Supernovae as seen by off-center observers in a local void

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Blomqvist, Michael,1980-Stockholms universitet,Institutionen för astronomi (författare)

Supernovae as seen by off-center observers in a local void

Artikel/kapitelEngelska2010

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2010-05-11
IOP Publishing,2010
printrdacarrier

Nummerbeteckningar

LIBRIS-ID:oai:DiVA.org:su-35887
https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-35887URI
https://doi.org/10.1088/1475-7516/2010/05/006DOI

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Språk:engelska
Sammanfattning på:engelska

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Ämneskategori:ref swepub-contenttype
Ämneskategori:art swepub-publicationtype

Anmärkningar

Inhomogeneous universe models have been proposed as an alternative explanation for the apparent acceleration of the cosmic expansion that does not require dark energy. In the simplest class of inhomogeneous models, we live within a large, spherically symmetric void. Several studies have shown that such a model can be made consistent with many observations, in particular the redshift-luminosity distance relation for type Ia supernovae, provided that the void is of Gpc size and that we live close to the center. Such a scenario challenges the Copernican principle that we do not occupy a special place in the universe. We use the first-year Sloan Digital Sky Survey-II supernova search data set as well as the Constitution supernova data set to put constraints on the observer position in void models, using the fact that off-center observers will observe an anisotropic universe. We first show that a spherically symmetric void can give good fits to the supernova data for an on-center observer, but that the two data sets prefer very different voids. We then continue to show that the observer can be displaced at least fifteen percent of the void scale radius from the center and still give an acceptable fit to the supernova data. When combined with the observed dipole anisotropy of the cosmic microwave background however, we find that the data compells the observer to be located within about one percent of the void scale radius. Based on these results, we conclude that considerable fine-tuning of our position within the void is needed tofit the supernova data, strongly disfavouring the model from a Copernican principle point of view.

Ämnesord och genrebeteckningar

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

Biuppslag (personer, institutioner, konferenser, titlar ...)

Mörtsell, EdvardStockholms universitet,Fysikum,CoPS(Swepub:su)edvard (författare)
Stockholms universitetInstitutionen för astronomi (creator_code:org_t)

Sammanhörande titlar

Ingår i:Journal of Cosmology and Astroparticle Physics: IOP Publishing05, s. 006-1475-7516

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

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NATURVETENSKAP: NATURVETENSKAP; och Fysik; och Astronomi astrof ...

Artiklar i publikationen: Journal of Cosmo ...

Av lärosätet: Stockholms universitet

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