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The graviton is a hypothetical Elementary particle which would transmit the revolved in the majority of the systems of quantum Gravité. It would be thus the Quantum gravitational force. In current language, one can say that revolve them are the messengers of gravity. The more there is in a gravitational field, the more this field is powerful.
In order to answer the characteristics of the gravitational interaction, let us revolve them must always lead to a gravitational interaction, to have an infinite range and to be of unlimited number. Quantiquement, that means that it is a Boson of null Masse and of Spin equal to 2. What implies that they are Luxon S, particles moving with the Speed of light.
Let us revolve were postulated following successes of the representation of the interactions within the framework of the quantum Mécanique in other fields. For example, the quantum electrodynamic very precisely explains the whole of the electromagnetism of the macroscopic field to the microscopic field by the exchange of Photon S between the electric charges. Thus, the exchanged photons are responsible for the electric and magnetic forces.
Being given the broad success of quantum mechanics for the description of the other interactions representing the fundamental forces of the Universe, it seemed natural that the same methods were to function for the description of the gravitation.
In spite of many attempts, the graviton is not even theoretically well encircled. To date, all the attempts to create a simple theory of the quantum Gravité failed. There remains still unobserved.
In Theory of the cords and Cosmology branaire, the graviton has an important place. As this one is generated by a closed Corde, it cannot be imprisoned in a D-brane. That implies that through the gravitational Force, the description of the existence of other D-branes becomes possible.
A fundamental difficulty for its description lies in the fact that the masses all are positive, that the effects are felt ad infinitum, without effect shielding: the interaction of hypothetical a graviton with an equipment intended to highlight it is likely to be drowned in an enormous background noise,… universal. The only way of detecting them would be to seek the events where the movement or the energy of a object-test changes differently from what is predicted by the General relativity, but one of the basic principles of the quantum Gravité would be that it allows itself to find the whole of the coherent experimental knowledges with general relativity.
It should besides be noted that within the framework of the General relativity (nonquantum) of Einstein the gravitational interaction does not have a fact the same statute as the three others forces. Indeed, it disappears in the curve from the Espace-temps: the masses do not attract each other any more, they follow the Géodésique S of a space time woven by the contents energy-impulse of the universe itself.
The graviton is also comparable to a gravitational Onde which could be detected by the Interféromètre VIRGO.
External bonds
- Forced experimental on the characteristics graviton (Particle Dated Group)
Simple: Graviton
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