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eugenrau

23 Apr 2017 21:47



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masa cauzeaza deformarea continuuMUL spatiu-timp care la randul sau cauzeaza gravitatia?am inteles bine?
Why does a mass produce gravity?                                                                 https://www.google.ro/url?sa=t&rct=j&q=&esrc=s&source=web&cd=3&cad=rja&uact=8&ved=0ahUKEwj65b7EnLvTAhVmCsAKHfI_D6MQFggzMAI&url=https%3A%2F%2Fwww.researchgate.net%2Fpost%2FWhy_does_a_mass_produce_gravity&usg=AFQjCNGW14r8DJgC04dJML4CgKxd-t--5w&sig2=W3BP7sd0CXEPc18WUp68LA
In the standard classical field theory (that is, Einstein's) there exists an interaction between mass-energy and the geometry of spacetime. The existence of this interaction is not so much explained as it is postulated. As a result of this interaction, the presence of mass-energy affects the geometry of spacetime, which in turn affects the trajectories of matter. This is what we experience as gravity.

The situation is fundamentally the same in quantum field theory. Of course we don't have a quantum theory of gravity, so we don't know for sure how it would work in detail.

I pedantically used the phrase "mass-energy" above for a reason. The Higgs mechanism is responsible for the rest masses of elementary particles, NOT the total measured mass of composite particles. For instance, most of the measured mass of a proton or a neutron comes from the binding energy of the constituent quarks, not the quark rest masses. So even if the quarks themselves were massless (no Higgs mechanism) the measured mass of the proton would not be that much different from what we actually observe. And insofar as gravity is  

Why does a mass produce gravity?. Available from: https://www.researchgate.net/post/Why_does_a_mass_produce_gravity [accessed Apr 23, 2017].