What If Dark Matter Is Just Black Holes?

The video explores the hypothesis that dark matter could be composed of black holes, specifically primordial black holes formed in the early universe. It discusses the challenges of this theory, including the need for black holes to be abundant and spread out like dark matter. Various methods, such as microlensing, are used to test this hypothesis by ruling out certain black hole masses. The video concludes that while black holes are unlikely to account for all dark matter, the search for its true nature could lead to new physics.

What percentage of the universe's mass is considered to be dark matter?

• 20%

• 100%

• 80%

• 50%

What is one hypothesis for the composition of dark matter?

• Supernovae

• Black holes

• White dwarfs

• Neutron stars

What is a key requirement for black holes to be considered as dark matter?

• They must emit light

• They must be larger than the Sun

• They must be abundant and spread out

• They must be visible

What are primordial black holes thought to have formed from?

• Collisions of galaxies

• Density fluctuations in the early universe

• The collapse of neutron stars

• Supernova explosions

What is the effect called when a compact mass like a black hole magnifies a distant light source?

• Astrophysical distortion

• Light bending

• Micro lensing

• Gravitational pull

What are Machos in the context of dark matter?

• Massive Compact Halo Objects

• Microscopic Cosmic Halos

• Magnetic Cosmic Halos

• Massive Cosmic Halos

What percentage of the Milky Way Halo's mass might be dark, compact objects?

• 10%

• 20%

• 30%

• 40%

What is a potential consequence of a primordial micro black hole passing through a white dwarf?

• It would cool the star

• It would have no effect

• It would ignite a supernova

• It would cause the star to shrink

What is a plunk relic?

• A new particle

• A type of neutron star

• A type of galaxy

• A remnant of an evaporated black hole

What is the significance of discovering the true nature of dark matter?

• It will confirm existing physics

• It will open a window into new physics

• It will have no impact on science

• It will only affect astronomy