That's a good question. I don't know of any specifics, but I wouldn't be surprised if someone used capture of WIMPs in neutron stars to provide constraints on

That's a good question. I don't know of any specifics, but I wouldn't be surprised if someone used capture of WIMPs in neutron stars to provide constraints on the properties of wIMPs. I remember considering a project back when I was in grad school that would use Cepheid variables to provide constraints on the properties of axions. It seems plausible that you could do something similar for WIMPs and neutron stars.