a Swedish actor called Alexander Karim
https://m.imdb.com/name/nm0992562/mediaviewer/rm4271234305/
ETA - oh sorry peeps didn't see/read any of the posts but the one quoting me asking for the name ;)
It says it's from the movie Radioactive and she is playing Marie Curie doesn't it?
But watching the trailer - her hair definitely isn't the same in both.