'Tilting' the Universe with the Landscape Multiverse: The 'Dark' Flow - High Energy Physics - TheoryReportar como inadecuado




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Abstract: The theory for the selection of the initial state of the universe from thelandscape multiverse predicts superhorizon inhomogeneities induced by nonlocalentanglement of our Hubble volume with modes and domains beyond the horizon.Here we show these naturally give rise to a bulk flow with correlation lengthof order horizon size. The modification to the gravitational potential has acharacteristic scale $L {1} \simeq 10^{3} H^{-1}$, and it originates from thepreinflationary remnants of the landscape. The -tilt- in the potential inducespower to the lowest CMB multipoles, with the dominant contribution being thedipole and next, the quadrupole. The induced multipoles $l \le 2$ are alignedwith an axis normal to their alignment plane being oriented along the preferredframe determined by the dipole. The preferred direction is displayed by thevelocity field of the bulk flow relative to the expansion frame of theuniverse. The parameters are tightly constrained thus the derived modificationslead to robust predictions for testing our theory. The -dark- flow was recentlydiscovered by Kashlinsky et al. to be about $700 km-s$ which seems in goodagreement with our predictions for the induced dipole of order $3 \mu K$.Placed in this context, the discovery of the bulk flow by Kashlinsky et al.becomes even more interesting as it may provide a probe of the preinflationaryphysics and a window onto the landscape multiverse.



Autor: L. Mersini-Houghton, R. Holman

Fuente: https://arxiv.org/







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