Numerical simulation of a black hole-neutron star merger.
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- čas přidán 11. 07. 2022
- The left side of the simulation shows the density profile (blue and green contours) with the magnetic-field lines (pink curves) penetrating the black hole, unbound matter (white color) and its velocity (green arrows). The right side displays the magnetic-field strength (magenta) and magnetic-field lines (light-blue curves).
©K. Hayashi (Kyoto University) - Věda a technologie
The power of a black hole is impossible for me to grasp, but watching the ease with which it shreds a neutron star-- within just a few seconds!-- blows my mind. Incredible.
Actually, it's even quicker: It's just a fraction of a second, not a few seconds.
Incredible simulation!
nice work
Under the immense gravity, what would be the perceived time from the refence point of the neutron star?
Roughly speaking (and not taking into account typical rotations of neutron stars) time is slowed down on the surface of a neutron star by about ~20% compared to a distant observer.
Have you checked energy conservation?
Yes, during the simulation energy conservation was monitored. What was done was to monitor the ADM mass, the energy carried away by gravitational waves and neutrinos. Their sum should be constant. A deviation of not more than 0.1% was found.
Do time vibrate as a gravity wave pass earth?
If you close to a collision of two black holes. Do time vibrate as the gravity wave pass.
Is there any phenomenon that create a gravity wave so that time vibrate as the gravity wave pass?
In principle, it should be possible to detect gravitational waves also by looking at the temporal distortions. See for example www.smithsonianmag.com/science-nature/send-atomic-clocks-space-find-gravitational-waves-180954359/ for a popular science summary article. It's much easier (although difficult nonetheless) to look for their spatial distortions like what is done by interferometric detectors such as LIGO, Virgo, KAGRA, and GEO600.
milliseconds...
yes its a quasar
Is the component of the magnetic field that is parallel to the angular momentum vector of the black hole parallel or anti-parallel or can it be either. Do those vectors point in the same direction or opposite directions or either? Could you suggest any accessible reading that go over the basics of a black magnetic fields? Thanks.
The polarity of the magnetic field, which penetrates the black hole and creates the magnetosphere could be in either direction relative to the black hole spin. The stochastic process (the dynamo activity) in the accretion disk determines the eventual polarity of the magnetic field. The details of how this all works are quite complicated and are available mostly from (astro)physics text books. Our local experts recommends for example “MHD Flows in Compact Astrophysical Objects Accretion, Winds and Jets“ by Vasily S. Beskin.
What happens to the matter of the neutron star? It's now not in a very compact state anymore since the star has been ripped apart and therefore gravity is way less. Right? So does it reassembles back into "normal" matter?
Yes. Part of the expelled matter makes it into the interstellar gas and can become part of future stars and planets.
Matter bends spacetime, or is energy released (fast radio burst) when space time bends?
Yes.
I believe the time clock is shown for the observer's position. How far is the position of the observer from the black hole?
Let us just quote the expert's reply here almost verbatim: The clock shows the simulation time coordinate. Since in general relativity, you can choose the time slice freely, it was chosen such that the time proceeds slowly in the vicinity of the black hole, and it coincides with the time on the Earth at spatial infinity. In this sense, the clock in the animation is shown for the observer near the black hole. Our quoted expert is one of the authors of the paper.
Ansys
What software?
The code was developed by an international research team. Details are described in the publication and references therein. Free copy of the publication describing this simulation: arxiv.org/abs/2111.04621.
What are these, jets?
Correct, these are jets. You can read more about this video in our related press release from 2022 at www.aei.mpg.de/937377/from-i-for-inspiral-to-g-for-gamma-ray-burst.