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"Doubly-special relativity" (DSR), the idea of a Planck-scale Minkowski limitthat is still a relativistic theory, but with both the Planck scale and thespeed-of-light scale as nontrivial relativistic invariants, was proposed(gr-qc/0012051) as a physics intuition for several scenarios which may arise inthe study of the quantum-gravity problem, but most DSR studies focusedexclusively on the search of formalisms for the description of a specificexample of such a Minkowski limit. A novel contribution to the DSR physicsintuition came from a recent paper by Smolin (hep-th/0501091) suggesting thatthe emergence of the Planck scale as a second nontrivial relativistic invariantmight be inevitable in quantum gravity, relying only on some rather robustexpectations concerning the semiclassical approximation of quantum gravity. Ihere attempt to strengthen Smolin's argument by observing that an analysis ofsome independently-proposed Planck-scale particle-localization limits, such asthe "Generalized Uncertainty Principle" often attributed to string theory inthe literature, also suggests that the emergence of a DSR Minkowski limit mightbe inevitable. I discuss a possible link between this observation and recentresults on logarithmic corrections to the entropy-area black-hole formula, andI observe that both the analysis here reported and Smolin's analysis appear tosuggest that the examples of DSR Minkowski limits for which a formalism hasbeen sought in the literature might not be sufficiently general. I also stressthat, as we now contemplate the hypothesis of a DSR Minkowski limit, there isan additional challenge for those in the quantum-gravity community attributingto the Planck length the role of "fundamental length scale".Comment: 12 pages, LaTe

BUILDING A CASE FOR A PLANCK-SCALE-DEFORMED BOOST ACTION: THE PLANCK-SCALE PARTICLE-LOCALIZATION LIMIT