Yes I am aware of this study. From memory the temperature limit was 50K which no civilisation capable of building a Dyson Sphere would let leak out. Also the st

Yes I am aware of this study. From memory the temperature limit was 50K which no civilisation capable of building a Dyson Sphere would let leak out. Also the study was limited to our galaxy. The final issue is that if the von Neumann probes are moving at close to the speed of light we would not be able to detect these Dyson spheres anyway. It would be really interesting to do a survey of galaxies looking for these spherical chunks. It should be possible to just use existing data and some machine learning to scan for possible candidates. If anyone is interested in doing this with me my contact details are in my profile.