Changes Everything: New Research Suggests That Gravity Can Exist Without. conclusion: Black Holes ( Even Dark Matter) are Massless.
(IMO, No dubble shell of Negative and positive mass =0 ) is needed., as Richard lieur ( Alabama uni) assumes. see: https://bigbang-entanglement.blogspot.com/2024/11/changes-everything-new-research.html
E-mail address: lieur@uah.edu
Below: the alternarive opposing dual Axion/ Graviton pressure Gravity