Constraints on cosmic opacity and beyond the standard model physics from cosmological distance measurements
Constraints on cosmic opacity and beyond the standard model physics from cosmological distance measurements
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DOI：
10.1088/1475-7516/2010/10/024
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发表时间：
2010-10-01
影响因子：
6.4
通讯作者：
Jimenez, Raul
中科院分区：
文献类型：
--
作者：
Avgoustidis, Anastasios;Burrage, Clare;Jimenez, Raul
我们通过结合最近的SNIa型数据和在0到2之间红移的哈勃展开的最新测量来更新对宇宙不透明度的约束。对参数epsilon参数的新的约束是epsilon=-0.04(-0.07)(+0.08)(2-sigma)。对于0.2%和0.35%之间的红移范围，这对应于不透明度T；0.012(95%C.L.)，比先前的约束强2倍。预测违反光子数守恒的超越标准模型物理的各种模型都会造成不透明度，并且可以同样受到限制。在这篇文章中，我们对类轴子粒子，包括变色龙和微小带电粒子提出了新的限制。
We update constraints on cosmic opacity by combining recent SN Type Ia data with the latest measurements of the Hubble expansion at redshifts between 0 and 2. The new constraint on the parameter epsilon parametrising deviations from the luminosity-angular diameter distance relation (d(L) = d(A)(1 + z)(2+epsilon)), is epsilon = -0.04(-0.07)(+0.08) (2-sigma). For the redshift range between 0.2 and 0.35 this corresponds to an opacity Delta tau < 0.012 (95% C. L.), a factor of 2 stronger than the previous constraint. Various models of beyond the standard model physics that predict violation of photon number conservation contribute to the opacity and can be equally constrained. In this paper we put new limits on axion-like particles, including chameleons, and mini-charged particles.