SQG6 - Quantum Gravity Phenomenology |
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Speaker |
Subramaniam, Shankaranarayanan |
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Co-autors |
Dawood Kothawala, L. Sriramkumar |
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Talk Title |
Quantum gravitational corrections to the propagator in spacetimes with constant curvature |
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Abstract |
The existence of a minimal and fundamental length scale, say, the Planck length, is a characteristic feature of almost all the models of quantum gravity. The presence of the fundamental length often leads to the improved ultra-violet behavior of the semi-classical propagators. The hypothesis of path integral duality provides a prescription to evaluate the modified propagator of a free, quantum scalar field in a given spacetime, taking into account the existence of the fundamental length in a locally Lorentz invariant manner. We use this prescription to compute the quantum gravitational modifications to the propagators in spacetimes with constant curvature, and show that: (i) the modified propagators are ultra-violet finite, and (ii) the modifications are non-perturbative in the Planck length. We discuss the implications of our results. |
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