The invisible celestial collisions to date may be the best choice for astronomers to determine the speed at which the universe expands.
Now, physicists have two ways to measure the rate of expansion, both of which are very precise – but their answers don’t match. This is frustrating because this number is called the Hubble constant and it provides calculations like the numbers scientists use to estimate the age of the universe.
This is why they are looking for a third way to determine it. A pair of scientists based in Massachusetts believes that this technique will allow people to see the violence of black holes and neutron stars colliding.
Massachusetts Institute of Technology physicist Salvatore Vitale said in a statement: “Black Hole – Neutron Star Binary is a very complex system, and we know very little about it.” “If we find one, then the reward is that they can do it for us.” The understanding of the universe makes a huge contribution.”
So far, scientists have not observed the collision of mixed pairs, only the collision of binary black holes and binary neutron stars. Most observations only include black holes, so gravitational waves can only be used to detect collisions. Astronomers know they need an optical signal to calculate the Hubble constant, which allows them to look for pairs of neutron stars or black holes – neutron stars.
However, when physicists tried to calculate the Hubble constant based on the data they collected during the August neutron star merger – this was the first observation – they were not confident about the results. That’s because the neutron star collision is a mess, and the material is emitted asymmetrically, making it difficult for scientists to figure out the distance traveled by the signal.
Switching one of these neutron stars to a black hole makes the chaos easier to manage, giving physicists the position needed to recalculate the Hubble constant. But scientists believe that these hybrid collisions are rare, so it is less common for Vital and his colleagues to check if the benefits of a more precise location outweigh the combined barriers.
The work was detailed in an article published in the Physical Review Letters magazine on July 12 and posted on the preprinted website arxiv.org.
According to their estimates, only one hybrid merger should allow physicists to efficiently calculate the Hubble constant, just like combining data from 50 different neutron star collisions.
Now all we have to do is waiting for a lucky strike.