Understanding Black Holes and Cosmic Censorship

What does the cosmic censorship hypothesis propose about singularities?

• They are always visible.

• They are the same as black holes.

• They do not exist.

• They are always hidden by event horizons.

Which property is NOT one of the three that black holes can have according to the no-hair theorem?

• Mass

• Electric charge

• Temperature

• Spin

What happens to the event horizons of a Kerr black hole as its spin increases?

• They become more visible.

• They remain unchanged.

• They expand indefinitely.

• They merge and vanish.

What is a characteristic of an extremal black hole?

• It has no mass.

• It has the maximum spin or charge while still having an event horizon.

• It emits no radiation.

• It is always visible.

Why can't rotating black holes become extremal through Hawking radiation?

• They are unaffected by Hawking radiation.

• They gain mass from Hawking radiation.

• They lose angular momentum as well as mass.

• They do not emit Hawking radiation.

What prevents a black hole from gaining angular momentum from accretion when it is nearly extremal?

• The black hole loses mass too quickly.

• The gas near the event horizon has no angular momentum of its own.

• The event horizon expands too rapidly.

• The black hole repels all matter.

What happens to a charged black hole in the presence of matter?

• It becomes more charged.

• It becomes a naked singularity.

• It loses its charge completely.

• It quickly neutralizes.

What is the purpose of embedding diagrams in the context of black holes?

• To show the size of black holes.

• To measure the temperature of black holes.

• To calculate the mass of black holes.

• To represent the strength of spatial curvature.

What does conformal cyclic cosmology suggest about the universe?

• The universe is expanding indefinitely.

• The universe is static and unchanging.

• The universe undergoes a series of cycles or aeons.

• The universe will eventually collapse.

In conformal cyclic cosmology, what can pass from one universe to the next?

• Photons and gravitational waves

• Only energy

• Only matter

• Nothing can pass