Found a way to determine the rate of expansion of the universe with a 2% error

In a recently published paper, a group of scientists proposed a simple and new method to reduce

Hubble constant measurements are accurate to 2% using data from a pair of merging neutron stars. 

According to Professor Calderon Bustillo, it is difficultinterpret how far these mergers are going. Therefore, the team proposed to study the secondary, much weaker components of the gravitational wave signals emitted by mergers of neutron stars, known as higher modes.

This works well in case of black mergingholes, since modern detectors can record this moment up to high modes. But in the case of neutron stars, the pitch of the merger signal is so high that detectors cannot detect it. 

In their study, the team conducted computersimulation of neutron star mergers.  By studying these models, the team determined that a detector like NEMO could measure the Hubble constant to within 2%.

One of the most striking implications of this study is that it can determine whether the universe is expanding uniformly in space, as currently assumed.

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