My thoughts on what the Hubble tension really is, based on George Efstathiou’s “To H0 or not to H0?“, arXiv:2103.08723.
This week’s installment covers a new Bayesian analysis code (particularly designed for cosmological studies!) called Cobaya, a gravitational wave constraint on the number π (yes, you’ve read correctly) as a null test of General Relativity, and a new proposal for holographic dark energy based on John Barrow’s recent COVID-19-inspired proposal for fractal structure on a black hole event horizon. Enjoy!
With a week of delay due to Italian bureaucracy-induced commitments, my Week 17 summaries are now out. There is a new entry in terms of topics covered, i.e. the thorny issue of naturalness in particle physics and cosmology (besides two papers covering limits on the duration of inflation, and independent inferences of the baryon energy density from Planck). As always, comments are very welcome!
