Dark matter detectors designed to spot hypothetical dark matter particles have instead detected a signal from neutrinos produced by the sun. This 'neutrino fog' is both a milestone and a sign that these detectors may soon be overwhelmed by neutrinos, hindering their ability to detect dark matter.
This article presents a white paper summarizing current knowledge on quantum gravity phenomenology and its multi-messenger signals. It provides an overview of the field, discusses experimental and observational signatures, and identifies key questions and challenges.
Astrophysicists have detected subtle hints that the mysterious 'dark energy' that drives the universe's expansion may be slightly weakening over time.
