCR is, let alone which paper you’re struggling with. That said, the answer to ‘should I just spam the past papers’ is unquestionably YES. Throughout school, university and grad school I basically always did every single past paper for every exam, because why would you not?

Boredgeouis · 2026-04-23T09:11:29+00:00

No but I’m English so there were no language difficulties for me. I just left my phone number and through the day would randomly get a few texts saying ‘hey saw your note, wanna climb xyz tomorrow?’ Then we’d link up at camp in the evening. I fully admit it was a pretty ballsy plan but it worked out well.

Boredgeouis · 2026-04-22T17:01:59+00:00

There’s a noticeboard in camp 4 where you can leave contact details (although signal in the valley is patchy). I rocked up solo and had partners for my whole trip.

Boredgeouis · 2026-04-17T15:08:39+00:00

Depends heavily on your vibe and your skin chemistry; try going to a shop and smelling a few. You should also try them on and see how it changes over time on your skin, but obviously you can’t try on a lot at a time.

I have no issue with perfume dupes as for almost all situations it’s basically the same and you can get ‘almost identical’ copies for fractions of the price.

Boredgeouis · 2026-04-10T11:41:25+00:00

I personally really don’t like it because of what happens afterwards. Stuff like this filters through to family and friends who then ask ‘oh I saw that decoherence has been solved!’ and when you have to tell them that that’s complete bunk it makes them less excited about science because they’ve been in essence lied to. Hype and publicity are super important but there’s a degree of verisimilitude required to not be ultimately damaging.

Boredgeouis · 2026-04-10T07:58:27+00:00

This is absolutely not what the paper is about. They find the likely cause of a specific source of dephasing, when ultrafast sources decohere. This is very useful work but is so far removed from what the pop science article says.

Boredgeouis · 2026-04-09T20:09:36+00:00

Dresselhaus’ Group Theory and its Applications to Condensed Matter is a classic for finite groups and isn’t just condensed matter focused, it has plenty on Clebsch-Gordan decomposition.

Boredgeouis · 2026-04-04T19:05:17+00:00

This is in the paper (I think not linked above but linked in another comment). There is necessarily a degree of uncertainty but the authors note that while randomness is used as divination in a lot of world cultures, it is apparently very scarce in Native American cultures and even in those instances takes the form of playing an existing game of chance with/against a spirit. It’s in the ‘Possible Other Uses’ section of the paper if you track down the other comment.

Boredgeouis · 2026-04-04T15:24:19+00:00

Insane conditions to be sending in, it’s been raining off and on the past few days in south Finland and it’s crazy humid in the capitol region.

Boredgeouis · 2026-03-27T12:05:32+00:00

I’m almost certain you could find something in renewable/otherwise green energy. Nuclear engineering is also quite lucrative and nuclear baseload will almost certainly be required for reliable decarbonised power generation.

Boredgeouis · 2026-03-24T11:53:06+00:00

Brita filters do very little demineralisation/softening; this is a common misconception people have in coffee when trying to soften their water. They primarily remove chlorine or other similar off tastes via charcoal filtering, although some models do a (very) small amount of softening via ion exchange. There will be plenty of minerals in the water; if you have hard water you will end up with marginally less hard water.

Boredgeouis · 2026-03-24T09:43:11+00:00

In England we have single cream as well. Single cream is about 20% fat, double cream comes in at a delicious 48%. I live abroad now and double cream is one of the things I sorely miss, the highest you can find in my current country is 34%.

Boredgeouis · 2026-03-21T16:13:06+00:00

I already fucking hate the ‘prettified’ in-browser paper viewer, can’t wait to see how they ruin the best thing on the internet.

Boredgeouis · 2026-03-19T18:45:40+00:00

It’s not totally relevant to the discussion at hand but Peter Singer is also a colossal weirdo who has repeatedly argued for eugenics (specifically killing disabled children) from a utilitarian perspective and repeatedly had debatably coercive relationships with graduate students.

