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 entry discusses two papers on shadows (one in relation to superradiance, and one in relation to naked singularities), and one paper addressing the important question of how model-independent BAO measurements are. Following the discussion of the third paper, I have included a long-ish bonus discussion on what my opinion is on this whole BAO model-independence business (some readers might find the discussion provocative, if so that was not my intention). Enjoy!
This week’s entry focuses on observational tests of a specific class of string inflationary models (which allow to set limits on the fundamental microscopic string parameters), observational tests of naked singularity spacetimes from their shadows and the continuum spectrum emitted from accretion disks, and finally a study addressing the interesting question of what was the maximum initial temperature of the Universe in the radiation domination epoch. Happy Easter to those readers who celebrate it!
