论文标题
搜索具有SPTPOL极化数据的各向异性宇宙双折射
Searching for Anisotropic Cosmic Birefringence with Polarization Data from SPTpol
论文作者
论文摘要
我们提出搜索500摄氏度的各向异性宇宙双折射，在150 GHz观察到南极望远镜上的SPTPOL相机在150 GHz观察到。我们使用观察到的宇宙微波背景（CMB）$ e $和$ b $字段之间的高阶相关性重建宇宙极化旋转各向异性的地图。然后，我们测量该地图的角功率谱，该映射与零一致。非检测被转化为对尺度不变的宇宙旋转功率谱的幅度的上限，$ l（l+1）c_l^{ααα}/2π<0.10 \ times 10^{ - 4} $ rad $ rad $^2 $（0.033 $^2 $，95％C.L.）。该上限可用于对原始磁场的强度放置约束，$ b_ {1 \ rm mpc} <17 {\ rm ng} $（95％c.l.），以及Chern-simons的耦合常数，Chern-simons电磁项$ g_ g_ g_ g_ g_}aγ} <4.0 \ 4.0％\ 2 $ c. 2}/c. 2}/c. 2}/fr $ h_i $是通货膨胀的哈勃量表。我们还第一次将CMB温度波动与重建的旋转角度图交叉相关，这是在某些理论场景中预计不会呈现的信号，并且找不到可检测的信号。我们执行一系列系统学和一致性检查，找不到污染的证据。
We present a search for anisotropic cosmic birefringence in 500 deg$^2$ of southern sky observed at 150 GHz with the SPTpol camera on the South Pole Telescope. We reconstruct a map of cosmic polarization rotation anisotropies using higher-order correlations between the observed cosmic microwave background (CMB) $E$ and $B$ fields. We then measure the angular power spectrum of this map, which is found to be consistent with zero. The non-detection is translated into an upper limit on the amplitude of the scale-invariant cosmic rotation power spectrum, $L(L+1)C_L^{αα}/2π< 0.10 \times 10^{-4}$ rad$^2$ (0.033 deg$^2$, 95% C.L.). This upper limit can be used to place constraints on the strength of primordial magnetic fields, $B_{1 \rm Mpc} < 17 {\rm nG} $ (95% C.L.), and on the coupling constant of the Chern-Simons electromagnetic term $g_{aγ} < 4.0 \times 10^{-2}/H_I $ (95% C.L.), where $H_I$ is the inflationary Hubble scale. For the first time, we also cross-correlate the CMB temperature fluctuations with the reconstructed rotation angle map, a signal expected to be non-vanishing in certain theoretical scenarios, and find no detectable signal. We perform a suite of systematics and consistency checks and find no evidence for contamination.
