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LOS ANGELES Comprar Hombre Mujer Nike Air Max 270 Flyknit Army Verde Negras , Sept. 11 (Xinhua) -- An international research team led by Chinese astronomers revealed an evidence of dynamical dark energy.
The discovery, recently published on Nature Astronomy, with a News & Views article written by a world expert on cosmology, found that the nature of dark energy may not be the cosmological constant introduced by Albert Einstein 100 years ago, which is crucial for the study of dark energy.
The new study was supported by the National Natural Science Foundation of China (NSFC) Comprar Hombre Mujer Nike Air Max 270 Flyknit Marrones , Chinese Academy of Sciences, and a Royal Society Newton Advanced Fellowship.
Revealing the nature of dark energy is one of key goals of modern sciences. The physical property of dark energy is represented by its Equation of State (EoS), which is the ratio of pressure and energy density of dark energy.
In the traditional Lambda-Cold Dark Matter (LCDM) model, dark energy is essentially the cosmological constant, i.e. Comprar Nike Air Max 270 Mujer , the vacuum energy, with a constant EoS of -1. In this model, dark energy has no dynamical features.
In 2016, a team within the SDSS-III (BOSS) collaboration led by Prof. Gong-Bo Zhao of National Astronomical Observatories of China (NAOC) performed a successful measurement of the Baryonic Acoustic Oscillations (BAO) at multiple cosmic epochs with a high precision.
Based on this measurement and a method developed by Zhao for dark energy studies, the Zhao team found an evidence of dynamical dark energy at a significance level of 3.5 sigma. This suggests that the nature of dark energy may not be the vacuum energy Comprar Nike Air Max 270 Hombre , but some kind of dynamical field, especially for the quintom model whose EoS varies with time and crosses the -1 boundary during evolution, according to NAOC.
"As the Zhao team reported in this work, a dynamical dark energy model is able to naturally reconcile tensions between local and primordial measurements of cosmological parameters in the LCDM model," Prof. Xinmin Zhang at the Institute of High Energy Physics (IHEP) of the Chinese Academy of Sciences (CAS) told Xinhua.
"Which makes a crucial step towards understanding the nature of dark energy Comprar Nike Air Max 270 Hot Punch ," he added.
The dynamics of dark energy needs to be confirmed by next-generation astronomical surveys. The team points to the upcoming Dark Energy Spectroscopic Instrument (DESI) survey, which aims to begin creating a 3D cosmic map in 2018.
In the next five to ten years, the world largest galaxy surveys will provide observables which may be key to unveil the mystery of dark energy, according to a news release of NAOC.
BEIJING, Sept. 8 (Xinhua) -- The central parity rate of the Chinese currency Comprar Nike Air Max 270 Grape , the yuan, strengthened for the tenth consecutive working day to a nearly 16-month high against the U.S. dollar Friday.
The central parity rate of the yuan strengthened 237 basis points to 6.5032 against the U.S. dollar, its strongest level since May 2016, according to the China Foreign Exchange Trade System.
The adjustment came after a rise of 42 basis points Thursday and 59 basis points Wednesday. The rate fell below 6.6 last Friday, the first time since June last year.
In China's spot foreign exchange market Comprar Nike Air Max 270 Ocean Bliss , the yuan is allowed to rise or fall by 2 percent from the central parity rate each trading day.
The central parity rate of the yuan against the U.S. dollar is based on a weighted average of prices offered by market makers before the opening of the interbank market each business day.
The yuan has appreciated by 6 percent in cumulative terms against the dollar since the beginning of the year.
The dollar index against a basket of six major currencies was down 0.5 percent at 91.21 Friday as long-dated Treasury yields fell to 10-month lows.
Lingering concerns over tensions related to the Democratic People's Republic of Korea may limit the dollar's upside versus other major currencies, according to CITIC Securities.
Guan Tao, former head of the international payments department at the State Administration of Foreign Exchange, attributed the yuan's rise to China's solid economic fundamentals, stable cross-border capital flows and balanced supply-demand in the forex market.
China's economy expanded 6.9 percent in the first half Comprar Nike Air Max 270 Camo Heel , well above the target of around 6.5 percent for the year.
Its manufacturing activity expanded for the 13th consecutive month in August, providing fresh evidence of a firming economy.
China's forex reserves rose for the 7th month in a row in August to 3.092 trillion U.S. dollars, increasing 10.8 billion dollars from a month earlier.
"So far, the aim to keep the yuan exchange rate basically stable at a reasonable and balanced level has reached better-than-expected success," Guan said.
While recent weakness of the U.S. dollar and market sentiment have strengthened the yuan Comprar Nike Air Max 270 White Volt , UBS economist Wang Tao does not see the yuan embarking on a multi-year appreciation path.
"We expect the dollar and the yuan to be range bound for the remainder of the year, trading at 6.5-6.6 at the end of the year," Wang said in a research note.
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LAMU, Kenya, July 14 (Xinhua) -- Kenya's security officers onFriday recovered three bodies Comprar Nike Air Max 270 Ultramarine , bringing to five the number of thosekilled in an operation to rescue six nationals abducted byAl-Shabaab in coastal Lamu region on Thursday.
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