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Observations of distant supernovae and cosmological implications
Stockholm University, Faculty of Science, Department of Physics.
2006 (English)Doctoral thesis, comprehensive summary (Other academic)
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.

Place, publisher, year, edition, pages
Stockholm: Fysikum , 2006. , 102 p.
Keyword [en]
cosmological parameters, cosmology, astro physics, supernovae, type Ia supernova
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:su:diva-1019ISBN: 91-7155-250-2 (print)OAI: oai:DiVA.org:su-1019DiVA: diva2:189209
Public defence
2006-05-24, sal FA32, AlbaNova universitetscentrum, Roslagstullsbacken 21, Stockholm, 10:15
Opponent
Supervisors
Available from: 2006-05-02 Created: 2006-05-02Bibliographically approved
List of papers
1. Supernovae and the nature of the dark energy
Open this publication in new window or tab >>Supernovae and the nature of the dark energy
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2001 In: A&A, Vol. 380, 6-18 p.Article in journal (Refereed) Published
Identifiers
urn:nbn:se:su:diva-22638 (URN)
Note
Part of urn:nbn:se:su:diva-1019Available from: 2006-05-02 Created: 2006-05-02Bibliographically approved
2. Fitting inverse power-law quintessence models using the SNAP satellite
Open this publication in new window or tab >>Fitting inverse power-law quintessence models using the SNAP satellite
2002 In: Phys. Rev. D, Vol. 66, no 023530Article in journal (Refereed) Published
Identifiers
urn:nbn:se:su:diva-22639 (URN)
Note
Part of urn:nbn:se:su:diva-1019Available from: 2006-05-02 Created: 2006-05-02Bibliographically approved
3. SNOC: A Monte-Carlo simulation package for high-z supernova observations
Open this publication in new window or tab >>SNOC: A Monte-Carlo simulation package for high-z supernova observations
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2002 In: A&A, Vol. 392, 757-771 p.Article in journal (Refereed) Published
Identifiers
urn:nbn:se:su:diva-22640 (URN)
Note
Part of urn:nbn:se:su:diva-1019Available from: 2006-05-02 Created: 2006-05-02Bibliographically approved
4. Cosmological parameters from lensed supernovae
Open this publication in new window or tab >>Cosmological parameters from lensed supernovae
2002 In: A&A, Vol. 393, 25-32 p.Article in journal (Refereed) Published
Identifiers
urn:nbn:se:su:diva-22641 (URN)
Note
Part of urn:nbn:se:su:diva-1019Available from: 2006-05-02 Created: 2006-05-02Bibliographically approved
5. Correcting for lensing biasin the Hubble diagram
Open this publication in new window or tab >>Correcting for lensing biasin the Hubble diagram
2003 In: A&A, Vol. 397, 819-823 p.Article in journal (Refereed) Published
Identifiers
urn:nbn:se:su:diva-22642 (URN)
Note
Part of urn:nbn:se:su:diva-1019Available from: 2006-05-02 Created: 2006-05-02Bibliographically approved
6. New Constraints on Omega_M, Omega_Lambda and w from an independent set of 11 high-redshift supernovae observed with the Hubble Space Telescope
Open this publication in new window or tab >>New Constraints on Omega_M, Omega_Lambda and w from an independent set of 11 high-redshift supernovae observed with the Hubble Space Telescope
2003 In: ApJ, Vol. 598, 102-137 p.Article in journal (Refereed) Published
Identifiers
urn:nbn:se:su:diva-22643 (URN)
Note
Part of urn:nbn:se:su:diva-1019Available from: 2006-05-02 Created: 2006-05-02Bibliographically approved
7. Restframe I-band Hubble diagram for type Ia supernovae up to redshift z~0.5
Open this publication in new window or tab >>Restframe I-band Hubble diagram for type Ia supernovae up to redshift z~0.5
2005 In: A&A, Vol. 437, 789-804 p.Article in journal (Refereed) Published
Identifiers
urn:nbn:se:su:diva-22644 (URN)
Note
Part of urn:nbn:se:su:diva-1019Available from: 2006-05-02 Created: 2006-05-02Bibliographically approved

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