Global InformationPressuron information
| Composition | Elementary particle |
|---|---|
| Interactions |
|
| Status | Hypothetical |
| Theorized |
|
| Mass | ? |
| Electric charge | 0 |
| Spin | 0 |
The pressuron is a hypothetical scalar particle which couples to both gravity and matter theorised in 2013.[1] Although originally postulated without self-interaction potential, the pressuron is also a dark energy candidate when it has such a potential.[2] The pressuron takes its name from the fact that it decouples from matter in pressure-less regimes,[2] allowing the scalar–tensor theory of gravity involving it to pass solar system tests, as well as tests on the equivalence principle, even though it is fundamentally coupled to matter. Such a decoupling mechanism could explain why gravitation seems to be well described by general relativity at present epoch, while it could actually be more complex than that. Because of the way it couples to matter, the pressuron is a special case of the hypothetical string dilaton.[3] Therefore, it is one of the possible solutions to the present non-observation of various signals coming from massless or light scalar fields that are generically predicted in string theory.
- ^ a b Minazzoli, O.; Hees, A. (August 2013). "Intrinsic Solar System decoupling of a scalar–tensor theory with a universal coupling between the scalar field and the matter Lagrangian". Physical Review D. 88 (4): 041504. arXiv:1308.2770. Bibcode:2013PhRvD..88d1504M. doi:10.1103/PhysRevD.88.041504. S2CID 119153921.
- ^ a b Minazzoli, O.; Hees, A. (July 2014). "Late-time cosmology of a scalar–tensor theory with a universal multiplicative coupling between the scalar field and the matter Lagrangian". Physical Review D. 90 (2): 023017. arXiv:1404.4266. Bibcode:2014PhRvD..90b3017M. doi:10.1103/PhysRevD.90.023017. S2CID 119163327.
- ^ Damour, T.; Polyakov, A.M. (July 1994). "The string dilaton and a least coupling principle". Nuclear Physics B. 423 (2–3): 532–558. arXiv:hep-th/9401069. Bibcode:1994NuPhB.423..532D. doi:10.1016/0550-3213(94)90143-0. S2CID 16120767.