My thesis concerns the relationship between Economics and political power.
My graduate work deals with the relationship between Economics and political power.
My thesis is about the relationship between Economics and political power.
・My thesis concerns the relationship between Economics and political power.
こちらは「について」のニュアンスを強調しています
・My graduate work deals with the relationship between Economics and political power.
こちらは「これについて研究したり、論文書いたりしています」の意味を伝わります
・My thesis is about the relationship between Economics and political power.
こちらは「について」の直訳ですね。I'm ～｛動詞｝ about ～｛名詞｝が一番 味 がない分ですがね
オーストラリア 
