Equivalency Principle (which is the foundation of General Relativity) says gravity and acceleration are physically completely equivalent. Let's also consider that acceleration towards speed of light produces Unruh Radiation. Then one must conclude that, Black Holes also should produce Unruh Radiation, since their gravity (escape velocity) increases towards speed of light, when approaching near their Event Horizon.
But then, a BH produces both Hawking Radiation and Unruh Radiation?
IMHO, all physical mechanisms I read about for, how exactly Hawking Radiation is produced, seem lacking. So I think it is quite possible that, BHs actually produce only Unruh Radiation.
I think it is generally thought that, even if it is real, Hawking Radiation around any real BH, can never be actually detected by us, using any tech. What about possibility of detecting Unruh Radiation, instead? (I have no idea.)
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