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Merry Christmas. Buon Natale. Feliz Navidad. Joyeux Noel. ...and stay safe ...

AFAIK that’s why. If the only channel is gravitational radiation, then the dissipation is very, very weak. All collisions would be basically elastic.

That's wonderful, as long as the styles that prefer lavish illustration and marginalia on fat glossy paper all have affluent parents who can fork out $50-100 per, and drive them to school. These books are lovely to look at, but they'd be difficult for a poor family to buy and the student to carry back and forth to school on foot and the bus. Once you get to college or university, the prices and heft become truly crippling. https://www.wiley.com/en-ca/General+%26+Introductory+Chemical+Engineering-c-CG00

I still think there are other viable possibilities besides the ones mentioned. I mentioned briefly on another thread the idea that there might be emergent dynamics at play for gravitational systems with large numbers of constituents; these wouldn’t show up in calculations unless one actually derived an exact numerical solution for a discrete system (n-body with large n) rather than a continuum simplification. Unfortunately we don’t have the computational power to do this, not even in principle. In this picture, DM would be an artefact of our own computational limitations, and not any kind of new physics - the discrepancy that leads us to postulate DM would arise because we don’t have the means to use GR correctly for this scenario. After all, the universe is under no obligation to be computable (given current computational power), even if we do know all relevant laws of nature. There are similar problems in QCD as well.

I was always partial to "My favourite Bathtime Gurgles".

A book traps idea's, If there's only one copy... 😉