Two Simple Reasons Why We Can't Solve Quantum Gravity? @ArvinAsh

Uploaded August 2024 | Updated September 2026, 2 weeks ago

Full video here; youtu.be/SztyY_NVXMc This video discusses two simple reasons why we can't figure out quantum gravity. Namely incompatibility of their mathematics and the fact that gravitational effects are very weak.

Two Simple Reasons Why We Cant Solve Quantum Gravity?

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$Why Physics Says You Have Infinite Copies If you’re struggling, consider therapy with our sponsor. Click https://betterhelp.com/arvinash for a discount on your first month of therapy. If you have questions about the brand relating to how the therapists are licensed, their privacy policy, or therapist compensation, here is an overview written by the YouTube creators behind the channel Cinema Therapy that goes into these topics: https://www.reddit.com/r/cinema_therapy/comments/1dpriql/addressing_the_betterhelp_concerns_headon_deep Talk to ME (ARVIN) on Patreon: https://www.patreon.com/arvinash REFERENCES videos Sean Carroll Interview: https://youtu.be/zStPYpZk2PY Many world interpretation of QM: https://youtu.be/5cYwvzmZLx8 Eternal Inflation theory: https://youtu.be/nziePav5OMg Cosmic Inflation theory: https://youtu.be/q5dy-NtVeF0 CHAPTERS 0:00 Where the idea of copies of you comes from 1:25 Brane multiverse and Cyclic multiverse concepts 3:10 Briefly explaining how quantum mechanics works 5:00 BetterHelp & why I started this channel 6:55 The quantum multiverse explained 10:25 The Inflationary multiverse explained 15:03 Can we ever communicate with our multiverse selves? 15:27 Alan Guth says we must take this seriously SUMMARY The idea that there may be different versions of you comes from the concept of multiverses. There are many types of multiverses in physics. But at least two multiverse concepts based on generally accepted and observationally confirmed scientific theories. 4 popular multiverse concepts: 1) Brane Multiverse, based on String Theory, the math of which says that our four dimensional universe exists on a membrane or brane floating in a higher dimensional space. 2) Cyclic Multiverse which proposes that our universe goes through cycles of expansion and contraction. Given an infinite number of cycles, duplicate universes as ours are bound to exist. These two multiverse ideas do not appear to be supported by observational evidence. 3) Quantum multiverse. It comes from the Many-Worlds Interpretation of quantum physics. Everytime a quantum system in superposition is observed, the world splits into one that we observe, and others that we dont observe. According to the Many Worlds Interpretation, the wave collapse never occurs. but only appears to collapse in our universe, which is just one branch of a myriad of possible parallel universes where the wave continues unabated. This interpretation of quantum mechanics preferred by 20-30% of physicists. If true, it would mean that there would indeed be many different versions of you in these branching universes with slightly different results from quantum interactions. And over the long haul, the different interactions could result in completely different circumstances for your life. 4) Eternal cosmic inflation, which comes from the Lambda CDM model of the universe, or more informally, the Big Bang theory. It says that in the very early period of the Big Bang, for a fraction of a second, the universe expanded extremely rapidly, at an exponential rate. Even though it lasted for a fraction of a second, the universe expanded by a factor of about 10^30x. This is cosmic inflation. Space itself expanded, or inflated rapidly. This explains why the universe is isotropic, meaning it looks nearly the same in all directions, why the cosmic microwave background which is the leftover radiation from the Big Bang, is distributed so evenly. The idea is that the rapid inflation would have diluted large differences to make the universe more homogeneous. And Inflation explains the origin of the large-scale structure of the universe. Quantum fluctuations in the microscopic regions where inflation was taking place, magnified to cosmic size became the seeds for the large scale structures of galaxies and clusters of galaxies we see today. #quantumphysics #multiverse But other non-observable predictions also arise as consequences of inflation. One is that during the early universes rapid inflation period, different regions of space could have inflated at different rates. Since quantum mechanics ensures that there will always be some randomness. Inflation could last a bit longer or shorter in different parts of the universe. Scientists realized that although inflation stopped in our part of the universe, it could have continued without end in other unobservable parts of the universe. Those unobservable parts that continued to expand would have formed other universes. And if this happened an infinite number of times, then there are bound to be copies of you in all different and even duplicate circumstance there. Physicist Alan Guth, who is the founding father of inflation theory said that, most models of inflation do lead to a multiverse...$

