14 ottobre 2012

Ma l'Universo esiste o è solo una simulazione?

Un gruppo di fisici dell'Università di Bonn sta cercando di rispondere all'antica domanda: l'Universo esiste davvero?
Lo studio, che consiste nel trovare dei limiti alle dimensioni e alla quantità di energia del mondo conosciuto, è disponibile nell'archivio arXiv.org
Constraints on the Universe as a Numerical Simulation
Silas R. Beane, Zohreh Davoudi, Martin J. Savage
(Submitted on 4 Oct 2012)
Observable consequences of the hypothesis that the observed universe is a numerical simulation performed on a cubic space-time lattice or grid are explored. The simulation scenario is first motivated by extrapolating current trends in computational resource requirements for lattice QCD into the future. Using the historical development of lattice gauge theory technology as a guide, we assume that our universe is an early numerical simulation with unimproved Wilson fermion discretization and investigate potentially-observable consequences. Among the observables that are considered are the muon g-2 and the current differences between determinations of alpha, but the most stringent bound on the inverse lattice spacing of the universe, b^(-1) >~ 10^(11) GeV, is derived from the high-energy cut off of the cosmic ray spectrum. The numerical simulation scenario could reveal itself in the distributions of the highest energy cosmic rays exhibiting a degree of rotational symmetry breaking that reflects the structure of the underlying lattice.

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