antognini

4 ms·

1.
by antognini 6d ago
I'd recommend Carroll & Ostlie's Introduction to Modern Astrophysics, though it requires some basic calculus and physics.
2.
by antognini 7d ago
The outer boundary is the point where a photon has a ~50% chance of escaping without encountering another particle.
3.
by antognini 2mo ago
We have constraints that primordial black holes must be less than the size of a large asteroid. They would be gravitationally insignificant to the Earth unless they actually passed through it. I also don't think it would really be dete
4.
by antognini 2mo ago
They did some modeling in a previous paper of how this would impact Ia supernovae and it depends on whether the supernova is driven by Kelvin-Helmholtz instabilities or not. In the case that it is, this would only trigger Ia supernovae for
5.
by antognini 2mo ago
To paraphrase the old joke, if you wake up with a $78,000 AWS bill, you have a problem. If you wake up with a $78 million AWS bill, Amazon has a problem.
6.
by antognini 5mo ago
We already know that some particles interact extremely weakly with others. Neutrinos were postulated as a "dark" particle in order to preserve conservation of energy and momentum, but it took more than a decade before they were ob
7.
by antognini 5mo ago
This is the field of information geometry: https://en.wikipedia.org/wiki/Information_geometry
8.
by antognini 7mo ago
In a similar vein I highly recommend Behind the Curve, which is a documentary about the flat Earth movement. It was a pretty fair film and tried to get to know the people involved in the movement and what it was that motivated them. It was
9.
by antognini 7mo ago
Did Moltbook even have any investors?
10.
Sally, by Isaac Asimov (1953)(lecturia.org)
2 points by antognini 7mo ago|0 comments
11.
by antognini 7mo ago
I think the long term impact of this will be to strengthen the importance of social ties in academic publishing. As it is there are so many papers published in many fields that people tend to filter for papers published by big names and ma
12.
by antognini 8mo ago
I remember one of my friends in college pointing out before lecture that the professor would always start by saying "OK, So."
13.
by antognini 9mo ago
You would basically want to calculate the solar altitude angle (or, equivalently the zenith angle): https://en.wikipedia.org/wiki/Solar_zenith_angle Given the mountains, the sun would appear to set when it descends bel
14.
by antognini 9mo ago
Thank you for the kind words! Yes, I think you're right about the missing factor of rho. And rho^2 is being drawn from a chi-squared distribution, not a chi distribution. (But the mode I stated is correct for a chi-squared distribut
15.
Learning to Play Tic-Tac-Toe with Jax(joe-antognini.github.io)
51 points by antognini 9mo ago|7 comments
16.
The Stars of Bethlehem(songofurania.com)
3 points by antognini 9mo ago|0 comments
17.
by antognini 9mo ago
I've found that there can be a lot of randomness for what makes the front page. Not too many people read the "New" page and articles drop off it pretty quickly, so it can be hard for a niche article to attract the handful of
18.
by antognini 9mo ago
Mark-to-market can create liquidity crises when coupled with capitalization requirements, though. This can happen in, e.g., bond markets. Say a bank is sitting on a pile of very safe bonds. If the interest rate suddenly increases, the mar
19.
by antognini 9mo ago
This article probably omitted it for simplicity, but you would discount the income stream over time. Projected income at the 20 year mark is valued much less than income next year. That helps to account for the uncertainty.
20.
by antognini 9mo ago
How would this help? If the existing operators refuse to lower rents and leave their spaces vacant then under this scheme no one else can build new spaces which rent at lower rates. You would just be stuck with vacant properties at above-
21.
by antognini 10mo ago
You don't need a full fledged theory of quantum gravity to describe Hawking radiation. Quantization of the gravitational field isn't relevant for that phenomenon. Similarly you don't need quantum gravity to describe large e
22.
by antognini 10mo ago
You may have seen diagrams of the tidal force of the Moon on the earth (like this one: https://www.oc.nps.edu/nom/day1/tide_force_diagram.gif ). Intuitively you would think that the tide is being formed because the
23.
Thought experiments on the computational theory of consciousness(joe-antognini.github.io)
4 points by antognini 10mo ago|0 comments
24.
by antognini 10mo ago
It's kind of interesting to compare this to Ptolemy's eras. In the Tetrabiblios, Ptolemy argued that man went through seven ages in his life, each associated with a different celestial object. 1. Infancy --- The Moon. Since the
25.
by antognini 11mo ago
Later on it looks like he classifies him as a "vanity angel" rather than a "strategic angel." It sounds like it can be useful to have someone with name recognition as an investor when you're talking to people who a
26.
by antognini 11mo ago
It's true that it leaves open the possibility of a conserved quantity that is not associated with a symmetry. But the kinds of conservation laws we are thinking about, like conservation of energy, do originate from a symmetry. So if
27.
by antognini 11mo ago
Noether's theorem tells us when we would expect conservation laws to hold and when we would expect them to fail. In the case of global energy conservation, there would have to be a global time invariance associated with the spacetime.
28.
by antognini 11mo ago
Taylor & Wheeler's Spacetime Physics is similar. They emphasize the importance of frame invariant representations. (I highly recommend the first edition over the second edition, the second edition was a massive downgrade.) Kip Th
29.
by antognini 11mo ago
It's hard to prove rigorously which is why people usually refer to it as the "manifold hypothesis." But it is reasonable to suppose that (most) data does live on a manifold in the strict sense of the term. If you imagine th
30.
by antognini 11mo ago
The collapse of classical Maya civilization predated the arrival of the Spanish by around six centuries.

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