Constraints on supersymmetric hybrid inflation models
Constraints on supersymmetric hybrid inflation models
复制标题
超对称混合通货膨胀模型的约束
DOI：
10.1088/1475-7516/2006/09/007
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发表时间：
2006
影响因子：
6.4
通讯作者：
A. Moss
中科院分区：
文献类型：
--
作者：
R. Battye;B. Garbrecht;A. Moss
我们指出，在大尺度上加入对CMB功率谱幅度贡献约5%的弦分量，可以增加CMB实验测量的密度起伏的谱指数ns的优选值。虽然这一发现适用于任何涉及弦的宇宙学场景，但我们特别考虑了超对称混合暴涨模型，该模型预测了当弦不包括在内时，与CMB数据的紧张关系。利用MCMC分析，我们约束了F项和D项通货膨胀所允许的参数空间。对于F项模型，利用最小超重力改正，我们得到对数κ=−为2.34±0.38，M=(0.518±0.059)×1016GeV。包含非最小超重力改正可以在一定程度上修改这些值。在对D期通货膨胀的相应分析中，我们得到了对数κ=−为4.24±0.19，MFI=(0.245±0.031)×1016GeV。在假设这些模型是正确的情况下，这些结果代表了对大统一理论重要参数的精确测量。我们从弦产生的引力波的随机背景出发，考虑了测量中可能存在的不确定性，以及对场景的附加约束。最佳拟合模型预测B模偏振信号≈为0.3μK rms时达到峰值。由于绝热E模信号在这些尺度上的引力透镜，这与预期信号的幅度相当。
We point out that the inclusion of a string component contributing around 5% to the CMB power spectrum amplitude on large scales can increase the preferred value of the spectral index ns of density fluctuations measured by CMB experiments. While this finding applies to any cosmological scenario involving strings, we consider in particular models of supersymmetric hybrid inflation, which predict , in tension with the CMB data when strings are not included. Using MCMC analysis we constrain the parameter space allowed for F- and D-term inflation. For the F-term model, using minimal supergravity corrections, we find that logκ = −2.34 ± 0.38 and M = (0.518 ± 0.059) × 1016 GeV. The inclusion of non-minimal supergravity corrections can modify these values somewhat. In the corresponding analysis for D-term inflation, we find logκ = −4.24 ± 0.19 and mFI = (0.245 ± 0.031) × 1016 GeV. Under the assumption that these models are correct, these results represent precision measurements of important parameters of a grand unified theory. We consider the possible uncertainties in our measurements and additional constraints on the scenario from the stochastic background of gravitational waves produced by the strings. The best fitting model predicts a B-mode polarization signal ≈0.3 μK rms peaking at . This is of comparable amplitude to the expected signal due to gravitational lensing of the adiabatic E-mode signal on these scales.