They have no idea, but they take our grant money, and have to say something. They get together and have meetings about what direction to take their theories, with the number one criterion being the maximization of grants. They are fools. Expensive, egotistical fools. What they say is lies.
They don’t even know if Einstein’s equations are correct out to the “limits”. They just assume. And get grants.
And when they get senile, they become “Discover Channel Commentators”.
Arrogant fools.
I take it you live in one of those alternate multiverses they talk about?