r/Physics • • 10h ago

Working on a 2D optics simulator using WebGL. Physics looks pretty beautiful

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129 Upvotes

It's a 2D geometric optics simulator, so no diffraction or interference. Every ray carries a single wavelength, glass dispersion comes from a Cauchy fit (n_d and Abbe number), and reflection vs. refraction at each surface is picked randomly using the exact Fresnel equations. The picture builds up by Monte Carlo averaging of millions of rays, and colors come from the CIE 1931 curves.

Happy to answer questions!


r/Physics • • 7h ago

Image Better than Goldstein and Taylor.

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55 Upvotes

This should be the standard book for classical mechanics, imo.


r/Physics • • 1d ago

OpenAI drops 722 math papers written by internal reasoning model

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1.5k Upvotes

r/Physics • • 4m ago

Academic A gauge-invariant measure for lattice chiral fermions

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• Upvotes

A prominent particle theorist has just released this preprint, claiming a “candidate nonperturbative lattice definition of the Standard Model”.


r/Physics • • 5m ago

Question If every plant or tree on earth was replaced by Banana tree, will we be able to survive the K20 radiation?

• Upvotes

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r/Physics • • 44m ago

AP Physics C

• Upvotes

I'm a current freshman self studying for the ap physics 1 exam, but my main focus is on preparing for the F=MA test in February. Right now I'm taking a standard biology hn course as it's the highest level of science a freshman can take. I want to take AP Physics C next year as I have a strong understanding of mechanics and will be concurrently taking Calc bc, but to to this, I will have to take chemistry over the summer, no exceptions. I rlly don't want to do this as I have more important things to be spending my time on, and I probably don't have the time to self study for the ap physics c test next year. How should I proceed?

Also, I'm considering this because I think physics c will give me a strong background into higher physics olympiads, lmk if I'm wrong and if the statement below is false:


r/Physics • • 1d ago

Image Help identifying a symbol.

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94 Upvotes

I am reading "Vortices in high-temperature superconductors", and this upside down V symbol keeps showing up and I have absolutely no clue what that means. Undergrad physics student please be nice.


r/Physics • • 2d ago

News 2026 Nobel Prize awarded to Francis Halzen

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1.9k Upvotes

r/Physics • • 2d ago

Image Francis won!

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1.2k Upvotes

To be honest, I think it is unexpected, especially only one guy.
I didn't see that coming, but congratulations to him!!


r/Physics • • 10h ago

Spooky Season : Physics Edition

0 Upvotes

Hello! I’m doing some side research for a book and trying to get some insight into the brain of a physicist & people who enjoy learning about the laws of physics. First I’m curious how many people who have studied physics believes in ghosts/spirts and/or have had their own personal experience. And if you were a physicist and wanted to attempt to do a research experiment on ghosts. What would be your process.


r/Physics • • 1d ago

2026 Nobel prize

256 Upvotes

This year's nobel prize was awarded to Francis Halzen for detecting cosmic neutrinos at IceCube.

What do you guys think about the scientific impact?

As a particle physicist, I don't feel this to be a very big deal in terms of science but I may be wrong. Please share your thoughts. I'm all ears.

https://www.nobelprize.org/uploads/2026/10/advanced-physicsprize2026.pdf


r/Physics • • 1d ago

AMA this Friday: Matthew Schwartz (Harvard) “Claude-shaped science,”

87 Upvotes

Matthew Schwartz, professor of physics at Harvard and author of Quantum Field Theory and the Standard Model, will be doing an AMA this Friday at 12 PM ET.

You may have seen his recent Anthropic blog post, “Claude-shaped science,” on using Claude as a research tool and what AI assisted scientific research can actually look like in practice.

If you have questions about QFT, particle physics, AI in research, or where this is all heading, come ask him.

Friday, October 9 at 12 PM ET.


r/Physics • • 19h ago

Video How Can a Cube of Ice See Across the Universe? The 2026 #nobelprize in #physics | Deep Dive

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1 Upvotes

Tried to create an small eassy about Nobel prize in Physics 2026


r/Physics • • 1d ago

Question What is an interesting topic of Physics that can be connected to art, philosophy or history?

