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SimmieKay
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I have been learning about the different interpretations of QM, and I am trying to build a taxonomy of them in my mind (I find that trying to build taxonomies is a good way of learning about things). I have read about collapse theories and non-collapse theories. If I have got this right, the former accept the idea of the collapse of the wave function, even as they disagree about what exactly causes it; while the later argue that the concept of the wave function collapsing is better dispensed with. As I understand it, examples of collapse theories include subjective collapse theories, principally von Neumann-Wigner; and objective collapse theories, such as Ghirardi-Rimini-Weber theory and the Penrose interpretation; while examples of non-collapse theories include the various hidden variable theories, and many worlds. (Please correct me if I have got any of this wrong.)
My question then is whether Copenhagen interpretation should be classified as a collapse theory or a non-collapse theory, or is it some third type of interpretation which doesn't fit neatly into either classification? I would think that since it affirms that the wave function collapses, it is a collapse theory. But, if it is a collapse theory, is it an objective collapse theory, a subjective collapse theory, or some further type of collapse theory which does not fit under either the "objective" or "subjective" labels?
(PS: This is my first post, and I am not sure what the right value for "thread level" is. I picked high school because that is the highest level of physics I have formally studied, even though for me high school was over 15 years ago. I'd prefer accuracy in answers - even if they are challenging to understand - to simplification.)
My question then is whether Copenhagen interpretation should be classified as a collapse theory or a non-collapse theory, or is it some third type of interpretation which doesn't fit neatly into either classification? I would think that since it affirms that the wave function collapses, it is a collapse theory. But, if it is a collapse theory, is it an objective collapse theory, a subjective collapse theory, or some further type of collapse theory which does not fit under either the "objective" or "subjective" labels?
(PS: This is my first post, and I am not sure what the right value for "thread level" is. I picked high school because that is the highest level of physics I have formally studied, even though for me high school was over 15 years ago. I'd prefer accuracy in answers - even if they are challenging to understand - to simplification.)