19 research outputs found
Entanglement Dynamics between Inertial and Non-uniformly Accelerated Detectors
We study the time-dependence of quantum entanglement between two Unruh-DeWitt
detectors, one at rest in a Minkowski frame, the other non-uniformly
accelerated in some specified way. The two detectors each couple to a scalar
quantum field but do not interact directly. The primary challenge in problems
involving non-uniformly accelerated detectors arises from the fact that an
event horizon is absent and the Unruh temperature is ill-defined. By numerical
calculation we demonstrate that the correlators of the accelerated detector in
the weak coupling limit behaves like those of an oscillator in a bath of
time-varying "temperature" proportional to the instantaneous proper
acceleration of the detector, with oscillatory modifications due to
non-adiabatic effects. We find that in this setup the acceleration of the
detector in effect slows down the disentanglement process in Minkowski time due
to the time dilation in that moving detectorComment: 20 pages, 15 figures; References added; More analysis given in
Appendix C; Typos correcte
Towards a genotypic adaptation strategy for Indian groundnut cultivation using an ensemble of crop simulations
Tensor clustering with algebraic constraints gives interpretable groups of crosstalk mechanisms in breast cancer
Responses ofHelix pomatia to anoxia: Changes of solute activity and other properties of the haemolymph
Seabird avoidance and attraction at an offshore wind farm in the Belgian part of the North Sea
The effectiveness of different meso-scale rugosity metrics for predicting intra-habitat variation in coral-reef fish assemblages
Habitat structure is frequently an important variable affecting species' abundances and diversity, and identifying the key aspects and spatial scales of habitat complexity is critical for understanding the ecology and conservation of a range of communities. Many coral-reef fishes are intimately linked with benthic habitat structure, and previous research has demonstrated rugosity as an important predictive variable of assemblage parameters. However, these studies typically consider rugosity at small scales, amalgamate multiple habitat features, or are semi-quantitative. This study considers meso-scale rugosity (within 51 plots of 25 m(2) on a Belizean forereef) generated by varying coral densities, heights, and complexities. Seven rugosity metrics were calculated for each plot, and were regressed against each of 11 fish assemblage parameters. Intra-habitat variability of each fish parameter was significantly positively or curvilinearly correlated to at least one metric of meso-scale rugosity, but the metric generating the strongest correlation varied. The abundance of small fishes, and consequently most of the assemblage statistics (e.g., total fish abundance and diversity) were best predicted by the number of tall (> 50 cm) corals. The abundance of damselfishes, parrotfish biomass, the abundances of medium-sized and large fishes, and total fish biomass were curvilinearly related to mean coral height. The abundances of wrasses and surgeonfishes were most strongly correlated with the number of corals within a plot. Because coral-generated meso-scale rugosity is an important factor influencing intra-habitat variation in fishes, it should be explicitly considered when investigating fish-habitat relationships and predicting the impacts of coral mortality on ecosystem processes and services