Constrained correlation functions from the Millennium Simulation
Constrained correlation functions from the Millennium Simulation
复制标题
千年模拟中的约束相关函数
DOI:
10.1051/0004-6361/201525906
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发表时间:
2015
期刊:
影响因子:
--
通讯作者:
Schneider
中科院分区:
文献类型:
--
作者:
Wilking;Röseler;Schneider
ContextIn previous work, we developed a quasi-Gaussian approximation for the likelihood of correlation functions that incorporates fundamental mathematical constraints on correlation functions, in contrast to the usual Gaussian approach. The analytical computation of these constraints is only feasible in the case of correlation functions of one-dimensional random fields.AimsIn this work, we aim to obtain corresponding constraints in the case of higher dimensional random fields and test them in a more realistic context.MethodsWe develop numerical methods of computing the constraints on correlation functions that are also applicable for two- and three-dimensional fields. To test the accuracy of the numerically obtained constraints, we compare them to the analytical results for the one-dimensional case. Finally, we compute correlation functions from the halo catalog of the Millennium Simulation, check whether they obey the constraints, and examine the performance of the transformation used in the construction of the quasi-Gaussian likelihood.ResultsWe find that our numerical methods of computing the constraints are robust and that the correlation functions measured from the Millennium Simulation obey them. Even though the measured correlation functions lie well inside the allowed region of parameter space, i.e., far away from the boundaries of the allowed volume defined by the constraints, we find strong indications that the quasi-Gaussian likelihood yields a substantially more accurate description than the Gaussian one.
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影响因子:
6.5
作者:
Martin;Schneider
通讯作者:
Schneider
影响因子:
6.5
作者:
Wilking;Schneider
通讯作者:
Schneider
DOI:
10.1088/0004-637x/746/2/172
发表时间:
2011
期刊:
The Astrophysical Journal
影响因子:
--
作者:
A. Labatie;J. Starck;M. Lachièze‐Rey
通讯作者:
M. Lachièze‐Rey
DOI:
--
发表时间:
1993
期刊:
影响因子:
--
作者:
U. Seljak;E. Bertschinger
通讯作者:
E. Bertschinger
影响因子:
6.5
作者:
J. Hartlap;T. Schrabback;P. Simon;P. Schneider
通讯作者:
J. Hartlap;T. Schrabback;P. Simon;P. Schneider