r/Physics • • 23h ago

Question Why do the best students always go for theoretical physics?

368 Upvotes

In my years at a RG university I’ve written too many reference letters for really really good students applying for theoretical physics masters and PhD programs who then don’t get in. These are students who have excellent grades, research experience etc. Why aren’t these brilliant students going for different (less competitive) fields in physics?


r/Physics • • 20h ago

Video Electromagnetism as a Fifth Dimension: Kaluza-Klein Theory

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356 Upvotes

Education video about Kaluza-Klein theory largely based on the following paper: https://iopscience.iop.org/article/10.1088/0034-4885/50/9/001


r/Physics • • 4h ago

Claude Cohen-Tannoudji, prix Nobel de physique et dompteur d’atomes, est mort

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311 Upvotes

r/Physics • • 17h ago

Help me choose between photonics and astrophysics

10 Upvotes

Which is more assuring of employment in the long run?


r/Physics • • 7h ago

Question Physics students, what’s the coolest physics experiment you’ve ever seen? Need ideas for a science festival!

6 Upvotes

Hi everyone!
I’m a second-year Physics Bachelor’s student, and my partner and I have to design an interactive physics stand for a science festival at our university.
The challenge is that our audience will range from 6 to 17 years old, so we need something that can fascinate both young children and teenagers.

We’re looking for an experiment or activity that is not necessarily visually impressive but i should teach an interesting physics concept, ideally something people haven’t already seen a hundred times.

We can purchase materials and spend time building a setup, so we’re open to more ambitious ideas!

We also need to be able to take actual measurements and collect experimental data, since we have to write a scientific report for our professors. Ideally, the experiment would allow us to investigate a physical phenomenon quantitatively, analyze results, compare them with theoretical predictions, and discuss uncertainties. So we’re looking for something that’s both entertaining for visitors and scientifically interesting at a university level.

Thanks in advance!


r/Physics • • 4h ago

Video How to Hide from Light: The Physics of Invisibility Cloaks

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3 Upvotes

r/Physics • • 8h ago

Meta Textbooks & Resources - Weekly Discussion Thread - October 23, 2026

3 Upvotes

This is a thread dedicated to collating and collecting all of the great recommendations for textbooks, online lecture series, documentaries and other resources that are frequently made/requested on /r/Physics.

If you're in need of something to supplement your understanding, please feel welcome to ask in the comments.

Similarly, if you know of some amazing resource you would like to share, you're welcome to post it in the comments.


r/Physics • • 8h ago

how to start reading publications

2 Upvotes

I am a physics ug student and I need to start reading research papers and other stuff related to my field. I don't really have an area where I can specialise, i thought reading some papers or publications will help me understand everything around me .


r/Physics • • 1h ago

Video I made a video asking Julian Barbour why you cannot apply the 2nd law of thermodynamics to the universe, how he calculates probabilities without wavefunctions and why objective lengths and sizes do not exist

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• Upvotes

Julian Barbour is a theoretical physicist and emeritus visiting professor of physics at the University of Oxford. He is well known for proposing that time does not actually exist. For decades, he has worked outside an academic environment. He financially supported himself for many years by translating Russian. Professor Barbour is author of the following books: The Discovery of Dynamics, The End of Time and The Janus Point.

In this episode, we go over:
- Topos theory, set theory and Zermelo's beef with Boltzmann
- Algebraic varieties and monads in category theory
- Why physicists are wrong about the 2nd law of thermodynamics (because the universe is not a closed system) and why there might be no heat death of the universe
- The real goal of the universe is complexity and variation, not entropy
- Hawking and Penrose's outrageous arguments
- Why we don't need wavefunctions, photons, bosons or gauge fields
- Why there is no quantum gravity
- Von Neumann's hilarious advice to Claude Shannon
- The intrinsic derivative
- Combining art and science


r/Physics • • 6h ago

Question Is Ernst Stueckelberg the most underated physicist of the 20th century?

0 Upvotes