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An Entangled Universe
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We propose a possible quantum signature of the early Universe that could lead to observational imprints of the quantum nature of the inflationary period. Graviton production in the presence of an inflaton scalar field results in entangled states in polarization. This is because of a non-trivial effect due to the derivatives on two scalar fluctuations and it provides a fingerprint that depends on the polarization of the graviton that Alice and/or Bob measured in their patch. At horizon crossing, interactions between the gravitons and inflatons perform the required Bell experiments leading to a definitive measure. We hint how this signature could be measure in the high-order correlation function of galaxies, in particular on the halo bias and the intrinsic alignment.
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Planckeons as mouths of quantum wormholes and holographic origin of spacetime
Planckeons, treated as wormhole mouths on holographic surfaces, yield a lattice-gas model whose entropy matches black hole entropy only when the cell area is chosen by hand.
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