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Bending of light in quantum gravity.
N E J Bjerrum-Bohr1, John F Donoghue2, Barry R Holstein2
1Niels Bohr International Academy and Discovery Center, The Niels Bohr Institute, Blegdamsvej 17, DK-2100 Copenhagen Ø, Denmark.
Physical Review Letters
|February 28, 2015
Summary
We calculated quantum gravitational effects on light bending around massive objects like the Sun. This reveals new insights into gravity and the equivalence principle.
Area of Science:
- Gravitational physics
- Quantum field theory
- General relativity
Background:
- Understanding light bending is crucial for testing gravitational theories.
- Previous calculations often neglected quantum gravitational effects.
Purpose of the Study:
- To compute quantum gravitational corrections to light scattering.
- To investigate the implications for the equivalence principle.
Main Methods:
- Treating general relativity as an effective field theory.
- Calculating one-loop gravitational amplitudes for massless scalar/photon scattering.
- Semiclassical computation of the bending angle.
Main Results:
- Identified nonanalytic components of gravitational amplitudes.
- Included long-range quantum (ℏ) contributions to light bending.
- Derived a semiclassical bending angle for light grazing massive objects.
Conclusions:
- Quantum gravity modifies light bending predictions.
- Results challenge classical formulations of the equivalence principle.
- Provides a framework for studying quantum effects in strong gravitational fields.
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