Merciful Ending

Diving into a black hole is a form of suicide, which may go against religious, moral, or ethical principles. Aside from such considerations, no one will volunteer for your black-hole diver research team if she predicts that her death at the crunch point will be painful. Your task is to estimate the ouch time Touch/ defined as the lapse of time on the wristwatch of the diver between the first discomfort and the arrival of the diver at the central crunch point, r = 0.

Figure 7 Computer plot Thin line: Worldline for rain diver that passes r = 5M at irajn = 0 and emits headlight and taillight flashes at event A inside the horizon. Thick lines: Worldlines for these inward and "outward" flashes. Both flashes move inward. The shaded region contains events the diver can still influence in the future as she passes event A.

r/ff

Figure 7 Computer plot Thin line: Worldline for rain diver that passes r = 5M at irajn = 0 and emits headlight and taillight flashes at event A inside the horizon. Thick lines: Worldlines for these inward and "outward" flashes. Both flashes move inward. The shaded region contains events the diver can still influence in the future as she passes event A.

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