froeb

6 ms·

1.
by froeb 4y ago
Alright fair enough, I'm not an expert on how those work. I was under the impression that there is quite a bit of work that has to be done to turn a path integral into something amenable to Monte Carlo though.
2.
by froeb 4y ago
This is a pretty common misconception of path integrals from how Feynman explains them to a non-physicist audience. The path integral formulation cannot work from a particle-based approach, where you integrate over all possible trajectories
3.
by froeb 4y ago
It isn't the only way. I would argue that the "sum over paths" is more of a convenient language for categorizing QFTs than an actual statement of physical reality. Path integrals have the benefit that they can be easily conne
4.
by froeb 4y ago
The textbook black hole is unphysical though, it assumes spacetime is asymptotically flat. As far as I can tell, the paper's claim is that if you do black holes more realistically, including better boundary conditions, then you can fin
5.
by froeb 4y ago
In physics at least, it's been my experience that even though the percentage of women physics professors is low, almost every one is an above-average researcher. They are certainly harder working on average. Meanwhile, there will be se
6.
by froeb 4y ago
Supernova simulations are especially interesting too. I have heard them described as the only time in physics when all 4 of the fundamental forces are important. The explosion can be quite finicky too. If I remember right, you can't ge
7.
by froeb 4y ago
A lot of crazy sounding physics theories involve some non-trivial tweak to the laws of physics as we know them (e.g. the Alcubierre drive, many exotic dark matter theories, ...) so I usually dismiss them as unlikely. However, from what I ha
8.
by froeb 4y ago
Her criticism doesn't have much substance though, she says explicitly she can't follow one of the main arguments of the paper. I skimmed the paper myself, and it is quite esoteric, but it doesn't seem like nonsense to me. I w
9.
by froeb 4y ago
I took some time to skim the original paper and learned about cosmological coupling for the first time! My understanding is that black hole solutions in an expanding spacetime have way more freedom than the regular Kerr solution, because Bi
10.
by froeb 4y ago
This is a pretty confusing article. I think the conventional understanding is that dark energy is associated with empty space itself. Is this article discussing a proposed mechanism for dark energy, or an alternate explanation altogether? W