My thoughts on what the Hubble tension really is, based on George Efstathiou’s “To H0 or not to H0?“, arXiv:2103.08723.
Neutron star-black hole mergers
After a while that this subject hadn’t appeared in my blog, this week’s entry is entirely dedicated to the Hubble tension: a new observational update in light of Gaia DR3 parallaxes, an old model being killed, and prospects from future neutron star-black hole mergers. A heads-up that this will be the last entry for 2020, as I’m “going” on holidays. Stay tuned for next year’s entries, “see” you soon, Merry Christmas and Happy New Year!
In the fourth installment of my “Top arXiv papers of the week” column you can read about quantum foam, whether GW190425 is the first neutron star-black hole merger ever detected, the H0 tension and strong lensing time delays, how to efficiently parametrize the spacetime around black holes, and finally whether microlensing of quasars might point towards primordial black holes. Also, I will at least try to come up with a nice name for this blog before next week’s column!
