These theories predict multiverse and multiverse is not falsifiable So Is it more accurate to call them just hypotheses?
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Why don't we call string, inflation theories just hypotheses?
All physics theories are mathematical models of measurements and observations and are predictive for new measurements and observations. Each theory is a hypothesis which has to be validated by new data, or if it is falsified a new model has to be found.
The inflation theories model the data from astrophysics, and are successful in building up the Big Bang model. Certainly there are predictions which cannot be validated, but at the present time it is a well validated model within our observational powers.
String theories are at the research level, are mainly pursued because quantization of gravity presents no problem within these theories, and they are flexible enough to embed the standard model of particle physics (a lot of data modeled by it). They are at the research level, because no fixed standard string theory model has appeared yet.
