Abstract
We consider how quintessence models in which the sound speed differs from the speed of light and varies with time affect the cosmic microwave background and the fluctuation power spectrum. Significant modifications occur on length scales related to the Hubble radius during epochs in which the sound speed is near zero and the quintessence contributes a non-negligible fraction of the total energy density. For the microwave background, we find that the usual enhancement of the lowest multipole moments by the integrated Sachs-Wolfe effect can be modified, resulting in suppression or bumps instead. Also, the sound speed can produce oscillations and other effects at wavenumbers
Keywords
QuintessencePhysicsCosmic microwave backgroundMultipole expansionSpeed of soundRADIUSSpectral densityMicrowaveMatter power spectrumAstrophysicsDark energyCosmologyQuantum mechanicsAnisotropy
Affiliated Institutions
Related Publications
Neutrino and dark radiation properties in light of recent CMB observations
Recent cosmic microwave background measurements at high multipoles from the South Pole Telescope and from the Atacama Cosmology Telescope seem to disagree in their conclusions f...
Robustness of cosmic neutrino background detection in the cosmic microwave background
The existence of a cosmic neutrino background can be probed indirectly by CMB experiments, not only by measuring the background density of radiation in the universe, but also by...
Signatures of relativistic neutrinos in CMB anisotropy and matter clustering
We present a detailed analytical study of ultra-relativistic neutrinos in cosmological perturbation theory and of the observable signatures of inhomogeneities in the cosmic neut...
First‐Year <i>Wilkinson Microwave Anisotropy Probe</i> ( <i>WMAP</i> ) Observations: Preliminary Maps and Basic Results
We present full sky microwave maps in five frequency bands (23 to 94 GHz) from the WMAP first year sky survey. Calibration errors are less than 0.5% and the low systematic error...
Cosmological Imprint of an Energy Component with General Equation of State
We examine the possibility that a significant component of the energy density of the universe has an equation-of-state different from that of matter, radiation or cosmological c...
Publication Info
- Year
- 2003
- Type
- article
- Volume
- 67
- Issue
- 10
- Citations
- 121
- Access
- Closed
External Links
Social Impact
Altmetric
PlumX Metrics
Social media, news, blog, policy document mentions
Citation Metrics
121
OpenAlex
Cite This
Simon DeDeo,
Robert R. Caldwell,
Paul J. Steinhardt
(2003).
Effects of the sound speed of quintessence on the microwave background and large scale structure.
Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fields
, 67
(10)
.
https://doi.org/10.1103/physrevd.67.103509
Identifiers
- DOI
- 10.1103/physrevd.67.103509