束缚暗能量的重子物理层析弱透镜的自校正
Self Calibration of Tomographic Weak Lensing for the Physics of Baryons to Constrain Dark Energy
摘要：
数值研究表明，重子物理的治疗中的不确定性，可以影响剪切功率谱的预测在一个水平，这是显着的即将到来的调查，如DES，SNAP，和LSST。相应地，我们表明重子效应可以显着偏置的暗能量参数测量。通过忽略超过几百个多极中的信息来消除这样的偏差，与使用几千个多极的信息相比，导致大约2到3倍的更弱的参数约束。幸运的是，同样的数值研究，探讨重子的影响表明，他们主要是通过改变晕结构，通过晕质量和平均有效晕浓度之间的关系影响功率谱。我们探索未来的弱透镜调查约束的内部结构的晕和暗能量的属性，同时作为第一步，对重子物理学的自校准的能力。这大大减少了参数偏差，并且在LSST的情况下没有参数约束退化超过40%，在SNAP或DES的情况下没有参数约束退化超过30%。适度的晕浓度关系的先验知识大大改善甚至这些预测。此外，我们发现，这些测量可以将有效晕浓度限制在m~10^14 Msun/h和z~0.2附近，仅用剪切功率谱就可以将有效晕浓度限制在10%以上。这些结果表明，推断暗能量参数与剪切功率谱的测量可以强大的重子效应，同时可能是竞争力与其他方法，告知模型的星系形成。（节录）
英文摘要：
Numerical studies indicate that uncertainties in the treatment of baryonic physics can affect predictions for shear power spectra at a level that is significant for forthcoming surveys such as DES, SNAP, and LSST. Correspondingly, we show that baryonic effects can significantly bias dark energy parameter measurements. Eliminating such biases by neglecting information in multipoles beyond several hundred leads to weaker parameter constraints by a factor of approximately 2 to 3 compared with using information out to multipoles of several thousand. Fortunately, the same numerical studies that explore the influence of baryons indicate that they primarily affect power spectra by altering halo structure through the relation between halo mass and mean effective halo concentration. We explore the ability of future weak lensing surveys to constrain both the internal structures of halos and the properties of the dark energy simultaneously as a first step toward self calibrating for the physics of baryons. This greatly reduces parameter biases and no parameter constraint is degraded by more than 40% in the case of LSST or 30% in the cases of SNAP or DES. Modest prior knowledge of the halo concentration relation greatly improves even these forecasts. Additionally, we find that these surveys can constrain effective halo concentrations near m~10^14 Msun/h and z~0.2 to better than 10% with shear power spectra alone. These results suggest that inferring dark energy parameters with measurements of shear power spectra can be made robust to baryonic effects and may simultaneously be competitive with other methods to inform models of galaxy formation. (Abridged)
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