Computer Science
Scientific paper
Jan 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995phdt........15d&link_type=abstract
Thesis (PH.D.)--THE OHIO STATE UNIVERSITY, 1995.Source: Dissertation Abstracts International, Volume: 56-12, Section: B, page: 6
Computer Science
Dark Matter, Self Interacting
Scientific paper
This Dissertation presents a new gauge formulation for general relativistic perturbation theory that is designed for simplicity in application. The theory is applied to two new models for structure formation involving hot particles: self-interacting dark matter and Gaussian isocurvature hot dark matter. Self-interacting particles react strongly with themselves, including number changing interactions, but not with ordinary matter. They can annihilate some of their number to sustain the temperature of the gas above that of an ordinary particle, thus permitting the damping of small scales by either Jeans suppression or free-streaming, depending on the strength of the pressure interactions. It was found that models which allow sufficient small scale structure to agree with damped Lyman alpha system observations will produce excess power on large scales when compared to galaxy observations. Models with isocurvature perturbations in hot dark matter were also investigated. The isocurvature fluctuation in the baryons preserves small scale power that would ordinarily be suppressed by free-streaming. It was observed that models with only isocurvature perturbations and a power law spectrum neither produced sufficient damped Lyman alpha systems nor satisfied constraints on the power index from COBE observations of the microwave background. However, models which included both adiabatic and isocurvature perturbations are consistent with galaxy observations, COBE or damped Lyman alpha observations. For damped Lyman alpha systems in particular, we found a natural bias in the linear regime which enhances the baryon fraction in such systems above the expected Omega B..
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