I need some constructive advice about my dissertation topic. I am literally just

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I need some constructive advice about my dissertation topic. I am literally just starting out my research. Though I won't be starting for another year or so, it's an extensive topic and I could use some advice to make sure the basic idea and outline is sound. Thing is, the few professors in my department who work in this area don't want to be bothered, so I'm stuck. I'd like to email about, but I'm not sure if that's allowed on this site?