39,505 research outputs found
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
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
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
Biology of nesting sea turtles along the Florida panhandle
The purpose of this study was to determine how the dynamic system off Cape San Blas affects its unique group of
nesting sea turtles. We assessed:
1. changes in beach topography,
2. changes in offshore topography,
3. current flows and direction,
4. tidal patterns,
5. sand composition and origin,
6. sea turtle nesting pattern, and
7. structure of the sea turtle group nesting along Cape San Blas. (9 page document
Incubation temperatures and sex ratios of loggerhead sea turtles (Caretta caretta) hatched on Northwest Florida beaches
The purpose ofthis project was to collect sand and nest temperature information from loggerhead nesting
beaches and in situ nests in Northwest Florida, perform sex ratio analysis on eggs collected from those nests, and
describe general sand characteristics and variations in weather conditions within the experimental area. This
information was to be used to determine what variations in sand temperatures and loggerhead nest incubation
temperatures exist across Northwest Florida, evaluate differences in sand characteristics and weather conditions
throughout the Florida Panhandle and how these differences relate to variations in incubation temperatures, and
determine the sex ratios of loggerhead sea turtles produced on Northwest Florida beaches.(3 page document
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