We’ve known for a while that Jane Foster (Natalie Portman), the astrophysicist who also happened to be Thor’s love interest in the God of Thunder’s first two movies, was not appearing in Thor: Ragnarok. At first, Marvel’s answer was simply that most of the movie wouldn’t take place on Earth, where humans like Jane…
Source: io9 – Marvel’s Explanation for Jane Foster’s Absence in Thor: Ragnarok Has Taken a Turn