DAVOS, Switzerland, Jan 16 - The chief executive of Norway's $1.5 trillion sovereign wealth fund, the world's largest, told Reuters on Tuesday the fund's return on investments would likely be "slow" in 2024 due to high interest rates, persistent inflation and geopolitical risk. (Reporting by Divya Chowdhury in Davos and Gwladys Fouche in Oslo, editing by Terje Solsvik)