3 ms·

> We are approaching lab-testability, with results from sensitive accelerometers allowed to point at tiny superposed masses. Do you happen to know of any prom

> We are approaching lab-testability, with results from sensitive accelerometers allowed to point at tiny superposed masses. Do you happen to know of any promising upcoming experiments in particular? Or any groups who are at the forefront of such research endeavors?

raattgift 3y ago
I can't say anything about promising. The hard part seems to be building an apparatus that works, and I don't know how to do that. I hear of short-lived superpositions with increasing amus or daltons but I can't deal with those units without the newest SI prefixes (fun facts, 666 Yamu is a bit more than 1 kg; and there is maybe about 0.666 YMsun locked up in observable galaxy clusters). HN user ISL <https://news.ycombinator.com/user?id=ISL https://news.ycombinator.com/user?id=ISL> is probably au fait with recent quantum gravimetry experiments. The Müller group at UC Berkeley came to my mind. They did a recent paper <https://arxiv.org/abs/2210.07289 https://arxiv.org/abs/2210.07289>. Gavin Morley's group at Warwick University is doing work in the area <https://warwick.ac.uk/fac/sci/physics/staff/academic/gmorley/levitated https://warwick.ac.uk/fac/sci/physics/staff/academic/gmorley...>. He has what looks like a useful bibliography on the subject too: <https://warwick.ac.uk/fac/sci/physics/staff/academic/gmorley/teaching/morley_reference_list_lectures_1-3.pdf https://warwick.ac.uk/fac/sci/physics/staff/academic/gmorley...>. Finally, while not really related to your question (except that greater-precision gravimetry is likely to mean smaller superposed masses are useful), https://www.nature.com/articles/s41586-021-04315-3 https://www.nature.com/articles/s41586-021-04315-3 is extremely cool, and I wish it could be sent back into the heyday of https://en.wikipedia.org/wiki/Time_Team https://en.wikipedia.org/wiki/Time_Team . (ETA: Müller's group, similarly, https://arxiv.org/abs/1904.09084 https://arxiv.org/abs/1904.09084 .)
- codethief 3y ago
  Thanks so much!

raattgift 3y ago

I can't say anything about promising. The hard part seems to be building an apparatus that works, and I don't know how to do that. I hear of short-lived superpositions with increasing amus or daltons but I can't deal with those units without the newest SI prefixes (fun facts, 666 Yamu is a bit more than 1 kg; and there is maybe about 0.666 YMsun locked up in observable galaxy clusters). HN user ISL <https://news.ycombinator.com/user?id=ISL https://news.ycombinator.com/user?id=ISL> is probably au fait with recent quantum gravimetry experiments. The Müller group at UC Berkeley came to my mind. They did a recent paper <https://arxiv.org/abs/2210.07289 https://arxiv.org/abs/2210.07289>. Gavin Morley's group at Warwick University is doing work in the area <https://warwick.ac.uk/fac/sci/physics/staff/academic/gmorley/levitated https://warwick.ac.uk/fac/sci/physics/staff/academic/gmorley...>. He has what looks like a useful bibliography on the subject too: <https://warwick.ac.uk/fac/sci/physics/staff/academic/gmorley/teaching/morley_reference_list_lectures_1-3.pdf https://warwick.ac.uk/fac/sci/physics/staff/academic/gmorley...>. Finally, while not really related to your question (except that greater-precision gravimetry is likely to mean smaller superposed masses are useful), https://www.nature.com/articles/s41586-021-04315-3 https://www.nature.com/articles/s41586-021-04315-3 is extremely cool, and I wish it could be sent back into the heyday of https://en.wikipedia.org/wiki/Time_Team https://en.wikipedia.org/wiki/Time_Team . (ETA: Müller's group, similarly, https://arxiv.org/abs/1904.09084 https://arxiv.org/abs/1904.09084 .)

codethief 3y ago
Thanks so much!