General Relativity2026-06-271 minarXiv:2606.28956expressVacuum by the BookA ball sits in a pit. It won't roll out on its own: it needs a push. But in the quantum world, a particle can leak through a barrier without extra energy. This trick is called tunneling.Vincenzo Branchina·Salvatore Capozziello·Filippo Contino·Carmen Ferraratunnel effectequivalence principleGeorge GamowLeo EsakiAlbert Einsteinquantum tunnelinginstantonquantum gravitygravitational singularityturbulence👍👎☆SimplePopularAdvanced