Seeing triple

• Autores: Matthew Chalmers
• Localización: New scientist, ISSN 0262-4079, Nº. 2936, 2013, págs. 34-37
• Idioma: inglés
• Texto completo no disponible (Saber más ...)
• Resumen

  • Chalmers examines the three dimensions of space. A theory of quantum gravity would unify general relativity with quantum mechanics, which describes everything that is not gravity. It would be valid in the first, searing moments of the universe when space-time was itself a tiny, jumbled quantum mess. Perhaps the three-dimensionality of space, not to mention the one-dimensionality of time, emerged from physics unknown during this hectic era. Causal dynamical triangulations, an alternative approach, depicts a quantum network of 2D elements that evolves into a macroscopic 3D space. Loop quantum gravity, meanwhile, replaces a smooth space-time with a version that is grainy or foamy at the smallest scales--but it takes the number three as an input and has done with it, says one of the theory's originators, Carlo Rovelli of the University of Aix-Marseille in France.