Vanessa Alexandra, B.Sc. / is on Nostr

Theoretical physics student from Heidelberg, Europe.

Interested in general relativity, quantum field theory (gauge theories and regularization in particular), statistical physics, geometric algebra, and finding a good geometric picture for spinors.

Currently enjoying the holidays.

Profile picture: A cat with a Higgs potential shaped hat; banner image: Sunset over Heidelberg viewed from the roof of the Institute for Theoretical Physics.

Last Notes

2024-09-09 06:44:39

- reply

@npub1c9m…9xjd Well, the German name for that game translates to "scissors, stone, paper", and unexperienced people have a reputation for starting with scissors over here

2024-09-09 06:44:39

- reply

@npub1c9m…9xjd Well, the German name for that game translates to "scissors, stone, paper", and unexperienced people have a reputation for starting with scissors over here

2024-08-26 10:05:44

- reply

@npub1knz…c73p I don't think they're plausible, because zero-dimensional energy without 3-momentum would violate Lorentz covariance.

2024-08-07 14:39:07

- reply

@npub1c9m…9xjd reminds me of this: https://www.lesswrong.com/posts/bcM5ft8jvsffsZZ4Y/the-parable-of-hemlock
TL;DR: variant of the No True Scotsman fallacy.

2024-07-15 09:40:07

- reply

@npub1knz…c73p oh, absolutely! The statistical physics analogue of the effective action is the free energy.

2024-07-15 08:44:04

Question for the #QFT people here: What's your favourite way to explain the effective action Γ[Φ]?
The most frequent explanation I see is "quantum analogue of the classical action", but that doesn't really seem to cut it - after all, classical field theories work completely differently from quantum field theories. Most notably, in classical field theories, you don't have correlation functions - you just have a unique field that describes the current state of your system.

2024-06-20 15:53:07

Two general relativity researchers meet for a duel. They bow to each other, turn around, walk away from each other for 10 metres, turn by 90°, walk another 10 metres and repeat the last two steps two times to face each other. They shoot and both miss.

2024-06-11 12:37:30

- reply

@npub1knz…c73p stroke

2024-05-30 21:11:28

- reply

@npub1knz…c73p That looks amazing, I'll have a look at it

2024-05-30 07:43:26

Right now I'm having the problem that I vaguely remember a (seemingly) useful equation, but can't find the reference. Now I'm questioning whether I actually saw this equation in reality or if it was just a nonsensical dream. Does anyone else here have this problem?