Cosmological systematics beyond nuisance parameters: form-filling functions
Cosmological systematics beyond nuisance parameters: form-filling functions
复制标题
超越干扰参数的宇宙系统学:表格填写函数
DOI:
10.1111/j.1365-2966.2009.15408.x
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发表时间:
2009
影响因子:
4.8
通讯作者:
Kitching T
中科院分区:
文献类型:
--
作者:
Kitching T
In the absence of any compelling physical model, cosmological systematics are often misrepresented as statistical effects and the approach of marginalizing over extra nuisance systematic parameters is used to gauge the effect of the systematic. In this article, we argue that such an approach is risky at best since the key choice of function can have a large effect on the resultant cosmological errors.As an alternative we present a functional form-filling technique in which an unknown, residual, systematic is treated as such. Since the underlying function is unknown, we evaluate the effect of every functional form allowed by the information available (either a hard boundary or some data). Using a simple toy model, we introduce the formalism of functional form filling. We show that parameter errors can be dramatically affected by the choice of function in the case of marginalizing over a systematic, but that in contrast the functional form-filling approach is independent of the choice of basis set.We then apply the technique to cosmic shear shape measurement systematics and show that a shear calibration bias of |m(z)| ≲ 10−3(1 +z)0.7is required for a future all-sky photometric survey to yield unbiased cosmological parameter constraints to per cent accuracy.A module associated with the work in this paper is available through the open sourceicosmocode available at http://www.icosmo.org.
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DOI:
10.1111/j.1365-2966.2006.11315.x
发表时间:
2006-08
影响因子:
4.8
作者:
R. Massey;C. Heymans;J. Bergé;G. Bernstein;S. Bridle;D. Clowe;H. Dahle;R. Ellis;T. Erben
通讯作者:
R. Massey;C. Heymans;J. Bergé;G. Bernstein;S. Bridle;D. Clowe;H. Dahle;R. Ellis;T. Erben
DOI:
--
发表时间:
2006
期刊:
影响因子:
--
作者:
A. Taylor;T. Kitching;D. Bacon;A. Heavens
通讯作者:
A. Heavens
DOI:
--
发表时间:
2005
期刊:
Tamsui Oxford Journal of Mathematical Science 21
影响因子:
--
作者:
Y. Yoshida;M. Yasuda;J. Nakagami and M. Kurano;S. Iwamoto;S. Iwamoto;K. Nomakuchi;S. Niizeki;S. Niizeki
通讯作者:
S. Niizeki
DOI:
--
发表时间:
2007
期刊:
影响因子:
--
作者:
A. Mekjian
通讯作者:
A. Mekjian
DOI:
10.1103/physrevd.54.1332
发表时间:
1995
期刊:
Physical review. D, Particles and fields
影响因子:
--
作者:
G. Jungman;M. Kamionkowski;A. Kosowsky;D. Spergel
通讯作者:
D. Spergel