6,088 research outputs found
Effects of time-varying in SNLS3 on constraining interacting dark energy models
It has been found that, for the Supernova Legacy Survey three-year (SNLS3)
data, there is strong evidence for the redshift-evolution of color-luminosity
parameter . In this paper, adopting the -cold-dark-matter (CDM)
model and considering its interacting extensions (with three kinds of
interaction between dark sectors), we explore the evolution of and its
effects on parameter estimation. In addition to the SNLS3 data, we also take
into account the Planck distance priors data of the cosmic microwave background
(CMB), the galaxy clustering (GC) data extracted from SDSS DR7 and BOSS, as
well as the direct measurement of Hubble constant from the Hubble Space
Telescope (HST) observation. We find that, for all the interacting dark energy
(IDE) models, adding a parameter of can reduce by 34,
indicating that is ruled out at 5.8 confidence level
(CL). Furthermore, it is found that varying can significantly change
the fitting results of various cosmological parameters: for all the dark energy
models considered in this paper, varying yields a larger
and a larger ; on the other side, varying yields a smaller for
the CDM model, but has no impact on for the three IDE models. This
implies that there is a degeneracy between and . Our work shows
that the evolution of is insensitive to the interaction between dark
sectors, and then highlights the importance of considering 's evolution
in the cosmology fits.Comment: 11 pages, 6 figures, 1 table; revised version accepted by EPJC. arXiv
admin note: substantial text overlap with arXiv:1310.6109, arXiv:1312.018
Spatio-temporal mapping of variation potentials in leaves of Helianthus annuus L. seedlings in situ using multi-electrode array.
Damaging thermal stimuli trigger long-lasting variation potentials (VPs) in higher plants. Owing to limitations in conventional plant electrophysiological recording techniques, recorded signals are composed of signals originating from all of the cells that are connected to an electrode. This limitation does not enable detailed spatio-temporal distributions of transmission and electrical activities in plants to be visualised. Multi-electrode array (MEA) enables the recording and imaging of dynamic spatio-temporal electrical activities in higher plants. Here, we used an 8 × 8 MEA with a polar distance of 450 μm to measure electrical activities from numerous cells simultaneously. The mapping of the data that were recorded from the MEA revealed the transfer mode of the thermally induced VPs in the leaves of Helianthus annuus L. seedlings in situ. These results suggest that MEA can enable recordings with high spatio-temporal resolution that facilitate the determination of the bioelectrical response mode of higher plants under stress
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