
20221116: Are there Undiscovered Elements Beyond The Periodic Table?
 17:30: Nick Bostrum’s selfsampling assumption tries to clear this up.


20221109: What If Humanity Is Among The First Spacefaring Civilizations?
 06:17: The authors’ best guess is between 4 and 8, admittedly with some major assumptions.
 13:55: At least, given the assumptions of this model.
 14:45: Remember, this is a model, and it’s conclusions are only as good as the assumptions behind the model.


20220615: Can Wormholes Solve The Black Hole Information Paradox?
 06:01: ... theory is right, and forget about the fact that some of the assumptions of AdS/CFT definitely do NOT apply to our ...
 06:54: ... of the AdS/CFT solution, but they don’t depend on its significant assumptions of ...


20220504: Space DOES NOT Expand Everywhere
 03:27: ... FLRW metric makes some pretty big assumptions  that the matter in the universe is perfectly evenly spread out  ...
 04:54: ... latitude and longitude. Those lines are smooth because of our founding assumptions of homogeneity and isotropy. But if we zoom in we can see that the shape ...


20220330: Could The Universe Be Inside A Black Hole?
 09:06: ... assumption of homogeneity and zero pressure was the same that Alexander Friedmann ...


20220323: Where Is The Center of The Universe?
 02:41: ... today I want to dig deeper and see what assumptions are behind this interpretation, and also ask what it would mean if those ...


20220112: How To Simulate The Universe With DFT
 15:07: The assumption in this calculation is that the black hole came from interstellar space and fell into the solar system.


20211117: Are Black Holes Actually Fuzzballs?
 05:06: But that assumption may be wrong.


20211102: Is ACTION The Most Fundamental Property in Physics?
 17:54: ... also puts it well: If we assume the universe operates under certain assumptions (infinite/finite, discrete/continuous spacetime, invariance, quantum ...


20210525: What If (Tiny) Black Holes Are Everywhere?
 04:10: But these are still hacks  approximations that involve different assumptions, or only work in certain ideal circumstances.
 04:19: One big assumption is that the space near the event horizon isn’t TOO strongly curved compared to the smallest quantum scale.
 04:26: ... Hawking made that assumption, it enabled him to mathematically connect the highgravity region near ...


20210323: Zeno's Paradox & The Quantum Zeno Effect
 14:22: ... either the CMB or supernova measurements, but also by finding one of the assumptions in the CMB calculation is wrong  which would force us to change our ...


20210309: How Does Gravity Affect Light?
 01:04: Michell and Cavendish used the same utterly wrong assumptions to do their calculations.
 01:26: But the weird thing is that despite these incorrect assumptions, the effects that these guys predicted have proved very real.
 04:47: ... and have it fall back, as calculated by Michell from totally wrong assumptions. ...
 09:17: ... just need two completely crazy assumptions  first that light acts like a very classical, 17thcentury style plane ...


20210119: Can We Break the Universe?
 00:17: ... theory started with the simple assumption that the speed of light was the fastest speed possible, and that all ...


20201027: How The Penrose Singularity Theorem Predicts The End of Space Time
 04:35: ... Penrose showed that according to Einstein’s theory plus a couple of assumptions, black holes must contain singularities. And this is true regardless ...


20201013: Do the Past and Future Exist?
 01:54: Newton’s picture of the universe included one other assumption that we know for sure is wrong.


20200908: The Truth About Beauty in Physics
 08:04: But then a simple modification to the founding assumptions caused this mess to collapse into a supremely elegant form.
 08:28: Oh, by the way, the modified assumption that led to Dirac’s miraculous algebraic convergence?


20200901: How Do We Know What Stars Are Made Of?
 08:24: ... get the total quantity of each ion or of the element, with certain assumptions she could get the relative amounts of the elements compared to each ...


20200728: What is a Theory of Everything: Livestream
 00:00: ... when you do that and you try to keep quantum mechanics consistent the assumptions you made about quantum mechanics pops out of the equations out of ...


20200527: Does Gravity Require Extra Dimensions?
 15:10: The quality of the predictions of any model depend on the assumptions that go into it.
 15:16: And in the case of the black holes, several unreasonable assumptions allow us to trace geodesics into alternate universes.
 15:24: ... universe through the nonrotating Schwarzschild black hole requires the assumption that the black hole has been there ...
 15:33: ... string of universes through the rotating Kerr black hole requires the assumption that the impossibly unstable inner structure of the Kerr spacetime ...


20200303: Does Quantum Immortality Save Schrödinger's Cat?
 09:08: Depending on some assumptions like the average lifespan you get that something like 1718 trillion people will have lived by the year 3000.


20200203: Are there Infinite Versions of You?
 04:25: That is, IF our assumptions are right.
 10:21: We covered most of the important assumptions in this crazy hypothesis  except the main one.


20200127: Hacking the Nature of Reality
 07:12: ... and momentum, the behavior of quantum properties like spin, and the assumption of a family of particles that can be involved in the ...


20200113: How To Capture Black Holes
 11:18: ... — assuming accretion disk mergers are really happening, and that all the assumptions of the model hold ...


20191217: Do Black Holes Create New Universes?
 16:08: ... 3: Assume selfsampling assumption makes sense and internet access is bell curved over over the duration of ...


