Pangenesis: a common origin for visible and dark matter

The similar mass densities observed for visible and dark matter in the present-day universe suggest a common origin for both. A scheme called "pangenesis" for realising this using the Affleck-Dine mechanism in a baryon-symmetric universe is presented in this talk.Comment: 8 pages. Invited talk, CosPA 2011, Beijing Oct 2011, to appear in the proceeding

The brane as a Higgs domain wall: ideas and issues

The most obvious field-theoretic model for a brane is a scalar field domain wall or kink. I discuss how this idea can be connected with spontaneous internal symmetry breaking via a mechanism called the ``clash of symmetries''. Compatibility with Randall and Sundrum's warped metric alternative to compactification is then demonstrated. I end with brief remarks about open questions.Comment: 4 pages. Invited talk at Susy06. To appear in the proceeding

Mirror Neutrinos and the Early Universe

I review the construction of the Exact Parity or Mirror Matter Model and explain how it solves the solar and atmospheric neutrino problems. The oscillation driven relic neutrino asymmetry amplification phenomenon is then used to demonstrate the consistency of the model with Big Bang Nucleosynthesis.Comment: 7 pages, 2 embedded figures, Latex, uses ws-p8-50x6-00. Invited talk at COSMO99, to appear in the proceeding

Neutrinos in cosmology, with some significant digressions

Neutrinos play prominent roles in both particle physics and cosmology. In this talk, I will cover two broad topics. The first will be possible origins for neutrino masses and mixings and the implications of this physics for cosmology. Some non-cosmological digressions on the flavour problem in general will be made. The second topic will be Big Bang Nucleosynthesis (BBN) and bounds on active-sterile neutrino mixing.Comment: 19 pages, 6 figures. AIP proceedings style. Invited talk at 3rd Tropical Workshop on Particle Physics and Cosmology, San Juan, Puerto Rico, Aug 19-24 2002. To appear in the proceeding