Typos in Statement of Purpose of PhD application. I am an International student, I applied to universities in US for PhD in High Energy Physics (theory). I just realized that I have made a couple of typos in my statement of purpose/writing sample. To be more specific, I repeated a word (like "year year" instead of "year") in two places. Due to anxiety of waiting to hear from universities, I am worried about all the factors that come into play. How much of a negative impact will this have on my application ? 

P.S. - I have done graduate level courses in quantum field theory and quantum electrodynamics. I have one publication in JHEP and decent GRE scores.
How significant a typo is rests largely on the purpose and the level of competition. If you were being considered for a prestigious fellowship, typos in the statement of purpose could and have been used as reasons to screen people out of the competition (because there were too many strong candidates).

For traditional admissions, on the other hand, while such sloppiness cannot help you, it's not normally severe enough issue to disqualify you, unless the typos become so numerous that they interrupt the flow of the writing.