Population axiology (Hillary Greaves, 2017)
Infinite ethics (Nick Bostrom, 2003)
Population ethics and inaccessible populations (Carl Shulman, 2014)
Moral uncertainty about population axiology (Hilary Greaves and Toby Ord, 2017)
Pareto principles in infinite ethics (Amanda Askell, 2018)
Utilitarianism, decision theory, and eternity (Frank Arntzenius, 2014)
Problems and solutions in infinite ethics (Ben West, 2015)
EA reading list: population ethics, infinite ethics, anthropic ethics
Start here:
Population axiology (Hillary Greaves, 2017)
Infinite ethics (Nick Bostrom, 2003)
Further reading:
Population ethics and inaccessible populations (Carl Shulman, 2014)
Moral uncertainty about population axiology (Hilary Greaves and Toby Ord, 2017)
Pareto principles in infinite ethics (Amanda Askell, 2018)
Utilitarianism, decision theory, and eternity (Frank Arntzenius, 2014)
Problems and solutions in infinite ethics (Ben West, 2015)