# No-go theorem

In theoretical physics, a no-go theorem is a theorem that states that a particular situation is not physically possible. Specifically, the term describes results in quantum mechanics like Bell's theorem and the Kochen–Specker theorem that constrain the permissible types of hidden variable theories which try to explain the apparent randomness of quantum mechanics as a deterministic model featuring hidden states.[1][2][failed verificationsee discussion]

## Instances of no-go theorems

Full descriptions of the no-go theorems named below are given in other articles linked to their names. A few of them are broad, general categories under which several theorems fall. Other names are broad and general-sounding but only refer to a single theorem.

It is usually interpreted to mean that the graviton (${\displaystyle \;J=2\;}$) in a relativistic quantum field theory cannot be a composite particle.

## References

1. ^ Bub, Jeffrey (1999). Interpreting the Quantum World (revised paperback ed.). Cambridge University Press. ISBN 978-0-521-65386-2.
2. ^ Holevo, Alexander (2011). Probabilistic and Statistical Aspects of Quantum Theory (2nd English ed.). Pisa: Edizioni della Normale. ISBN 978-8876423758.
3. ^ Cowling, T.G. (1934). "The magnetic field of sunspots". Monthly Notices of the Royal Astronomical Society. 94: 39–48. Bibcode:1933MNRAS..94...39C. doi:10.1093/mnras/94.1.39.
4. ^ Haag, Rudolf (1955). "On quantum field theories" (PDF). Matematisk-fysiske Meddelelser. 29: 12.
5. ^ Nielsen, M.A.; Chuang, Isaac L. (1997-07-14). "Programmable quantum gate arrays". Physical Review Letters. 79 (2): 321–324. arXiv:quant-ph/9703032. Bibcode:1997PhRvL..79..321N. doi:10.1103/PhysRevLett.79.321.