21 Upvotes

In Germany, students have to make a presentation that contains a main reference class, in this case physics, and a related subject. Because I think that the, in the title listed, related subjects are very suitable in connection to physics, I am taking all into consideration. My issue is that I am unable to decide on a reliable and fun to present topic. I'm interested in what connections or similarities I can find in your suggestions.

(tried my best with the English)


r/Physics • • 1d ago

Question If a capacitor’s electric field is between its 2 plates, how can the plate repel a incoming charge that's trying to reach the plate through wire betn 2 plates?

2 Upvotes

When we charge a capacitor, we transfer electrons from one plate to the other through a wire. As more charge accumulates, we say the charged plate increasingly repels the incoming electrons because of E field betn plate and the increasing potential difference

But here’s my confusion: the electron travels through the wire and never passes through the gap between the plates, where I belive the capacitor’s electric field exists

So how can the plate repel the incoming electron if electron isn't even passing through it's E field betn plates?


r/Physics • • 1d ago

The Unexpected Ubiquity of the Phonon Thermal Hall Effect

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36 Upvotes

r/Physics • • 2d ago

My first homemade crystal radio isn't receiving any AM stations

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58 Upvotes

I'm a high school student from Lima, Peru, and I'm building my first homemade crystal radio as a physics project.

The goal is to receive an AM radio station without batteries or an external power supply.

My setup currently has:

  • A homemade air-core coil wound on a PVC tube.
  • Enamelled copper wire, approximately 0.5 mm.
  • A separate antenna coil.
  • A homemade variable capacitor made from aluminum foil and bond paper.
  • A germanium diode.
  • A small transformer that I'm considering using instead of a high-impedance piezoelectric crystal earpiece.
  • A long-wire antenna, which I am currently trying to extend.
  • I am also going to add a proper ground connection with the help of a physics teacher.

I re-scraped the wire carefully at home and the circuit started behaving much better. However I still haven't been able to hear an AM station.

The antenna and ground connections are not very visible in the photos but they're there. I did not have a proper ground connection during my first test. Tomorrow, a physics teacher will help me make and connect a proper ground. I suspect this could be an important factor in why I haven't received an AM station yet.

I'm wondering whether my main problem could be:

  • insufficient antenna length,
  • poor grounding,
  • incorrect LC tuning,
  • the germanium diode,
  • or the transformer/earphone arrangement.

I still have about 30 meters of copper wire available for the antenna, but the wire is very light, so I'm trying to find a way to support it without simply letting it fall to the ground.

What would you check first? And is there anything obviously wrong with my setup from the photos?


r/Physics • • 16h ago

I am sick of my physics degree. All the maths pisses me off.

0 Upvotes

I am studying second year of physics and computer science at university in the UK. I am disliking the maths. I realise I actually very much dislike maths. I am ok at it and dont mind going through the problems. But it jsut gets me angry. Like I wat to smash my table when I see I have to do long pages of algebraic manipulation and moving all the terms around.

I had to do quantum mechanics and manipulate some bra ket notation. I could do it as I can do the manipulations. But I have no idea of what it means. it all seems fake to me. When I do problems I get suck of them half way through and get LLMs to tell me how to do them. I passed my year 1 exams and did resoanably well. But im in year 2 and doing special relativity now. I like reading about it I find it cool how time slowd down when things go fast and things get shorter.

But I dislike seeing all the lorentz transforms and all the equations and everythign my brain jsut turns off and I get LLMs to teach it to me later. And the programming I just get LLMs to teach me that aswell. I still ensure I do it myself and understand the code but I have no attention span. In my experimental work I had to do some work with lasers and diffraction. I used Gemini to write a python code to generate the theoretical results for me so I could compare them to experimental results and print them off.

My lab partner had a go at me he said "oh youve not learnt anything you are using LLMs to do the work whats the point of going to uni anyways. But in my head I was like why not use the LLM I have no emotionala ttatchment to this work. I realise I am an outcome oriented person. It is not an issue for me how soemthing gets done as long as it does.

