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“On the Necessity of Quantized Gravity:
a critical comparison of Baym & Ozawa (2009) and Belenchia et al. (2018)"
Thursday, 03 June 2021
Video-Recording for any system with MP4-support
- Video.mp4 (ca. 195 Mb)
- Video_with_eng_sub.mp4 (ca. 194 Mb)
13:10 – 13:55
One of the main unsolved problems in theoretical physics is combining quantum
mechanics and general relativity. A central question is how to describe gravity
as a quantum field, or if a quantum field description of gravity is even necessary.
Baym and Ozawa in their paper "Two-slit diffraction with highly charged
particles: Niels Bohr’s consistency argument that the electromagnetic field
must be quantized" (PNAS, 106:3035–3040 (2009)) presented a thereto
unpublished argument by Bohr, and considered towards the end this question
for the gravitational field. Belenchia at al in their paper
"Quantum superposition of massive objects and the quantization of gravity"
(Physical Review D 98:1–9 (2018)) come to a different conclusion.
In this talk these two Gedankenexperiments will be analyzed, compared, and
combined. Assuming the Planck length as a fundamental lower bound on
distance measurability, it is found that a quantum field theory of gravity is not
a logical necessity from these types of considerations, in agreement with
Baym and Ozawa.
This is joint work with with E Aurell and I Pikovski.
Speaker today: Erik Rydving (KTH Engineering Physics Program)
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