Do observations offer evidence for cosmological-scale extra dimensions?
Abstract
We present a case that current observations may already indicate new gravitational physics on cosmological scales. The excess of power seen in the Lyman-α forest and small-scale CMB experiments, the anomalously large bulk flows seen both in peculiar velocity surveys and in kinetic SZ, and the higher ISW cross-correlation all indicate that structure may be more evolved than expected from ΛCDM. While these anomalies may constitute a statistical fluke or may eventually disappear as systematic effects are better understood, we argue that they can be explained in models with infinite-volume (or, at least, cosmological-size) extra dimensions, where the graviton is a resonance with a tiny width. The longitudinal mode of the graviton mediates an extra scalar force which speeds up structure formation at late times, thereby accounting for the above anomalies. The required graviton Compton wavelength is relatively small compared to the present Hubble radius, of order 300-600 Mpc. Moreover, with certain assumptions about the behavior of the longitudinal mode on super-Hubble scales, our modified gravity framework can also alleviate the tension with the low quadrupole and the peculiar vanishing of the CMB correlation function on large angular scales, seen both in COBE and WMAP. This relies on a novelmore »
- Authors:
-
- Perimeter Institute for Theoretical Physics, 33 Caroline Street North, Waterloo, Ontario N2L 2Y5 (Canada)
- Publication Date:
- OSTI Identifier:
- 22273238
- Resource Type:
- Journal Article
- Journal Name:
- Journal of Cosmology and Astroparticle Physics
- Additional Journal Information:
- Journal Volume: 2009; Journal Issue: 08; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1475-7516
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ASTROPHYSICS; COMPARATIVE EVALUATIONS; COMPTON WAVELENGTH; CORRELATION FUNCTIONS; CORRELATIONS; COSMOLOGICAL CONSTANT; COSMOLOGY; GRAVITATION; GRAVITONS; NONLUMINOUS MATTER; SCALARS
Citation Formats
Afshordi, Niayesh, Geshnizjani, Ghazal, and Khoury, Justin. Do observations offer evidence for cosmological-scale extra dimensions?. United States: N. p., 2009.
Web. doi:10.1088/1475-7516/2009/08/030.
Afshordi, Niayesh, Geshnizjani, Ghazal, & Khoury, Justin. Do observations offer evidence for cosmological-scale extra dimensions?. United States. https://doi.org/10.1088/1475-7516/2009/08/030
Afshordi, Niayesh, Geshnizjani, Ghazal, and Khoury, Justin. 2009.
"Do observations offer evidence for cosmological-scale extra dimensions?". United States. https://doi.org/10.1088/1475-7516/2009/08/030.
@article{osti_22273238,
title = {Do observations offer evidence for cosmological-scale extra dimensions?},
author = {Afshordi, Niayesh and Geshnizjani, Ghazal and Khoury, Justin},
abstractNote = {We present a case that current observations may already indicate new gravitational physics on cosmological scales. The excess of power seen in the Lyman-α forest and small-scale CMB experiments, the anomalously large bulk flows seen both in peculiar velocity surveys and in kinetic SZ, and the higher ISW cross-correlation all indicate that structure may be more evolved than expected from ΛCDM. While these anomalies may constitute a statistical fluke or may eventually disappear as systematic effects are better understood, we argue that they can be explained in models with infinite-volume (or, at least, cosmological-size) extra dimensions, where the graviton is a resonance with a tiny width. The longitudinal mode of the graviton mediates an extra scalar force which speeds up structure formation at late times, thereby accounting for the above anomalies. The required graviton Compton wavelength is relatively small compared to the present Hubble radius, of order 300-600 Mpc. Moreover, with certain assumptions about the behavior of the longitudinal mode on super-Hubble scales, our modified gravity framework can also alleviate the tension with the low quadrupole and the peculiar vanishing of the CMB correlation function on large angular scales, seen both in COBE and WMAP. This relies on a novel mechanism that cancels a late-time ISW contribution against the primordial Sachs-Wolfe amplitude.},
doi = {10.1088/1475-7516/2009/08/030},
url = {https://www.osti.gov/biblio/22273238},
journal = {Journal of Cosmology and Astroparticle Physics},
issn = {1475-7516},
number = 08,
volume = 2009,
place = {United States},
year = {Sat Aug 01 00:00:00 EDT 2009},
month = {Sat Aug 01 00:00:00 EDT 2009}
}