本文選題：暗能量 + cm��； 參考：《中國科學(xué):物理學(xué) 力學(xué) 天文學(xué)》2011年12期

【摘要】：宇宙中的中性氫原子產(chǎn)生波長為21cm的輻射,其強(qiáng)度在大尺度上正比于物質(zhì)密度.通過射電觀測這一輻射,可以獲得宇宙中物質(zhì)分布的大尺度結(jié)構(gòu).利用大尺度結(jié)構(gòu)功率譜中的重子聲波振蕩信號作為標(biāo)準(zhǔn)尺,可以進(jìn)行高精度的宇宙學(xué)測量,確定暗能量狀態(tài)方程參數(shù)w,這提供了一種重要的暗能量觀測手段.我國在射電天文及相關(guān)技術(shù)方面有一定基礎(chǔ),且國內(nèi)即有電磁環(huán)境良好的站址,有很好的條件開展這方面的研究.如能及時著手,有可能在這一領(lǐng)域中取得領(lǐng)先,并在暗能量研究中取得突破.本文介紹了通過21cm巡天對暗能量進(jìn)行觀測的方法,并討論了天籟計(jì)劃具體實(shí)驗(yàn)設(shè)想.
[Abstract]:Neutral hydrogen atoms in the universe produce radiation at the wavelength of 21cm, the intensity of which is proportional to the density of matter on a large scale.The large scale structure of matter distribution in the universe can be obtained by radio observation of this radiation.The baryon acoustic wave oscillation signal in the power spectrum of large scale structure can be used as a standard scale to carry out high precision cosmological measurements and to determine the parameters of the dark energy equation of state w, which provides an important means of dark energy observation.There is a certain foundation in radio astronomy and related technology in our country, and there are good sites for electromagnetic environment in China, so there are good conditions to carry out the research in this field.If done in time, it is possible to take the lead in this field and make a breakthrough in dark energy research.In this paper, the method of observing dark energy by 21cm survey is introduced, and the experimental idea of EarthSound plan is discussed.
【作者單位】： 中國科學(xué)院國家天文臺;北京大學(xué)高能物理研究中心;
【基金】：國家天文臺預(yù)研項(xiàng)目基金 國家重點(diǎn)基礎(chǔ)研究發(fā)展計(jì)劃(編號:2007CB8154010) John Templeton Beyond Horizons基金 國家自然科學(xué)基金(批準(zhǔn)號:11073024)資助項(xiàng)目
【分類號】：P161

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