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Natural Science Forum / Physics / Research / November 2004Einstein and Lambda
Question. There are some who claim that DE as a scalar field resolves the " missing mass " problem, but as the DE force is repulsive how could that account for galactic cohesion which is attractive? ------------------------------------------------------------------------ This post submitted through the LaTeX-enabled physicsforums.com To view this post with LaTeX images: http://www.physicsforums.com/showthread.php?t=50342#post357187 Good question, simple answer. DE is strong on extragalactic scales, gravity completely swamps it at the local galactic and say everyday life scale. ------------------------------------------------------------------------ This post submitted through the LaTeX-enabled physicsforums.com To view this post with LaTeX images: http://www.physicsforums.com/showthread.php?t=50342#post357572 So then you think that DE would follow sort of an inverse of Newtons square of the distance or it is a scaler field ( as I believe) where the gradient doesn't change , but is rather static. Even a small force differential at great distances would have an effect over the age of the universe? I.E. The fact that the outer bodies are accelerating because the FGrav is less over greater distances. That still doesn't account for the cohesive behavior of Galaxy's. With the mass we measure they should fly apart. So there must be something we cannot see of measure ATT. CDM or HDM. The invocation of DE can solve the overall energy budget, but can't account for missing mass at close distances. ------------------------------------------------------------------------ This post submitted through the LaTeX-enabled physicsforums.com To view this post with LaTeX images: http://www.physicsforums.com/showthread.php?t=50342#post358909 > Question. > There are some who claim that DE as a scalar field resolves the " > missing mass " problem, but as the DE force is repulsive how could that > account for galactic cohesion which is attractive? You are confusing curve fitting for spiral galaxy persistence (dark matter, attraction) with curve fitting for excess universal expansion (dark energy, repulsion). There comes a time when adding more epicycles (perturbative approaches) is less attractive than formulating better overall theory.  SignatureUncle Al http://www.mazepath.com/uncleal/ (Toxic URL! Unsafe for children and most mammals) http://www.mazepath.com/uncleal/qz.pdf |
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