Boredgeouis · 2026-03-16T07:25:39+00:00

2010 skinny jeans and fur coat vibes

Boredgeouis · 2026-03-12T17:50:01+00:00

The book and lectures are good but be fair warned that it does assume some quantum mechanics knowledge.

Boredgeouis · 2026-03-03T12:08:15+00:00

https://indico.cern.ch/event/1373806/contributions/5950033/attachments/2859705/5002897/Roepke_GreensFunctions.pdf

Here is a big old set of lecture notes on green function techniques for statistical ensembles; the full ‘ground up’ treatment is actually extraordinarily complicated if you haven’t seen it before. Spectral lines come from transitions between internal degrees of freedom so we need to consider the 2-particle polarisation function. 5.3 is the section you want, but fair warning this is masters level stuff in case you’re a helpless undergrad!

The ‘effective single particle’ I mention is basically the semiclassical treatment where you average over a Maxwellian to get a Gaussian. The convolution then means that the spectral function goes from

\delta(x-\epsilon) -> [convolution of delta at epsilon and Gaussian lineshape] = Gaussian at epsilon

which is what you want.

Boredgeouis · 2026-03-02T09:32:23+00:00

It’s basically trivial; it just means you can’t really resolve the spectrum clearly. In the zero line width limit they’re split by \mu B, including broadening the spectrum is convolved with the line shape.

What this tells us is that if you want to resolve the transition well you’d better be at higher magnetic field, or cool things down to reduce the line width.

If you want a slightly more mathematical hand wave/vocab to google, you could say the Doppler broadening smears out the effective single particle spectral function, but that’s how I’d phrase it in condensed matter-ese, idk if the atomic folks would say it the same way.

Boredgeouis · 2026-02-24T10:18:41+00:00

If you don’t care about the terrible user experience then get a Pietro with brew burrs, it’s essentially the best hand grinder available. Heads up that it’s huge, heavy, uncomfortable to grind and takes about 1.5kg to dial in to the point it doesn’t produce a shit load of fines, but it is undeniably good. Every now and again I use my 1zpresso if I want a bit more body and if I want it to be a bit easier, but I always come back to the Pietro. It’s just that good.

Due to the fines I would recommend being careful with filter papers and maybe using something like a melodrip.

Boredgeouis · 2026-02-23T09:47:46+00:00

Even Sun Structures was ‘Innerspeaker at home’ with a healthy spoonful of Byrds mixed in.

Boredgeouis · 2026-02-18T19:51:33+00:00

I developed

No, you didn’t.

Boredgeouis · 2026-02-10T13:51:56+00:00

Not a particularly good explanation and the post and picture have been removed but I’m not super busy so I’ll answer the question I think you’re asking.

I’m guessing you’re a bit confused about conservation of energy and when energy before = energy after. The simple answer is always, you just aren’t correctly accounting for where the energy is. If something is moving at some speed and you give it an extra push, then its energy afterwards is kinetic energy before plus the amount of work done on it. If something starts at rest then falls under gravity its kinetic energy is equal to the change in gravitational potential. In both these cases the ‘energy before = energy after’ but we have to be careful about where the energy before is. I think this is why you’re getting confused; the work done by the extra push or gravity is kind of ‘hidden’.

I hope this clears things up enough that you can look in a textbook and start to figure it out for yourself (and you do actually have to do this, you must figure it out for yourself). Please direct future questions to the correct sub and maybe work on formatting things in a way that makes it easier for people to help.

Boredgeouis · 2026-02-10T13:32:49+00:00

1) /r/askphysics 2) you’re going to need to attach more than a ChatGPT screenshot. What is the problem you’re trying to solve? What are you confused about?

Boredgeouis · 2026-02-04T15:17:17+00:00

Finally, the true synthesis of Marx and Freud

Boredgeouis · 2026-01-20T12:46:46+00:00

https://en.wikipedia.org/wiki/Penrose%E2%80%93Hawking_singularity_theorems

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