Category
page 1No-go theorems
Bell's theorem
in quantum physics, the theorem that locally causal hidden-variable theories cannot reproduce correlations predicted by quantum mechanics
Earnshaw's theorem
Mathematical demonstration applied in electro-magnetism
no-cloning theorem
in quantum information theory, the statement that it is impossible to create an independent and identical copy of an arbitrary unknown quantum state
no-go theorem
theorem that states that a particular situation is not physically possible
Mermin–Wagner theorem
theorem about the impossibility of spontaneous symmetry breaking in two-dimensional systems at finite temperature
no-communication theorem
no-go theorem in quantum information theory, forbidding some communication during measurement of entangled states
quantum no-deleting theorem
in quantum information theory, the no-go theorem that, given two copies of a quantum state, one cannot delete only one of the copies
Kochen–Specker theorem
theorem that any hidden-variable theory describing quantum mechanics must be contextual
Coleman–Mandula theorem
theorem that spacetime symmetries cannot mix with internal ones in a relativistic quantum field theory
Haag–Lopuszanski–Sohnius theorem
supersymmetric generalization of Coleman–Mandula theorem: the only possible (super-)symmetries of a nontrivial 4d Lorentzian QFT are (super-)Poincaré symmetry and internal symmetries
Weinberg–Witten theorem
constraints on possible particle properties