Kim, Manki2021-12-202021-12-202021-08Kim_cornellgrad_0058F_12550http://dissertations.umi.com/cornellgrad:12550https://hdl.handle.net/1813/110580416 pagesThis thesis is mostly concerned with two questions: Is it possible to construct de Sitter solutions in string theory? How do strings make up spacetime in string theory? In this thesis, modest progress along those two directions is reported.enAttribution-NonCommercial-ShareAlike 4.0 InternationalCosmologyString theorydissertation or thesishttps://doi.org/10.7298/w271-7y72