Juan Maldacena - What Do Black Holes and Dark Matter Reveal?

Visit the 'dark side' of the universe. Black holes cannot be seen because gravity is so strong that not even light can escape. Dark matter cannot be seen because its particles hardly interact with ordinary matter. What is the meaning of the dark side?

[pielcee]

The way he smiles with his eyes, and his contagious way to be interested in these concepts reminds me a little of Richard Feynman.

[honestmicky]

Thank you for this excellent video. I love your channel : )

[lindsayforbes]

Muy bien Jaun. First time I even thought I understood this stuff gracias.

[psmoyer]

Very enlightening to listen to this interview juxtaposed to Smolin's black holes as needed universes interview. Diametrically opposed resilts.

[jamesruscheinski]

would any quantum gravity be from at or near the center of black hole?

[javiersoto]

So spacetime can be thought of as an emergent property of the interaction of particles? :o mind blown

[jamesruscheinski]

on the surface area at the event horizon of black hole, might quantum information be measured into classic particles? in which case the thermal Hawking radiation has or consists of quantum information?

[jamesruscheinski]

at the event horizon of black hole, does space become time? would an event horizon composed of time be a firewall to everything except time?

[jamesruscheinski]

Is the entropy of black hole mostly at the surface / horizon?

[jamesruscheinski]

Is the singularity of black hole similar to conditions at start of universe? If so, could black holes be pockets with potential to start small universes?

[travisfitzwater]

Respectfully, may I suggest we say Spacetime "stretches" instead of "curves." (The effect is the same).

[jamesruscheinski]

Does the mass pulled into singularity at center of black hole all become energy? With positive density?

[rambiss]

Gravitons escape? How does gravity escape from a black hole?

[jamesruscheinski]

Is there quantum gravity from horizon to center of black hole / singularity?

[jamesruscheinski]

Would quantum effects and gravity be pulled into center of black hole? Does the center of black hole / singularity give off energy outside black hole, perhaps even inflation to start new universe?

[helenbostock]

How hot are they on the surface and is it cooler inside. Question I like answer

[jamesruscheinski]

time falling into black hole becomes space of quantum wave mechanics into center of black hole?

[fahimullah]

Voldemort is a physicist. Wow. The best physicist, some say.

[jamesruscheinski]

Does quantum information of objects falling into black hole, stay on the surface / horizon of black hole, from where there is Hawking radiation?

[charlesbrightman]

At about 0:20 in the video he talks about 'space time' curving.
What exactly is 'space' that it can curve?
What exactly is 'time' that it can curve?