# Frame drag of event horizons

I was having a discussion with a friend and he brought up that you could float into an event horizon and not know that you had gone in. I believed this only works with a Schwarzschild black hole. He specified a very very large black hole with a large Event Horizon. My contention was that frame drag will not allow anything to enter an event horizon that has not been reduced to the most basic components. Just looking for commentary or equations that would be appropriate. Please don't leave an equation in the dark. I am old and trying to expand my horizons... pun intended. Any help would be appreciated.

It's ok. I solved it. If you leave this up I will come back to put in the answer.

• Why would frame dragging reduce anything to its most basic components? – mmeent Nov 1 at 8:13
• Frame dragging is present only in Kerr geometry that arises due to the $g_{t\phi}$ term in the metric. In Schwarzschild geometry there is no frame dragging. – Richard Nov 1 at 9:33
• Jason, I assume that you are asking about massive black holes with spin. If so, you should make that explicit in your question. FWIW, large black holes tend to have a lot of spin, as shown in the diagram at the end of this answer on the Astronomy site. – PM 2Ring Nov 1 at 12:58