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Restframe I-band Hubble diagram for type Ia supernovae up to redshift z~0.5
Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
2005 Ingår i: A&A, Vol. 437, s. 789-804Artikel i tidskrift (Refereegranskat) Published
Ort, förlag, år, upplaga, sidor
2005. Vol. 437, s. 789-804
Identifikatorer
URN: urn:nbn:se:su:diva-22644OAI: oai:DiVA.org:su-22644DiVA, id: diva2:189208
Anmärkning
Part of urn:nbn:se:su:diva-1019Tillgänglig från: 2006-05-02 Skapad: 2006-05-02Bibliografiskt granskad
Ingår i avhandling
1. Observations of distant supernovae and cosmological implications
Öppna denna publikation i ny flik eller fönster >>Observations of distant supernovae and cosmological implications
2006 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

Type Ia supernovae can be used as distance indicators for probing the expansion history of the Universe. The method has proved to be an efficient tool in cosmology and played a decisive role in the discovery of a yet unknown energy form, dark energy, that drives the accelerated expansion of the Universe. The work in this thesis addresses the nature of dark energy, both by presenting existing data, and by predicting opportunities and difficulties related to possible future data.

Optical and infrared measurements of type Ia supernovae for different epochs in the cosmic expansion history are presented along with a discussion of the systematic errors. The data have been obtained with several instruments, and an optimal method for measuring the lightcurve of a background contaminated source has been used. The procedure was also tested by applying it on simulated images.

The future of supernova cosmology, and the target precision of cosmological parameters for the proposed SNAP satellite are discussed. In particular, the limits that can be set on various dark energy scenarios are investigated. The possibility of distinguishing between different inverse power-law quintessence models is also studied. The predictions are based on calculations made with the Supernova Observation Calculator, a software package, introduced in the thesis, for simulating the light propagation from distant objects. This tool has also been used for investigating how SNAP observations could be biased by gravitational lensing, and to what extent this would affect cosmology fitting. An alternative approach for estimating cosmological parameters, where lensing effects are taken into account, is also suggested. Finally, it is investigated to what extent strongly lensed core-collapse supernovae could be used as an alternative approach for determining cosmological parameters.

Ort, förlag, år, upplaga, sidor
Stockholm: Fysikum, 2006. s. 102
Nyckelord
cosmological parameters, cosmology, astro physics, supernovae, type Ia supernova
Nationell ämneskategori
Astronomi, astrofysik och kosmologi
Identifikatorer
urn:nbn:se:su:diva-1019 (URN)91-7155-250-2 (ISBN)
Disputation
2006-05-24, sal FA32, AlbaNova universitetscentrum, Roslagstullsbacken 21, Stockholm, 10:15
Opponent
Handledare
Tillgänglig från: 2006-05-02 Skapad: 2006-05-02Bibliografiskt granskad

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