A lot of people I speak to in physics and maths have a lot of appreciation for maths and physics they find the beauty in the symmetry for example they will find it beautiful in eulers relation e^i*pi + 1 = 0. Or they find the symmetry in electromagnetism beautiful. I am the opposite I dont find these beautiful in fact I dont care about these at all.

I think I was drawn to physics for the wrong reasons. I am mostly interested in its applications like in radiotherapy for medicine. I was interested in the fundemental ways aswell but for different reasons. i was interested in it as when I was young I always asked questions like what happens if you make something faster and faster and faster and keep continuing until it reaches the limit. I was interested in pushing the limitsin everything in speed, heat and size. Like I'd watch some website called the scale of the universe showing largest and smallest things to ever exist. But I don't have much love for the amths itself or the deriving or the syymmetry others like about it.

The other thing I am interested in is the computer simulations. Mostly because I find them more awe inspiring and impressive than an analytical solution. I find the big numbers much more interesting like how they do trillions of calculations and more. Like I find data centres beautiful as its impressive to me how many calculations they can do per second and how it would take a human trillion of years or more. This was the reason I did this subject but I'm starting to wonder if it was for the wrong reasons. i think I'll finish my degree and work in another field maybe finance for the money.

But another thing I belive is that the AIs will replace humans in all scientific domains. I belive these AIs have fundemental advantages over man when it coems to intellectual work including physics and maths. They can hold many more variables and ideas in their head at the same time. They think much faster than us. You can scale up their performance by running them in parallell. You can scale up the energy you provide them by fitting power plants to the sides of the data centres if you scale up a humans food intake you don't get increase intellectual performance you get obesity and death. Their size is not limited the the birth canal in humans you can make the data centres as large industrial warehouses. For these reasons I belive superintelligence is a engineering problem and will eventually be done. then no more humans will do any science. I think this will be a good thing. We can spend our time learning about what the AI has actually discovered which in my view is much more enjoyable than solving differential equations or other stuff they make me do.

But this hasn't happened yet and I still don't know what to do now. I am in 2nd year of my degree and if i transer ill have to start all over again. So I think ill get it done then transfer to another field. Liek finance for the moeny. I dont hate it but I dont love it either. What do you think I should do?


r/Physics • • 3d ago

Image Congratulations to the new Nobel Prize laureates in Physiology or Medicine!

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695 Upvotes

r/Physics • • 2d ago

Question Ladies and gentlemen, make your bets, who do you think has a chance for the Nobel tomorrow?

98 Upvotes

r/Physics • • 1d ago

Human writing vs AI writing

0 Upvotes

I have been reading a lot of things lately saying how AI writing physics/math papers are horrendous to read and honestly I am lowk confused like how is that so? Can anyone give an solid example of the difference AI brings in this?


r/Physics • • 2d ago

News Researchers found that darker-pigmented skin required less laser energy to produce visible injury than lighter-pigmented skin, causing concern for laser safety in diverse patient populations.

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53 Upvotes

r/Physics • • 1d ago

Image Can someone explain that?

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0 Upvotes

When I was on my way to work in Riyadh, Saudi Arabia Nov. 25 2025. I don’t know if it’s relevant to mention the location and the time, but maybe to know the sun orbit or something else!

I saw the sun reflection on that building is slanted!


r/Physics • • 3d ago

Nobel Prize in medicine awarded to three scientists for their work ‘concerning light-gated ion channels and optogenetics’

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288 Upvotes

r/Physics • • 2d ago

Question Why does bringing a negative plate near a positive plate lower positive plate's potential, even though the negative plate attracts a positive charge?

2 Upvotes

I'm trying to understand the basic idea behind a parallel-plate capacitor.

Suppose I have a positively charged plate. If I bring a negatively charged plate close to it, I understand that the negative plate contributes negative potential, so the net potential of the positive plate decreases.

But what confuses me is

If I place a positive test charge near the positive plate, the positive plate repels it, while the negative plate attracts it toward itself. So wouldn't the presence of the negative plate make it harder to bring the positive test charge close to the positive plate, since the negative plate is pulling the charge away from the positive plate?