Lawrence Krauss - Why is Quantum Gravity So Significant?

Quantum theory explains how particles and fields work. General relativity, discovered by Einstein, explains how gravity generates the structure of the universe. But the two great theories of physics and cosmology are not compatible. But this is impossible because both describe reality. Only a solution to quantum gravity can solve the huge problem.



Lawrence Maxwell Krauss is a Canadian-American theoretical physicist and cosmologist who is a Foundation Professor of the School of Earth and Space Exploration, and director of the Origins Project at Arizona State University


Closer to Truth, hosted by Robert Lawrence Kuhn and directed by Peter Getzels, presents the world’s greatest thinkers exploring humanity’s deepest questions. Discover fundamental issues of existence. Engage new and diverse ways of thinking. Appreciate intense debates. Share your own opinions. Seek your own answers.

[jonnekjonneksson]

Please, please, start adding to the description of your videos the date (even just the year) of the production. For some people who value your efforts and are in the field of physics research is extremely crucial. Thank you.

[emmettedavidson]

For those looking for an interview date, it's apparently 2012. Note that at around 7:00 he references a certain "last year" Nobel Prize (must be 2011 Physics: accelerating universe anomaly).

[vanrozay]

I appreciate this series because the interviewer is smart enough and up on developments enough to get the most out of his sources. Good for Robert Kuhn. Sometimes I even understand at least a bit of what is said, despite my cerebral feebleness . Lawrence Krauss is an agreeable explainer, always enjoyable to see/hear. Thanks, guys.

[gustavderkits]

Everyone should read Ted Jacobson’s 1995 paper, ”Thermodynamics of Spacetime: The Einstein Equation of State”. The key line is, “By analogy, the viewpoint developed here suggests that it may not be correct to canonically quantize the Einstein equations, even if they describe a phenomenon that is ultimately quantum mechanical.” Freeman Dyson said he had calculated that a detector sensitive enough to sense a single graviton would have so much mass that it would collapse into a black hole. He speculated that gravity is intrinsically classical. The search for quantum gravity may be fruitless. We need someone of the caliber of Kurt Goedel to show that. We’re still waiting for Goedel.

[cchanc]

LKrauss here's why I appreciate you. your style of speech makes it possible and even easy to follow what you're saying for my non-physicist mind. some others in your field speak and my eyes gloss over.

[thomasyunick]

Understanding the "Scale" is forever know past benchmarks and must anticipate future ones from past measurements...no one can keep up with the rate of expansion otherwise.

[BG-fmod]

It is deceptive of this channel not to add a date for a science video. Science knowledge is evolving exponentially. This interview is old and out of date and to load it 1 day ago… without the date for context is deceptive.

[dabrownone]

Theories that explain paradoxes that dont seem particularily relevent often introduce concepts that totally change how we understand the universe and do far more than explain away the initial motivating paradox

[chriskelvin]

Fascinating conversation that totally diverted my attention from noticing that it took place at Blue Lagoon!!!! I visited that magical place in June and just didn't make the connection until Mr. Krauss noted the location was Iceland- then, bam! The never-ending hot springs!!! If only a scientific epiphany had hit me as well, but I will leave that for bigger brains...

[doodelay]

Lot of wisdom popping off Lawrence Krauss in this chat

[childfreesingleandatheist]

I thought the general consensus was about 100 billion galaxies in the universe. I guess that was a long time ago. Now, it's about 400 billion. Each galaxy can have 100-400 billion planets, if not more. And it all started in a singularity point. Truly mind-blowing.

[macphin]

I don't know where this was recorded, but what a strange venue for this discussion.

[dahur]

What was before the beginning.? And what was before that...and before that..? It's truly mind boggling. It'll drive you nuts to think about it.

[arkdark]

The great Lawrence Krauss. It’s always fascinating to listen to you.

[tekannon]

First I would like to than Mr Khune and his gifted interviewees for their contribution to the common person the knowledge only they possess. No one can deny that his fabulous vocasts (videocasts) in 2021have enlightened many people across the world to the wonderful world of physics. I only wish I could understand a lot of what's being said by the bevy of heavy-hitters in worlds away prophets like Lawrence Krauss, but there is always something I take away from each interview from the very complex field of physics. We also all of you in science and all the health professionals in the world a great Holiday Season and New Year's celebration and a very good New Year 2022. Mr Khune, you make YouTube a masterclass of learning possibilities. Thank you Mr Krauss for your bubbling contageous enthusiasm for the worlds away from ours and the star plans that defy the laws of physics at this writing.

[CristinaG]

I'll be looking forward to hoverboards once they figure it out..!! 😂 🤣

[antonleimbach]

I’ve been casually wondering about this for decades and this video explained it to me in minutes.

[dougsherman]

Very nice discussion, much appreciated. The Gravity question.

[trevorgwelch]

Q : How does quantum gravity effect the space/time continuum ? Thank You .

[Sithdestroyer]

I'm confused by what you mean Einstein relied on great experiments to come up with General Relativity and that science does not come from people thinking in a room. Einstein was renowned for his "thought experiments" which requires thinking in a room and that is what he used to describe General Relativity to the people around him and support his hypothesis. The experimental data that came after is what validated his hypothesis and what transformed General Relativity into our best understanding of the Theory of Gravity. A better way of putting it is that thinking is what gives you a hypothesis and experimenting is what validates your hypothesis to make it a theory.