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<blockquote data-quote="Umbran" data-source="post: 2406568" data-attributes="member: 177">My work is more in mathematical and simulations, but I'm reasonably familiar with the cosmology.I'd put it this way - the data are mostly consistent with it being a negative energy density, but it is also consistent with other explanations.&nbsp; I haven't myself seen any models use the negative energy density that also predict somethign else unrelated and get it right.&nbsp; A model that predicts only what it is specifically designed to predict isn't much of a model.The other way I've come to think of it is rather like QM - we have math that predicts, but we also have interpretations of what the math actually means, like the Copenhagen Interpretation of QM.&nbsp; For a few of the cosmological models, you have math that gets the right results, and then comes the question of interpretation - and depending how you manipulate it, you can interpret it as negative energy density, or as a cosmological constant that &quot;just is&quot;.</blockquote>

[QUOTE="Umbran, post: 2406568, member: 177"] My work is more in mathematical and simulations, but I'm reasonably familiar with the cosmology. I'd put it this way - the data are mostly consistent with it being a negative energy density, but it is also consistent with other explanations. I haven't myself seen any models use the negative energy density that also predict somethign else unrelated and get it right. A model that predicts only what it is specifically designed to predict isn't much of a model. The other way I've come to think of it is rather like QM - we have math that predicts, but we also have interpretations of what the math actually means, like the Copenhagen Interpretation of QM. For a few of the cosmological models, you have math that gets the right results, and then comes the question of interpretation - and depending how you manipulate it, you can interpret it as negative energy density, or as a cosmological constant that "just is". [/QUOTE]

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