Dark energy from discrete spacetime
| Autor: | Aaron D. Trout |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2013 |
| Předmět: |
General Relativity
General relativity lcsh:Medicine Astronomical Sciences Cosmological constant Astrophysics Physical cosmology Relativity Theoretical physics lcsh:Science Computerized Simulations Anthropic principle Quantum Mechanics Physics Multidisciplinary Spacetime lcsh:R Dark Energy Cosmology Natural units Computer Science Dark energy Quantum gravity lcsh:Q Physical Laws and Principles Research Article Computer Modeling Gravitation |
| Zdroj: | PLoS ONE, Vol 8, Iss 12, p e80826 (2013) PLoS ONE |
| ISSN: | 1932-6203 |
| Popis: | Dark energy accounts for most of the matter-energy content of our universe, yet current theories of its origin rely on radical physical assumptions such as the holographic principle or controversial anthropic arguments. We give a better motivated explanation for dark energy, claiming that it arises from a small negative scalar-curvature present even in empty spacetime. The vacuum has this curvature because spacetime is fundamentally discrete and there are more ways for a discrete geometry to have negative curvature than positive. We explicitly compute this effect using a variant of the well known dynamical-triangulations (DT) model for quantum gravity. Our model predicts a time-varying non-zero cosmological constant with a current value, [Formula: see text] in natural units, in agreement with observation. This calculation is made possible by a novel characterization of the possible DT action values combined with numerical evidence concerning their degeneracies. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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