#133 Seven hints that early-time new physics alone is not sufficient to solve the Hubble tension
“Seven hints that early-time new physics alone is not sufficient to solve the Hubble tension” arXiv:2308.16628
“… a promising way forward should ultimately involve a combination of early- and late-time (but non-local – in a cosmological sense, i.e. at high redshift) new physics, as well as local (i.e. at $z∼0$ ) new physics”
“… we know that ΛCDM cannot be the end of the story: at best, it is a phenomenological placeholder for our ignorance about the fundamental nature of dark matter, dark energy, and the origin of primordial perturbations.”
$\mbox{ }$ An even more promising way forward should involve a single new physical phenomenon that works at any redshifts.
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