dsqrt

7 ms·

31.
by dsqrt 10y ago
The energy requirements are proportional to the beaming angle, so if we assume FRBs to be beamed, then the energy required decreases significantly. For example assuming a beam of 10 deg^2, this would give a reduction of a factor 648.
32.
by dsqrt 10y ago
This article makes a number of incorrect statements. First of all, all observed FRBs so far are at cosmological distances, well outside the Milky Way. Second, even before the discovery of a repeating source, neutron star collisions have alr
33.
by dsqrt 10y ago
Something to keep in mind is that gravitational waves are linearized solutions to Einstein equations. That is, they can only be meaningfully defined far away from those sources. What happens close to the black holes cannot be described in t
34.
by dsqrt 10y ago
Actually the nice thing about gravitational waves is that we are sensitive to their amplitude, which scales as 1/r, and not to their energy, which scales as 1/r^2.
35.
by dsqrt 10y ago
Gamma-ray bursts emission is strongly beamed into a small solid angle. So, although their equivalent isotropic energies (that is the energy that would be needed to power gamma-ray bursts if the emission was isotropic) are huge, the actual e
36.
by dsqrt 10y ago
I wouldn't say that traditional journals in my field are biased in favor of top U.S. research institutions. The bias comes from the readers. Someone reading articles that are not directly connected with their research has a hard time j
37.
by dsqrt 10y ago
Just immagine having to scan through 100 articles every day looking for new ideas. You find something that sounds interesting from somebody you do not know personally (happens to me all the time). The topic is of your interest, but you are
38.
by dsqrt 10y ago
As somebody in the academia, I would see comments as potentially very dangerous. A comment system could be very easily abused by established researchers in some areas to prevent others from entering their niche sub-field. Do not get me wron
39.
by dsqrt 12y ago
I am not an expert, but my understanding is that long GRBs are expected as the result of the collapse of very massive stars. These stars are short lived (few million years) and very luminous. Metals (in astrophysics anything heavier than He
40.
by dsqrt 12y ago
I have the same machine as the author of this post and I have been wondering about installing Linux on it for quite some time. I was wondering: wouldn't it be simpler to use virtualization (no problems with the hardware, ease in sharin