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$10 Biggest Cosmic Mysteries Scientists Have NO CLUE about...STILL! 👉 To learn for free on Brilliant, go to https://brilliant.org/arvinash . Get a 20% discount on the annual premium subscription if you subscribe! Your subscription will help us create more videos like this! Thank you so much! TALK TO ARVIN & Get EARLY ACCESS https://www.patreon.com/arvinash REFERENCE VIDEOS How did a universe come from nothing? https://youtu.be/A_H0BT9ft_M Why do the laws of physics exist? https://youtu.be/JgYEegLu2-s Black hole information paradox https://youtu.be/GfCc2h_85kM What happened to antimatter? https://youtu.be/h9d_HimHmG0 Quantum gravity problem https://youtu.be/NsUm9mNXrX4 Are we alone? https://youtu.be/jH0_C1kUOEw Entropy and time https://youtu.be/pvPxCtrXT1c Multiverses exist? https://youtu.be/DpFlqcMwh2U CHAPTERS 0:00 Biggest cosmic mysteries 1:10 Biggest puzzle in fundamental physics 2:34 An invisible world 5X larger than what we see 5:29 Accelerating expansion, the 68% mystery 7:15 Why didnt everything annihilate? 8:36 Cosmic inflation: What? Why? How? 9:20 Information lost forever? 10:30 Cracks in the Standard Model 11:18 The enigma of the arrow! 11:58 Whos asking? 12:58 Maybe theres much, much more? 14:00 Are you the next Einstein? (please email me if so) SUMMARY Humanity has achieved astonishing feats—landing on the Moon, splitting the atom, photographing black holes—yet 95% of the universe remains invisible and unexplained. Our best theories, general relativity and quantum mechanics, describe large and small scales separately but fail when combined. They collapse into infinities near black holes or the Big Bang. A unified “quantum theory of gravity,” or Theory of Everything, remains the biggest goal in physics. Ideas like string theory and loop quantum gravity try to merge them, while observatories such as LIGO and the Event Horizon Telescope search for cracks in Einstein’s equations that could guide the way. Even what we can see is only a fraction of reality. Ordinary matter accounts for just 5% of the cosmos. About 27% is dark matter—an invisible substance inferred from its gravitational effects on galaxies. It doesn’t emit or absorb light, yet shapes the universe’s structure. Physicists suspect exotic particles like WIMPs, but despite decades of searches using underground detectors and sky surveys such as Euclid and Vera Rubin, no direct evidence has appeared. Stranger still, the universe’s expansion is accelerating. To explain this, scientists propose “dark energy,” an unseen force making up about 68% of the cosmos. It may be Einstein’s cosmological constant—energy built into space itself—or a dynamic field known as quintessence. Its nature is unknown, but it determines the ultimate fate of the universe. Projects like DESI and Euclid map galaxies to see whether dark energy is constant or changing over time. Another mystery is why anything exists at all. The Big Bang should have created equal amounts of matter and antimatter, which destroy each other when they meet. Yet matter somehow won, producing the universe we see. This imbalance, called matter–antimatter asymmetry, may stem from tiny symmetry violations in particle interactions. Experiments at CERN’s LHCb and the DUNE neutrino project search for clues to how matter gained its advantage. Cosmic inflation, a burst of rapid expansion moments after the Big Bang, explains why the universe looks uniform. But scientists still don’t know what caused it or why it stopped. Telescopes like BICEP and Keck study faint polarization patterns in the cosmic microwave background for evidence. Black holes present the information paradox: relativity says all data inside them is destroyed, but quantum mechanics forbids that. Experiments from the Event Horizon Telescope to lab-created “toy black holes” test whether information can escape through Hawking radiation. Even the Standard Model of physics, though successful, leaves out gravity, dark matter, and neutrino masses. New experiments probe possible anomalies or even a fifth fundamental force. Time itself is a puzzle. The laws of physics work forward and backward equally, yet reality flows one way. Entropy, or increasing disorder, may define this arrow of time, but whether it causes or results from time’s direction remains unknown. Finally, we ask: are we alone? With trillions of galaxies and billions of habitable planets, life should be common. Yet none has been found—the Fermi Paradox. The James Webb Telescope and missions to Europa and Enceladus hunt for chemical signs of life, while SETI listens for artificial signals. #sciencemysteries Each unanswered question—dark matter, dark energy, quantum gravity—marks both a gap in knowledge and an opportunity. Every great mystery cracked before has revolutionized civilization. The universe is still unfinished business, waiting for the next mind to uncover its secrets.$

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