87 research outputs found
'Tilting' the Universe with the Landscape Multiverse: The 'Dark' Flow
The theory for the selection of the initial state of the universe from the
landscape multiverse predicts superhorizon inhomogeneities induced by nonlocal
entanglement of our Hubble volume with modes and domains beyond the horizon.
Here we show these naturally give rise to a bulk flow with correlation length
of order horizon size. The modification to the gravitational potential has a
characteristic scale , and it originates from the
preinflationary remnants of the landscape. The 'tilt' in the potential induces
power to the lowest CMB multipoles, with the dominant contribution being the
dipole and next, the quadrupole. The induced multipoles are aligned
with an axis normal to their alignment plane being oriented along the preferred
frame determined by the dipole. The preferred direction is displayed by the
velocity field of the bulk flow relative to the expansion frame of the
universe. The parameters are tightly constrained thus the derived modifications
lead to robust predictions for testing our theory. The 'dark' flow was recently
discovered by Kashlinsky et al. to be about which seems in good
agreement with our predictions for the induced dipole of order .
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 preinflationary
physics and a window onto the landscape multiverse.Comment: 7 pgs, 2 fig
Why the Universe Started from a Low Entropy State
We show that the inclusion of backreaction of massive long wavelengths
imposes dynamical constraints on the allowed phase space of initial conditions
for inflation, which results in a superselection rule for the initial
conditions. Only high energy inflation is stable against collapse due to the
gravitational instability of massive perturbations. We present arguments to the
effect that the initial conditions problem {\it cannot} be meaningfully
addressed by thermostatistics as far as the gravitational degrees of freedom
are concerned. Rather, the choice of the initial conditions for the universe in
the phase space and the emergence of an arrow of time have to be treated as a
dynamic selection.Comment: 12 pages, 2 figs. Final version; agrees with accepted version in
Phys. Rev.
Investigation of the selection of original universe proposal
We investigate the Selection of Original Universe Proposal (SOUP) of Tye et al and show that as it stands, this proposal is flawed. The corrections to the Euclidean gravity action that were to select a Universe with a sufficiently large value of the cosmological constant Λ to allow for an inflationary phase only serve to renormalize the cosmological constant so that Λ→Λeff. SOUP then predicts a wave function that is highly peaked around Λeff→0, thereby reintroducing the issue of how to select initial conditions allowing for inflation in the early Universe
'Tilting' the Universe with the Landscape Multiverse: The 'Dark' Flow
The theory for the selection of the initial state of the universe from the
landscape multiverse predicts superhorizon inhomogeneities induced by nonlocal
entanglement of our Hubble volume with modes and domains beyond the horizon.
Here we show these naturally give rise to a bulk flow with correlation length
of order horizon size. The modification to the gravitational potential has a
characteristic scale , and it originates from the
preinflationary remnants of the landscape. The 'tilt' in the potential induces
power to the lowest CMB multipoles, with the dominant contribution being the
dipole and next, the quadrupole. The induced multipoles are aligned
with an axis normal to their alignment plane being oriented along the preferred
frame determined by the dipole. The preferred direction is displayed by the
velocity field of the bulk flow relative to the expansion frame of the
universe. The parameters are tightly constrained thus the derived modifications
lead to robust predictions for testing our theory. The 'dark' flow was recently
discovered by Kashlinsky et al. to be about which seems in good
agreement with our predictions for the induced dipole of order .
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 preinflationary
physics and a window onto the landscape multiverse.Comment: 7 pgs, 2 fig
Cosmological avatars of the landscape. I. Bracketing the supersymmetry breaking scale
We investigate the effects of quantum entanglement between our horizon patch and others due to the tracing out of long wavelength modes in the wave function of the Universe as defined on a particular model of the landscape. In this, the first of two papers devoted to this topic, we find that the SUSY breaking scale is bounded both above and below: 10-10MP≤MSUSY≤10-8MP for grand unified theory (GUT) scale inflation. Bounds on the SUSY breaking parameter depend on the scale of inflation. If inflation occurred at GUT energies, the lower bound on b is at least 5 orders of magnitude larger than the expected value of this parameter, soon to be tested by LHC
Cosmological Avatars of the Landscape II: CMB and LSS Signatures
This is the second paper in the series that confronts predictions of a model
of the landscape with cosmological observations. We show here how the
modifications of the Friedmann equation due to the decohering effects of long
wavelength modes on the wavefunction of the Universe defined on the landscape
leave unique signatures on the CMB spectra and large scale structure (LSS). We
show that the effect of the string corrections is to suppress and
the CMB spectrum at large angles, thereby bringing WMAP and SDSS data for
into agreement. We find interesting features imprinted on the matter
power spectrum : power is suppressed at large scales indicating the
possibility of primordial voids competing with the ISW effect. Furthermore,
power is enhanced at structure and substructure scales, . Our smoking gun for discriminating this proposal from others
with similar CMB and LSS predictions come from correlations between cosmic
shear and temperature anisotropies, which here indicate a noninflationary
channel of contribution to LSS, with unique ringing features of nonlocal
entanglement displayed at structure and substructure scales.Comment: 7 pages, 4 figure
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