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A post doc in an area that differs from my PhD?

I am currently doing a PhD in fluid mechanics but want to do mathematical physics tbh. In another thread I got an answer about a user who had done a PhD in accelerator physics and went to do a post-doc in condensed matter, vice versa even, but in their case, it seemed like it was largely about there being specific connections between the two that were desired at the times,

I've read around other cases, e.g one in biology where the areas did not relate in such a way (or so that's the impression that comes across on a first read of the story), and where in this case the student mentions how she read a lot more of this other subject she ended up going to do a post-doc in, than her current PhD topic.

But my question is, despite everyone in this forum saying otherwise, that mathematical physics programmes are harder to get into than applied maths, and, if one wasn't considered a good enough candidate to be offered a position in mathematical physics to start with- for a PhD- why would they then be for the case of a post-doc? I mean with the biology story above, I do not know about the fields enough to guess whether the situation would have been this - her grades were strong enough in the first place.

I mean having a PhD in a different area is definitely not going to make you a stronger candidate, would be my guess, would that be correct? In which case, would I be better of dropping out and going for a Mres in mathematical physics, hope to get a publication or two, which would make me a significantly stronger candidate I guess, and I would also guess with publications prior degrees would not matter as much or? Many thanks for your help

I am currently doing a PhD in fluid mechanics but want to do mathematical physics tbh. In another thread I got an answer about a user who had done a PhD in accelerator physics and went to do a post-doc in condensed matter, vice versa even, but in their case, it seemed like it was largely about there being specific connections between the two that were desired at the times,

I've read around other cases, e.g one in biology where the areas did not relate in such a way (or so that's the impression that comes across on a first read of the story), and where in this case the student mentions how she read a lot more of this other subject she ended up going to do a post-doc in, than her current PhD topic.

But my question is, despite everyone in this forum saying otherwise, that mathematical physics programmes are harder to get into than applied maths, and, if one wasn't considered a good enough candidate to be offered a position in mathematical physics to start with- for a PhD- why would they then be for the case of a post-doc? I mean with the biology story above, I do not know about the fields enough to guess whether the situation would have been this - her grades were strong enough in the first place.

I mean having a PhD in a different area is definitely not going to make you a stronger candidate, would be my guess, would that be correct? In which case, would I be better of dropping out and going for a Mres in mathematical physics, hope to get a publication or two, which would make me a significantly stronger candidate I guess, and I would also guess with publications prior degrees would not matter as much or? Many thanks for your help

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