By the way, as a member of large experimental collaborations, I've worked with professional project managers.
On a science project like this, it's the scientists who decide what the goals and methods are. The collaboration founders (physicists) decided what experiment to do. They decided on the R&D needs, the components and their arrangement, the precision requirements, the computational tools. The collaboration board (physicists, again) actually perform the R&D, design the components, diagnose the components that turn out not to work, write the software, run the software, etc.
As far as I can tell, the project manager's role was to listen to the physicists and turn our statements into Gantt charts. They look at the Gantt charts and monitor for things that are on the critical path, or in danger of becoming so. The project manager says (very useful) things like "Hey, guys, the project plan assumes that Task #400 and Task #506 can take place simultaneously, but they both want to use Resource #66a full-time"; or "Task #101 has missed three of its declared milestones by 1.5 months. If milestone #4 slips by more than 2 months, it impacts the critical path. Fix that." Or "The physicists involved proposed declaring 3-month contingency window for Tasks #6-10 collectively, but experience with tasks #2-5 suggest this is inadequate. I will budget assuming at least one of tasks in this group will overrun, and assign a 10% chance that two will overrun."
The project manager did NOT make statements like "You're measuring top quarks? I prefer Higgs bosons, they sound important. I will add a 'discover Higgs boson' milestone and complain that you're failing to meet it."
Again, I don't think that your claim "There's a risk of failing to discover truths about space and time" is an authentic statement of risk management. You don't have a Gantt chart showing how and when spacetime-knowledge milestones might be reached. You don't know what tasks already underway are tied to spacetime-truths milestones. You don't know the probability of success of those tasks, nor the resource-allocation among them. You don't have a new task to add to the chart, nor any evidence that such new tasks would decrease the schedule risk.
If you want to convince me that you *do* have such things, please go ahead.