Evolution of density fluctuations during recombination

Intermediate-k Density and Magnetic Field Fluctuations During Inter-ELM Pedestal Evolution in MAST

Measurements of local density and magnetic field fluctuations near the pedestal top, conditionally-averaged over the ELM cycle, have been made in MAST. A Doppler backscattering (DBS) system installed at MAST was used to measure intermediate-k (k⊥ρi ≈ 3 − 4) density fluctuations at the top of the pedestal. A novel diagnostic technique combining DBS with crosspolarization scattering (CP-DBS) enab...

The evolution of sex and recombination in response to abiotic or coevolutionary fluctuations in epistasis.

Evolutionary biologists have identified several factors that could explain the widespread phenomena of sex and recombination. One hypothesis is that host-parasite interactions favor sex and recombination because they favor the production of rare genotypes. A problem with many of the early models of this so-called Red Queen hypothesis is that several factors are acting together: directional sele...

Extracting primordial density fluctuations

The combination of detections of anisotropy in cosmic microwave background radiation and observations of the large-scale distribution of galaxies probes the primordial density fluctuations of the universe on spatial scales varying by three orders of magnitude. These data are found to be inconsistent with the predictions of several popular cosmological models. Agreement between the data and the ...

Optical Recombination Lines and Temperature Fluctuations

The evolution of plastic recombination.

Empirical data suggest that recombination rates may change in response to stress. To study the evolution of plastic recombination, we develop a modifier model using the same theoretical framework used to study conventional (nonplastic) modifiers, thus allowing direct comparison. We examine the evolution of plastic recombination in both haploid and diploid systems. In haploids, a plastic modifie...