Cosmic voids could probe dark energy

• Autores: Anil Ananthaswamy
• Localización: New scientist, ISSN 0262-4079, Nº. 2951, 2014, pág. 11
• Idioma: inglés
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• Resumen

  • Thought to be a mysterious force pushing the universe apart, dark energy was dreamed up to explain the discovery that the expansion of the universe is accelerating. Martin Sahlen of the University of Oxford and his colleagues invoke a new field that changes dark energy's density, depending on the local density of ordinary matter. Such dark energy has an observable consequence: it causes space-time in large, under-dense regions known as voids to behave differently than if dark energy were a cosmological constant. Where regions of high density, such as galaxy clusters, warp space-time to bend light towards people like a magnifying glass, voids bend light away like a concave lens.