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Science

My Cand. Scient. thesis in theoretical physics is available here: ps.gz, pdf. It contains, among other things, an introduction to and numerical results on the ekpyrotic universe cosmological theory, which is a higher-dimensional brane-universe cosmological theory based on M theory. It is quite different from the ordinary big bang with inflation in standard modern cosmology. One assumes that the visible universe is a surface with three spatial dimensions called a 3-brane, which is embedded in a five-dimensional space. The ekpyrotic universe is an alternative to, or a higher dimensional perspective of the big bang. As seen from a five dimensional perspective, the big bang is the four dimensional manifestation of a collision between two such branes, in this theory.

Numerical Solution of the Ekpyrotic Scenario in the Moduli Space Approximation, Phys. Rev. D 71 107302 (2005). (hep-th/0502136) (download)

This is a collection of lectures I have given:

• Strengteori og Unifisering (pdf): Populærvitenskaplig foredrag om strengteori på Human-Etisk Forbund 25/1-2006
• Ekpyrotic Universe (pdf): Gong-show lecture on numerical results in the Ekpyrotic Universe model given at the Ångström Laboratory, Uppsala, May 2005.
• Loitering Universe (pdf): Journal Club lecture given on the article astro-ph/0410221 by Sahni/Shtanov at the Dark Energy project at the Theory Group Dept. of Physics, University of Oslo, December 2004.
• Atiyah-Singer Theorem for Physicists (pdf): Lecture given at the Theory Group at Dept. of Physics at the University of Oslo, May 2004. Unofficial lecture in connection with the Abel Prize lectures from the prize winners Atiyah and Singer.
• Extra Dimensions in Cosmology ( part 1: pdf, part 2: pdf, part 3: pdf): Three lectures on extra dimensions in cosmology given at the Dark Energy project at Institute for Theoretical Astrophysics, University of Oslo, February 2004.
• Ekpyrotic Universe (pdf): Seminar given at the October 2003 NorFA Network meeting at the University of Oslo.
• D-Braneworld Cosmology (pdf): Journal Club presentation of the articles hep-th/0302223 and hep-th/0310059 by Uesugi et al. at the Dark Energy project at the Institute for Theoretical Astrophysics, University of Oslo, October 2003.