Neutron Stars Could be the Best way to Measure Dark Energy - by BrianKoberlein
Dark energy is central to our modern theory of cosmology. We know the universe is expanding at an ever-increasing rate, and the clearest explanation is that. Since this energy doesn’t emit light, we call it dark energy. But simply giving dark energy a name doesn’t mean we fully understand it. We can see what dark energy does, but its fundamental nature is perhaps the biggest scientific mystery we have.
But while the cosmological constant matches observation really well, the idea is not without its problems. One problem that keeps showing up in the data is the fact that we can’t pin down its value. When we try to measure the constant using different methods, we get slightly different values.
That is unless you want an alternative to the cosmological constant. With an extra scalar field, all of a sudden you have a degree of freedom that could account for dark energy. Tweak your scalar field in the right way, and you can match the observations we have of dark energy. And since it’s a field rather than a constant, dark energy could vary in both space and time, which would explain why we can’t pin it down to a simple constant.
A scalar field enhances some gravitational wave modes for merging neutron stars. Credit: Bezares, et al
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