120 research outputs found
Impacts of different SNLS3 light-curve fitters on cosmological consequences of interacting dark energy models
We explore the cosmological consequences of interacting dark energy (IDE)
models using the SNLS3 supernova samples. In particular, we focus on the
impacts of different SNLS3 light-curve fitters (LCF) (corresponding to "SALT2",
"SiFTO", and "Combined" sample). Firstly, making use of the three SNLS3 data
sets, as well as the Planck distance priors data and the galaxy clustering
data, we constrain the parameter spaces of three IDE models. Then, we study the
cosmic evolutions of Hubble parameter , deceleration diagram ,
statefinder hierarchy and , and check whether or
not these dark energy diagnosis can distinguish the differences among the
results of different SNLS3 LCF. At last, we perform high redshift cosmic age
test using three old high redshift objects (OHRO), and explore the fate of the
Universe. We find that, the impacts of different SNLS3 LCF are rather small,
and can not be distinguished by using , , ,
, and the age data of OHRO. In addition, we infer, from the
current observations, how far we are from a cosmic doomsday in the worst case,
and find that the "Combined" sample always gives the largest 2 lower
limit of the time interval between "big rip" and today, while the results given
by the "SALT2" and the "SiFTO" sample are close to each other. These
conclusions are insensitive to a specific form of dark sector interaction. Our
method can be used to distinguish the differences among various cosmological
observations.Comment: 12 pages, 7 figures, 2 tables, accepted for publication in Astronomy
and Astrophysic
Reconstruction of the first consumer-driven marine ecosystem on Earth, perspectives from early Cambrian small skeletal fossils from China
Biological activity was the major triggering factor driving Earthâs organic and inorganic cycles across the biosphere, lithosphere, and atmosphere. A key question in the evolution of Earthâs ecosystem is when and how different animals emerged and flourished and how their appearance impacted the hydrosphere-atmosphere-lithosphere cycles. The Cambrian Explosion of metazoans in the EdiacaranâCambrian boundary interval resulted in sudden appearance of most of the readily fossilizable modern animal groups as macro-consumers in the Earthâs oceans. This explosive radiation event led for the first time to the emergence and diversification of animals on Earth, to the establishment of complex trophic webs with animals as consumers, and marks the onset of the Phanerozoic oceanic ecosystem. Our presentation aims to discuss the at least half-billion-year-old world of tubular and conical shelled organisms (sponges, conulariids, chancelloriids, hyoliths, mollusks, tommotiids, and other lophotrochozoans) that are unseen in the present-day oceans but were recovered by us from the siliciclastic and carbonate rocks in and outside of China. Additionally, to study the body fossils of exceptionally preserved biotas (Konversat-Lagerstätten) across China, efforts are underway to understand how the early animals, notably early bilaterians, created the over 500-million-year-old oceanic ecosystems without the influence of land plants, which appeared later
N6-methylandenosine-related gene expression signatures for predicting the overall survival and immune responses of patients with colorectal cancer
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