Foundations of Physics 45 (3):279-294 (2015)

Abstract
It is widely hoped that quantum gravity will shed light on the question of the origin of time in physics. The currently dominant approaches to a candidate quantum theory of gravity have naturally evolved from general relativity, on the one hand, and from particle physics, on the other hand. A third important branch of twentieth century ‘fundamental’ physics, condensed-matter physics, also offers an interesting perspective on quantum gravity, and thereby on the problem of time. The bottomline might sound disappointing: to understand the origin of time, much more experimental input is needed than what is available today. Moreover it is far from obvious that we will ever find out the true origin of physical time, even if we become able to directly probe physics at the Planck scale. But we might learn some interesting lessons about time and the structure of our universe in the process. A first lesson is that there are probably several characteristic scales associated with “quantum gravity” effects, rather than the single Planck scale usually considered. These can differ by several orders of magnitude, and thereby conspire to hide certain effects expected from quantum gravity, rendering them undetectable even with Planck-scale experiments. A more tentative conclusion is that the hierarchy between general relativity, special relativity and Newtonian physics, usually taken for granted, might have to be interpreted with caution
Keywords Emergent gravity  Time  Analogue gravity  Condensed matter physics  Quantum gravity
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DOI 10.1007/s10701-014-9864-3
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A Real Lorentz-FitzGerald Contraction.Carlos Barceló & Gil Jannes - 2008 - Foundations of Physics 38 (2):191-199.
Challenges for Emergent Gravity.Steven Carlip - 2012 - Studies in History and Philosophy of Science Part B: Studies in History and Philosophy of Modern Physics 46 (2):200-208.
Quantum Non-Gravity and Stellar Collapse.C. Barceló, L. J. Garay & G. Jannes - 2011 - Foundations of Physics 41 (9):1532-1541.

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