Physical theory with matter as quantum fields but gravity as a classical field
Semiclassical gravity is an approximation to the theory of quantum gravity in which one treats matter and energy fields as being quantum and the gravitational field as being classical.
In semiclassical gravity, matter is represented by quantum matter fields that propagate according to the theory of quantum fields in curved spacetime. The spacetime in which the fields propagate is classical but dynamical. The dynamics of the theory is described by the semiclassical Einstein equations, which relate the curvature of the spacetime that is encoded by the Einstein tensor to the expectation value of the energy–momentum tensor (a quantum field theory operator) of the matter fields, i.e.
where G is the gravitational constant, and indicates the quantum state of the matter fields.
and 26 Related for: Semiclassical gravity information
Semiclassicalgravity is an approximation to the theory of quantum gravity in which one treats matter and energy fields as being quantum and the gravitational...
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system that would otherwise become a time machine. Some results in semiclassicalgravity appear to support the conjecture, including a calculation dealing...
mathematical physicist. Bill Unruh: physicist engaged in the study of semiclassicalgravity and responsible for the discovery of the so-called Unruh effect...
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holes should emit thermal radiation. Semiclassical calculations indicate that indeed they do, with the surface gravity playing the role of temperature in...
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difference of about 55 orders of magnitude. Some proposals involve modifying gravity to diverge from general relativity. These proposals face the hurdle that...
deviation from classical and semiclassicalgravity is needed only in the regime in which the effects of quantum gravity are expected to dominate. On the...
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semiclassicalgravity suggest that when quantum effects are incorporated into general relativity, these loopholes may be closed. These semiclassical arguments...
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Francisco D (1997). "Exact self-consistent gravitational shock wave in semiclassicalgravity". Physical Review D. 56 (6): 3471–3477. arXiv:gr-qc/9611009. Bibcode:1997PhRvD...
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physics, nuclear physics, optics, stochastic dynamics, astrophysics, quantum gravity, and cosmology. Supersymmetry has also been applied to high energy physics...
various Grand Unification Theories. Why is the fourth fundamental force (gravity) so many orders of magnitude weaker than the other three fundamental forces...
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