Quantum Physics

An international team has initiated the MACE experiment to detect a rare transformation of muonium into its antimatter counterpart, antimuonium. This process, if observed, would challenge the Standard Model of particle physics by violating lepton flavor conservation. The project aims to vastly improve upon previous searches conducted over two decades ago.

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Physicists have demonstrated that the wave function describing the entire universe's quantum state cannot be determined through any experiment, even from a limited set of possibilities. Researchers Eddy Keming Chen and Roderich Tumulka argue this reveals a fundamental limit in quantum physics. Their work challenges assumptions about empirical knowledge in cosmology.

A team led by Holger Hofmann at Hiroshima University reported in May that a modified double-slit experiment showed single photons behaving as if in two places at once, potentially undermining the multiverse concept. The findings, which suggest the wave function guides real particle paths, have faced significant skepticism from other physicists. Despite pushback, the researchers stand by their results and continue their work.

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Physicists from the KATRIN collaboration have reported no evidence for a sterile neutrino in a precise analysis of tritium decay data. The findings, published in Nature, contradict earlier experimental claims and strengthen the case against a fourth neutrino type. The experiment, based in Germany, continues to gather more data for further tests.