A New Contender Is Here!

Is Loop Quantum Gravity better than String Theory?
In the last days of his life, Albert Einstein remained vexed by a problem he had devoted so much of his life to: how to reconcile his Theory of General Relativity with the emerging field of Quantum Mechanics. General Relativity (GR) tells us how the presence of mass curves and warps spacetime, changing trajectories of massive objects like planets and altering the experience of time itself.

00:00 GR theory has given us the best descriptions of large scale motion, but as we shrink down to scales below the size of a quark we start to see problems emerge. Some of them come from infinite energies that emerge at infinitesimal short ranges, or in how General relativity changes the results of Quantum Mechanics with the bending of spacetime.

03:00 There are problems with GR, especially how it does not play well with quantum mechanics . Here I discuss the groundwork of topics like background independence and time dilation.Then I Introduce Loop Quantum Gravity (LQG) a possible path to solve the problems. I discuss quantized space and time, the history of how LQG was formulated from Ashketar to Rovelli to the modern day.

07:00 I close with a frank discussion of some problems with LQG, including results from the Fermi Gamma-ray Space Telescope and why some people, like past guest Michio Kaku are skeptical of it because it does not include fermions and is in conflict with Fermi's observations that some believe rules out energy-dependent speeds of light predicted by LQG.

References:
Carlo Rovelli, Loop Quantum Gravity History: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5567241/

Lee Smolin, An Invitation to Loop Quantum Gravity: https://arxiv.org/abs/hep-th/0408048

Jorge Alfaro, Loop Quantum Gravity and Light Propagation https://arxiv.org/pdf/hep-th/0108061.pdf

Fermi Gamma-ray Space Telescope: https://fermi.gsfc.nasa.gov/

More on Spin Networks: https://www.einstein-online.info/en/spotlight/spin_networks/

Bousso vs. Rovelli: https://www.youtube.com/watch?v=jEr038WOKFI&feature=youtu.be

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Видео A New Contender Is Here! канала Dr Brian Keating