Minimal length in quantum gravity and the fate of Lorentz invariance

Studies in History and Philosophy of Science Part B: Studies in History and Philosophy of Modern Physics 40 (3):259-267 (2009)
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Loop quantum gravity predicts that spatial geometry is fundamentally discrete. Whether this discreteness entails a departure from exact Lorentz symmetry is a matter of dispute that has generated an interesting methodological dilemma. On one hand one would like the theory to agree with current experiments, but, so far, tests in the highest energies we can manage show no such sign of departure. On the other hand one would like the theory to yield testable predictions, and deformations of exact Lorentz symmetry in certain yet– to–be–tested regimes may have phenomenological consequences. Exposing their shortcomings, here I discuss two arguments that exemplify this dilemma, and compare them to other cases from the history of physics that share their symptoms.



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Amit Hagar
Indiana University, Bloomington

Citations of this work

The Primacy of Geometry.Meir Hemmo & Amit Hagar - 2013 - Studies in the History and Philosophy of Modern Physics 44 (3):357-364.
Quantum gravity.Steven Weinstein - 2008 - Stanford Encyclopedia of Philosophy.
Squaring the Circle: Gleb Wataghin and the Prehistory of Quantum Gravity.Amit Hagar - 2014 - Studies in the History and the Philosophy of Modern Physics 46 (2):217-227.

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References found in this work

Quantum Gravity.Carlo Rovelli - 2007 - Cambridge University Press.
The Character of Physical Law.Alex C. Michalos - 1967 - Philosophy of Science 34 (2):194-194.

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