Generalised model-independent characterisation of strong gravitational lenses – VI. The origin of the formalism intrinsic degeneracies and their influence on H0
Generalised model-independent characterisation of strong gravitational lenses – VI. The origin of the formalism intrinsic degeneracies and their influence on H0
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强引力透镜的广义模型无关表征 â VI 形式主义内在简并性的起源及其对 H0 的影响
DOI:
10.1093/mnras/stz1587
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发表时间:
2019
影响因子:
4.8
通讯作者:
J. Wagner
中科院分区:
文献类型:
--
作者:
J. Wagner
We give a physical interpretation of the formalism intrinsic degeneracies of the gravitational lensing formalism that we derived on a mathematical basis in part IV of this series. We find that all degeneracies occur due to the partition of the mass density along the line of sight. Usually, it is partitioned into a background (cosmic) density and a foreground deflecting object. The latter can be further partitioned into a main deflecting object and perturbers. Weak deflecting objects along the line of sight are also added, either to the deflecting object or as a correction of the angular diameter distances, perturbing the cosmological background density. A priori, this is an arbitrary choice of reference frame and partition. They can be redefined without changing the lensing observables that are sensitive to the integrated deflecting mass density along the entire line of sight. Reformulating the time delay equation such that this interpretation of the degeneracies becomes easily visible, we note that the source can be eliminated from this formulation, which simplifies reconstructions of the deflecting mass distribution or the inference of the Hubble constant,H0. Subsequently, we list necessary conditions to break the formalism intrinsic degeneracies and discuss ways to break them by model choices or including non-lensing observables such as velocity dispersions along the line of sight with their advantages and disadvantages. We conclude with a systematic summary of all formalism intrinsic degeneracies and possibilities to break them.
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DOI:
--
发表时间:
2011
期刊:
影响因子:
--
作者:
Walker Mills
通讯作者:
Walker Mills
影响因子:
6.5
作者:
O. Wertz;Bastian Orthen;P. Schneider
通讯作者:
P. Schneider
DOI:
10.1088/0004-637x/801/1/44
发表时间:
2015
期刊:
The Astrophysical Journal
影响因子:
--
作者:
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通讯作者:
L. Bradley
影响因子:
6.5
作者:
P. Schneider;D. Sluse
通讯作者:
D. Sluse
DOI:
--
发表时间:
2018
期刊:
影响因子:
--
作者:
L. Williams;J. Liesenborgs
通讯作者:
J. Liesenborgs