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Svarta hål i Vintergatan: Mörk materia, gravitationslinser och MACHOs
Örebro University, School of Science and Technology.
2009 (Swedish)Independent thesis Advanced level (degree of Master (One Year)), 20 credits / 30 HE creditsStudent thesis
Abstract [sv]

Ett av de mest notoriska dilemman i dagens kosmologi är den mörka materians natur och dess förekomst i universum. Mot bakgrund av detta har nya forskningsdiscipliner med rötterna i Einsteins relativitetsteori växt fram, bl.a. teorin om gravitationslinser som möjliggör en indirekt observationsmetod av ljussvaga kompakta objekt som annars skulle vara mycket svåra eller omöjliga att upptäcka på traditionella vis, såsom svarta hål.

Via en genomgång av grundteorin för gravitationslinser, några enkla teoretiska studier och en grundläggande felmarginalsanalys illustreras hur olika typer av kompakta objekt i Vintergatans omedelbara omgivning kan ge upphov till vissa karakteristiska linsfenomen. Detta sätts i relation till rådande teorier om den tidigaste stjärnbildningen och de massiva kompakta rester som denna generation av mycket massiva stjärnor bör ha efterlämnat – i synnerhet intermediära svarta hål med massor på 100-1000 Msol som ännu kan finnas i dagens mörka galaxhalor. Sådana objekt kan komma att upptäckas i betydligt högre grad i framtiden med de observationstekniker som är under utveckling idag. 

Abstract [en]

One of the most notorious dilemmas in cosmology today is the nature of dark matter and its distribution in the universe. Due to this, new research disciplines originating from Einstein’s theory of relativity have emerged, among them the theory of gravitational lensing which makes it possible to indirectly observe faint compact objects that would otherwise be very difficult or impossible to discover with traditional means, up to and including black holes.

Through a rundown of the basic theory of gravitational lensing, a couple of simple theoretical models and an elementary error analysis, it is illustrated how different types of compact objects in the immediate vicinity of the Milky Way can yield various characteristic lensing phenomena. This is put in relation to contemporary theories regarding the earliest star formation and the massive compact remnants this generation of very massive stars should have left behind – particularly intermediate black holes with masses of 100-1000 Msun that may still be found in dark galactic halos of today. Such objects can contribute to future observations carried out with the observational technology being developed at present.

Place, publisher, year, edition, pages
2009. , p. 39
Keywords [sv]
svarta hål, gravitationslins, MACHO, mörk materia
National Category
Astronomy, Astrophysics and Cosmology Astronomy, Astrophysics and Cosmology Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:oru:diva-9785ISRN: ORU-NAT/FYS-AG-2010/1--SEOAI: oai:DiVA.org:oru-9785DiVA, id: diva2:297998
Presentation
(Undetermined)
Uppsok
Physics, Chemistry, Mathematics
Supervisors
Examiners
Available from: 2010-02-22 Created: 2010-02-19 Last updated: 2017-10-18Bibliographically approved

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