👉 Nonvacua is a concept in quantum mechanics that refers to a state of matter or system where no particles are present, meaning there exists no quantum fluctuations. Nonvacua states are often used to describe systems where the wavefunction collapses to zero eigenvalues and becomes an infinite string of zeros. This makes these states particularly interesting for studies in quantum mechanics because they can be used to model many physical phenomena that occur at extremely low temperatures or under extreme conditions, such as superconductivity.