The phrase "information vacuum" means a lack or absence of important information or knowledge about a specific topic or situation. It suggests that there is a gap in understanding due to missing or insufficient information. Full definition
Private sector entrepreneurs have sought to fill the quality information vacuum. (slaw.ca)
This perceived information vacuum is allegedly borne... (asiapacific.ca)
It seems every few weeks, optimism turns to pessimism and back to optimism again before retreating into a temporary information vacuum, and then resurfacing at either end of the queasiness spectrum, depending on one's industry or market segment. (business.financialpost.com)