Essays about: "kosmisk tid"
Found 3 essays containing the words kosmisk tid.
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1. Void Evolution and Cosmic Star Formation
University essay from Uppsala universitet/Institutionen för fysik och astronomiAbstract : The rate at which stars have formed throughout the history of theuniverse is not constant, it started out slow, increased until around redshift ∼ 2 when it reversed and became slower again. The reason for this behaviour is still being investigated with various models and simulations usually based upon dark matter halos. READ MORE
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2. Galaxies as Clocks and the Universal Expansion
University essay from KTH/FysikAbstract : The Hubble parameter H(z) is a measure of the expansion rate of the universe at redshift z. One method to determine it relies on inferring the slope of the redshift with respect to cosmic time, where galaxy ages can be used as a proxy for the latter. This method is used by Simon et al. READ MORE
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3. Cosmic ray tracks in chondritic material with focus on silicate mineral inclusions in chromite
University essay from Lunds universitet/Geologiska institutionenAbstract : It has been suggested that the cosmic ray flux varies as Earth moves relative to the spiral arms in the galaxy. However, no satisfying record over the cosmic ray flux over long time scales has been presented. READ MORE