Here's an article describing the theory that sound waves have negative mass. It also describes it in terms of the behavior of fluids. https://www.realclearscie

Here's an article describing the theory that sound waves have negative mass. It also describes it in terms of the behavior of fluids. https://www.realclearscience.com/articles/2018/08/11/could_phonons_have_a_negative_mass_110719.html https://www.realclearscience.com/articles/2018/08/11/could_p... Maybe these phenomena are linked, and it's more immediate than cosmology. via: https://twitter.com/robinhanson https://twitter.com/robinhanson