Constraining dark energy fluctuations with supernova correlations

Blomqvist, MichaelStockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC) (författare)

We investigate constraints on dark energy fluctuations using type Ia supernovae. If dark energy is not in the form of a cosmological constant, that is if the equation of state is not equal to -1, we expect not only temporal, but also spatial variations in the energy density. Such fluctuations would cause local variations in the universal expansion rate and directional dependences in the redshift-distance relation. We present a scheme for relating a power spectrum of dark energy fluctuations to an angular covariance function of standard candle magnitude fluctuations. The predictions for a phenomenological model of dark energy fluctuations are compared to observational data in the form of the measured angular covariance of Hubble diagram magnitude residuals for type Ia supernovae in the Union2 compilation. The observational result is consistent with zero dark energy fluctuations. However, due to the limitations in statistics, current data still allow for quite general dark energy fluctuations as long as they are in the linear regime.

NATURVETENSKAP Fysik Astronomi, astrofysik och kosmologi hsv//swe
NATURAL SCIENCES Physical Sciences Astronomy, Astrophysics and Cosmology hsv//eng
cosmology
dark energy
supernovae
Astronomy and astrophysics
Astronomi och astrofysik
Cosmology
Kosmologi
Astronomy
astronomi

Enander, JonasStockholms universitet,Fysikum,Oskar Klein-centrum för kosmopartikelfysik (OKC),CoPS(Swepub:su)joen6240 (författare)
Mörtsell, EdvardStockholms universitet,Fysikum,Oskar Klein-centrum för kosmopartikelfysik (OKC),CoPS(Swepub:su)edvard (författare)
Stockholms universitetInstitutionen för astronomi (creator_code:org_t)

Ingår i:Journal of Cosmology and Astroparticle Physics: IOP Publishing10, s. 018-1475-7516

Av författaren/redakt...: Blomqvist, Micha ...; Enander, Jonas; Mörtsell, Edvard

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