raattgift

6 ms·

1.
by raattgift 12d ago
Additionally, > light never changes is wrong. A photon has a momentum, which can increase or decrease as it travels through free space. Using general relativity, it's straightforward to define an affine time on a null geodesic (eve
2.
by raattgift 18d ago
Also > it really got me to think about this stuff. Thank you, that is very generous of you to say.
3.
by raattgift 18d ago
No paper is guaranteed to be completely accurate and correct at the time of publication; the remedy for honest errors is follow-on papers by the original authors or others in the field putting their names to formalized counter-arguments. Th
4.
by raattgift 19d ago
> It's not science until it passes peer review Peer reviewers don't generally reproduce the work in the publications they are asked to review, at least not during the review process itself. Neither do journal editors. If you w
5.
by raattgift 23d ago
Investor interest, but not the excess above principal sum kind of interest, and not investors' interest s .
6.
by raattgift 1mo ago
Not sure what level of answer you want here. I don't think there's a good slogan that you could memorize and repeat like "the night sky is black because Olber's 'paradox' is badly formulated in that the univers
7.
by raattgift 1mo ago
Yes, during cosmic inflation for example: two test objects initially close can end up many light-years apart. If we make these test objects null (i.e., lightlike) then we can always contrive an inflation that stretches them apart in such
8.
Black hole singularity is a surface not a point(arxiv.org)
300 points by raattgift 1mo ago|223 comments
9.
by raattgift 1mo ago
The problem is in allowing perturbations around effective w_{DE}=-1. The "phantom divide crossing" is the evolution of dark energy's effEOS across w = -1, the boundary between a quintessence regime (w > -1) and a phantom
10.
Neutron stars: smoother than billiard balls – unfortunately(ligo.org)
8 points by raattgift 1mo ago|1 comments
11.
by raattgift 3mo ago
Maybe you want to leaf through a copy of Birrell & Davies or Parker & Toms again. QFTCS is good in strong gravity, and is as good as anything else at transplanckian scale (which is to say there's presently no way of knowing wh
12.
Relativity for Retired Engineers(arxiv.org)
4 points by raattgift 3mo ago|1 comments
13.
Elon Musk's Sci-Fi Hyperloop Failed(washingtonian.com)
11 points by raattgift 7mo ago|1 comments
14.
by raattgift 8mo ago
In a terminal window run log stream --predicate 'subsystem == "com.apple.TimeMachine" AND NOT (category == "LogLimits" OR category == "VolumeViewModel")' --info --debug --style compact and then
15.
by raattgift 8mo ago
Indy led Belloq to the Ark. Belloq was looking in the wrong place because he only had the side of the headpiece of the Staff of Ra that was seared into Toht's palm, thus without Jones in the movie, the Nazis might never have acquired
16.
Best and worst parcel firms for customer satisfaction (UK) (2025)(ofcom.org.uk)
1 points by raattgift 8mo ago|1 comments
17.
A Jumble of Exotic Stars(eso.org)
2 points by raattgift 8mo ago|0 comments
18.
U.S. Customs and Border Protection Agency Information Collection Activities [pdf](public-inspection.federalregister.gov)
2 points by raattgift 10mo ago|1 comments
19.
by raattgift 11mo ago
Cool, so the European Union and overlapping institutions could see this as an opportunity to promote greater public knowledge about one of their respective member states. Seems like an argument in favour of encouraging the display of a mem
20.
by raattgift 11mo ago
That said, whenever there is a language selection UI (e.g. at banking machines or institutional websites) in wider Europe that uses flags to represent languages -- probably not a good idea to start with, but very common -- the Irish tricolo
21.
Ten Years Later, LIGO Is a Black-Hole Hunting Machine(caltech.edu)
3 points by raattgift 1y ago|0 comments
22.
Photon surfaces extensions for dynamical gravitational collapse(arxiv.org)
2 points by raattgift 1y ago|0 comments
23.
by raattgift 1y ago
Several of her first-or-sole-author minimal length quantum gravity phenomenology papers have more than a hundred citations: https://scholar.google.com/citations?user=NaQZcyYAAAAJ&hl=en and if nothing else, that's s
24.
by raattgift 1y ago
No, not really. To boil it down to thinner text, and to focus on your "Space becomes timelike", I think you are stuck on (a) a particular system of coordinates that (b) are not regular across the horizon and (c) thinking that eit
25.
Tesla Diner Drops Most Menu Options and Cuts Hours Just Weeks After Opening(jalopnik.com)
18 points by raattgift 1y ago|16 comments
26.
by raattgift 1y ago
> Space becomes timelike. There is only forward ... No. It's a fanciful analogy on a particular family of coordinate charts, particuarly systems of coordinates which do not smoothly/regularly cross the horizon. The black hole
27.
by raattgift 1y ago
The relevant quantities are the curvature scalars near the horizon, and for a sizable black hole they are small there. As an example, consider the Kretschmann scalar (KS). The KS is the sum of the squares of all components of a tensor. In
28.
Covariant, Gauge-Invariant Metric-Based Gravitational-Waves in Numer. Relativity(arxiv.org)
1 points by raattgift 1y ago|1 comments
29.
Igor and Grichka Bogdanoff(en.wikipedia.org)
2 points by raattgift 1y ago|1 comments
30.
A SUPER supermassive black hole(badastronomy.beehiiv.com)
3 points by raattgift 1y ago|0 comments

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