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- W3022664861 abstract "Each approach to the quantum-gravity problem originates from expertise in one or another area of theoretical physics. The particle-physics perspective encourages one to attempt to reproduce in quantum gravity as much as possible of the successes of the Standard Model of particle physics, and therefore, as done in String Theory, the core features of quantum gravity are described in terms of graviton-like exchange in a background classical spacetime. From the general-relativity perspective it is natural to renounce to any reference to a background spacetime, and to describe spacetime in a way that takes into account the in-principle limitations of measurements. The Loop Quantum Gravity approach and the approaches based on noncommutative geometry originate from this general-relativity perspective. The condensed-matter perspective, which has been adopted in a few recent quantumgravity proposals, naturally leads to scenarios in which some familiar properties of spacetime are only emergent, just like, for example, some emergent collective degrees of freedom are relevant to the description of certain physical systems only near a critical point. Both from the general-relativity perspective and from the condensed-matter perspective it is natural to explore the possibility that quantum gravity might have signicant implications for the fate of Lorentz symmetry in the Planckian regime. From the particle-physics perspective there is instead no obvious reason to renounce to exact Lorentz symmetry, although (spontaneous) Lorentz symmetry breaking is of course possible. A fastgrowing phenomenological programme looking for Planck-scale departures from Lorentz symmetry can contribute to this ongoing debate." @default.
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- W3022664861 date "2003-01-01" @default.
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- W3022664861 title "The Three perspectives on the quantum gravity problem and their implications for the fate of Lorentz symmetry" @default.
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