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Originally Posted by CraigS
Just thought of another point …
If the effects of something exist and are real, can we infer that its causes are therefore real, also ?
Ie: the cause of comic expansion/acceleration is 'dark energy', therefore we can infer that dark energy is real, because expansion is real (measurable).
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If someone knocks on my front door part of the energy is converted into sound energy. Since this is based on sound physics I can infer the effect is very real. It doesn't tell me anything about the identity of the person knocking on my door. The causes remain an open question.
The acceleration of the Universe on the basis of type 1 supernova survey isn't unanimously accepted by cosmologists. Some papers have come out (these escape me for the time being) which suggest the survey results could be explained for an inertia based dark energy free expanding Universe.
In this case the question arises is the effect real.
The WiggleZ survey makes this question less relevant.
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PS: I think the BAO measurement in this case was achieved at a highest redshift of z = 0.6. I think the best achieved prior to this was z=0.2 and z=0.35 (?)
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We already know what happens with Quasar surveys that are "incomplete".
Selection effects leading to perceived patterns that pseudoscience likes to exploit.
Regards
Steven