https://doi.org/10.1140/epjc/s10052-022-10516-5
Regular Article - Theoretical Physics
Fundamental length scale and the bending of light in a gravitational field
1
Beyond Center, Arizona State University, 85287, Tempe, AZ, USA
2
Department of Informatics, University of Sussex, BN1 9RH, Falmer, Sussex, UK
3
Department of Physics, Nazarbayev University, Kabanbay Batyr Ave 53, 010000, Nur-Sultan, Kazakhstan
4
Fesenkov Astrophysical Institute, 050020, Almaty, Kazakhstan
Received:
25
May
2022
Accepted:
12
June
2022
Published online:
29
June
2022
The canonical approach to quantizing quantum gravity is understood to suffer from pathological non-renomalizability. Nevertheless in the context of effective field theory, a viable perturbative approach to calculating elementary processes is possible. Some non-perturbative approaches, most notably loop quantum gravity and combinatorial quantum gravity imply the existence of a minimal length. To circumvent the seeming contradiction between the existence of a minimum length and the principle of special relativity, Double Special Relativity introduces modified dispersion relationships that reconcile the conflict. In this work, we combine these dispersion relationships with an effective field theory approach to compute the first post Newtonian correction to the bending of light by a massive object. The calculation offers the prospect of a directly measurable effect that rests upon both the existence of a quantized gravitational field and a minimal length. Experimental verification would provide evidence of the existence of a quantum theory of gravity, and the fundamental quantization of spacetime with a bound on the minimal distance.
Philip Tee and Nosratollah Jafari contributed equally to this work.
© The Author(s) 2022
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