Dark matter is my focus these days, but the intractable problems of dark energy and cosmic acceleration are still on my mind, says Chanda Prescod-Weinstein
Scientifically, it is a fair question, but I wondered whether the juxtaposition only existed in the reader’s mind because both contain the word “dark”. In some ways, that is pretty much“we as scientists can’t see it and don’t know what’s going on”.
The social studies side of my brain is interested in the way these names work, the way that scientists first clung to the name dark matter and then evidently adapted that when the cosmic acceleration problem came along. This curiosity maybe runs in parallel with that of the person who asked me why I spend so much time on one and not the other. Like I said, it is a good scientific question.
I’m not sure I have a good scientific answer. I do have a personal one, though. I came of age with the cosmic acceleration problem. As a teen, I cut out a figure from aarticle about the new discovery that space-time’s expansion is accelerating, and I glued it to my application to the California Institute of Technology. I wrote underneath: “I want to solve this problem.” Throughout the next 11 years or so, that is exactly what I tried to do.
This is probably also why I came to see dark energy as a kind of intractable problem for me to personally work towards solving. On the one hand, I have a gut feeling about how it fits in with other questions we have. On the other, there are physicists who believe that the rest of us are overthinking it. In their view, it is just a constant energy known as the cosmological constant, and the value of the cosmological constant is an accident.
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