Cosmological Avatars of the Landscape II: CMB and LSS Signatures
R. Holman (Carnegie Mellon University), Laura Mersini-Houghton, (UNC-Chapel Hill), Tomo Takahashi (Saga University)

TL;DR
This paper explores how modifications to the Friedmann equation from landscape models imprint unique signatures on the CMB and LSS, potentially explaining observed data and revealing noninflationary contributions.
Contribution
It demonstrates how long wavelength mode effects alter cosmological spectra, providing distinctive observational signatures that differentiate this model from others.
Findings
Suppression of $\sigma_8$ and CMB $TT$ spectrum at large angles.
Imprinted features on matter power spectrum indicating primordial voids.
Correlation signatures between cosmic shear and temperature anisotropies suggest noninflationary LSS contributions.
Abstract
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…
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