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I am a Physics undergrad who is interested in pursuing a PhD in pure maths in the future (algebraic geometry/topology) but I am a bit unsure. My question is quite general, and I don't wish to provide more background for fear of bias in the answers.

My question: Is it is advisable/possible/unfavorable/favorable to apply for a PhD in a field, different from that in which you have done most of your undergraduate research?

My research (includes just reading and understanding papers, writing summaries until now, I havent published anything) mostly includes Quantum field theory, and gauge theory. Would the selection committee turn down an application to a pure maths field, if I have no research experience whatsoever?

I would also like to ask the question other way round. What if I concentrate my undergraduate research SOLELY on topics in pure maths such as algebraic geometry/topology and take other physics courses, would I be able to apply to a string theory PhD with a high chance of success?

Should I consider spending time on both of these (which is almost an impossible task), to improve my chances in both the areas or would research in one area, and grad level courses in the other suffice?

In brief: Should the PhD field you are applying to be the same as your undergraduate research area?

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See this answer for a related discussion. –  eykanal Feb 11 '13 at 15:55
    
I thought we had covered this question somewhat in your previous question about recommendation letters. academia.stackexchange.com/questions/7870/… –  blackace Feb 12 '13 at 2:28
    
@blackace: I think that question is a bit different, as it asks about recommendation letters from physicists. So it maybe possible, that I get recommendation letters from mathematicians (under whom I have taken courses), but all my undergraduate research is in physics. Would it reduce my chances of getting into a good grad school? –  ramanujan_dirac Feb 12 '13 at 2:31

2 Answers 2

You can definitely apply in a different field than your undergraduate. Some major fields of research don't even exist as undergraduate majors in most colleges (e.g., neuroscience), so it's understood that many students will come from different backgrounds.

The more similar your major is to the new topic, the easier the learning curve. If your major is significantly different you may want to take some post-bachelors undergraduate courses before beginning the PhD program to bring yourself up to speed.

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You should do what makes you happy and you find interesting. PhD is a considerable investment and it is worthwhile only if you are highly interested in your research. It is quite common for people to change domain from undergrad to grad studies (between math/CS/physics/Bio-info).

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