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 post is dedicated to dark energy in the context of (not solving) the Hubble tension, the possibility that the NANOGrav pulsar timing array may have detected non-tensorial gravitational wave polarizations, and the construction of a general covariant action for the so-called holographic dark energy model. Enjoy the read and have a nice weekend!
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!
