Foundations of observing dark energy dynamics with the Wilkinson Microwave Anisotropy Probe

By Pier Stefano Corasaniti, Martin Kunz, David Parkinson, Edmund J. Copeland, Bruce A. Bassett. 2004

192 citations recorded by the source corpus.

Detecting dark energy dynamics is the main quest of current dark energy research. Addressing the issue demands a fully consistent analysis of cosmic microwave background, large-scale structure and SN-Ia data with multiparameter freedom valid for all redshifts. Here we undertake a ten parameter analysis of general dark energy confronted with the first year Wilkinson Microwave Anisotropy Probe, 2dF galaxy survey and latest SN-Ia data. Despite the huge freedom in dark energy dynamics there are no new degeneracies with standard cosmic parameters apart from a mild degeneracy between reionization and the redshift of acceleration, both of which effectively suppress small scale power. Breaking this degeneracy will help significantly in detecting dynamics, if it exists. Our best-fit model to the data has significant late-time evolution at z<1.5. Phantom models are also considered and we find that the best-fit crosses w =-1 which, if confirmed, would be a clear signal for radically new physics. Treatment of such rapidly varying models requires careful integration of the dark energy density usually not implemented in standard codes, leading to crucial errors of up to 5%. Nevertheless cosmic variance means that standard Lambda cold dark matter models are still a very good fit to the data and evidence for dynamics is currently very weak. Independent tests of reionization or the epoch of acceleration (e.g., integrated Sachs-Wolfelarge scale structure correlations) or reduction of cosmic variance at large scales (e.g., cluster polarization at high redshift) may prove key in the hunt for dynamics.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/e2609ca948c627b0c7c495ccba116a5873dc6375

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Citations in the corpus

Galileon Cosmology (2009, background): “) Although the constraints from these observables should be revisited in the presence of a galileon, it has been argued that the allowed range of Ω (0) m is generally insensitive to the specifics of dark energy [45].”
FIVE-YEAR WILKINSON MICROWAVE ANISOTROPY PROBE OBSERVATIONS: COSMOLOGICAL INTERPRETATION (2008, unknown): “The “Kink model” explored in Bassett et al. (2002, 2004); Corasaniti et al. (2004) also extrapolates a constant equation of state at early times to a different constant equation of state at late times.”
The Essence of Quintessence and the Cost of Compression (2004, methodology): “…perturbations at all redshifts (Bassett et al. 2002; Corasaniti and Copeland 2002; Corasaniti et al. 2004) but is, of course, more computationally intensive, and care must be taken to accurately capture the dark energy dynamics of rapid transitions; see Appendix C of (Corasaniti et al. 2004).”