20191209: The Doomsday Argument
 02:49: ... the assumption that lower cosmological constants were less likely than higher ones, ...
 03:31: ... that most astronomers across the multiverse would observe, with a few assumptions like that the number of astronomers in a universe is proportional to the ...
 04:15: ... rather than environments is essentially using the SelfSampling Assumption, defined by philosopher Nick Bostrom as follows: “All other things equal, ...
 06:46: Let’s apply the selfsampling assumption and imagine that you could have been any one of the past and future humans of our species.
 08:17: ... principle is interpreted, in particular through the selfsampling assumption and the definition of your reference ...
 08:54: In the doomsday argument, the assumption is that our “reference class” is all past and future humans.


20191202: Is The Universe Finite?
 09:12: It’s the statistical confidence in the model fit given the assumptions that went into the model.
 09:19: ... other words, IF all of those assumptions are correct then there’s less than 1% chance that a flat universe would ...
 09:36: Two is that the assumptions that went into the model are wrong.


20191118: Can You Observe a Typical Universe?
 09:08: ... the assumption that our universe resulted from a simple random fluctuation in an ...
 10:08: ... it he defines, although doesn’t invent, the selfsampling assumption, which states that “All other things equal, an observer should reason as ...
 10:41: The anthropic principle and the selfsampling assumption encourage Bayesian thinking.
 11:25: ... we covered, to the doomsday argument  the idea that the selfsampling assumption predicts that the end of the world is nigh  which we’ll cover soon  ...
 16:43: ... selfsampling assumption says we should assume we're a typical observer  so maybe the most ...


20191015: Loop Quantum Gravity Explained
 11:13: And without adding big assumptions – like the existence of strings or extra dimensions or supersymmetry.


20191007: Black Hole Harmonics
 05:27: Matthew Giesler, Max Isi, Mark Scheel and Saul Teukolsky of CalTech and MIT went against this these prior assumptions in their recent paper.


20190410: The Holographic Universe Explained
 10:23: ... certain assumptions he found that the resulting braney structure looked just like a ...


20190130: Perpetual Motion From Negative Mass?
 10:10: With this sort of highly speculative science, you really have to dig down and look at the assumptions in ALL of the theory.
 10:54: Well it turns out that there were hidden assumptions even in that effort.
 11:22: Either way, the structure of geodesics have inbuilt the assumption of the equivalence of gravitational and inertial mass.


20190124: The Crisis in Cosmology
 00:21: ...some of the most basic assumptions about the universe.
 03:42: But this calculation involves assumptions and uncertainties.


20190109: Are Dark Matter And Dark Energy The Same?
 06:59: To make the same negative mass stuff also emulate dark energy requires an extra gigantic assumption.


20181212: Quantum Physics in a Mirror Universe
 00:02: ... at least somewhat targeted to star systems or even planets depending on assumptions evolving a technological civilization to the point that they can ...


20181018: What are the Strings in String Theory?
 14:50: This is one of the assumptions we made in the calculation.


20181010: Computing a Universe Simulation
 10:43: ... so wildly different results depending on your assumptions by the way, getting your results of the simulation will take forever, ...


20180912: How Much Information is in the Universe?
 10:26: You're going to need to make a bunch of assumptions, and there isn't a single perfect answer.


20180725: Reversing Entropy with Maxwell's Demon
 11:43: Iago Silva criticizes our assumption of the ergodic hypothesis.
 11:49: ... the nonphysicists out there, the ergodic hypothesis is basically the assumption that all microstates are equally probable over long periods of ...
 12:01: Starting with this assumption gets you to the Boltzmann equation, and it's a nice, relatively simple way to understand entropy.


20180523: Why Quantum Information is Never Destroyed
 06:49: And this unitarity is a foundational assumption in all formulations of quantum mechanics and quantum field theories.


20180516: Noether's Theorem and The Symmetries of Reality
 06:56: It's a founding assumption behind these derivations, and it's also the founding assumption behind Noether's theorem.
 07:02: However, as a founding assumption, that is as close to as fundamental as we can get.


20180228: The Trebuchet Challenge
 05:19: I should add that we're making a few assumptions here.
 05:35: These assumptions aren't entirely reasonable.


20170824: First Detection of Life
 00:58: ... life on a world using only data taken from space, and with as few prior assumptions as ...


20170503: Are We Living in an Ancestor Simulation? ft. Neil deGrasse Tyson
 03:23: That under certain assumptions, virtual minds should vastly outnumber real minds in our universe.
 05:52: But whatever, let's go with Bostrom's assumption.


20170426: Are You a Boltzmann Brain?
 09:25: ... caution in arguing probabilities before really understanding the prior assumptions. ...


20170111: The EM Drive: Fact or Fantasy?
 08:29: ... none of this is relevant unless the founding assumption is right, that the vacuum is something very different than described by ...


20161102: Quantum Vortices and Superconductivity + Drake Equation Challenge Answers
 05:11: ... in the pessimistic assumption that we are the only technological civilization in the neighborhood, and ...
 06:47: ... nearest Type II, Dyson Swarmcapable civilization should be, under the assumption that the weird dimming seen in Tabby's Star is due to a Dyson Swarm and ...


20161005: Are We Alone? Galactic Civilization Challenge
 03:03: ... in the Milky Way, they asked the following In the deeply pessimistic assumption that humanity is the only technological civilization in the entire known ...


20160921: Quantum Entanglement and the Great BohrEinstein Debate
 01:04: ... existing when we're not looking at it is a pretty fundamental implied assumption behind all of classical ...
 02:40: ... proposed a quantum scenario that showed that in order to abandon the assumption of realism, you also had to abandon a concept almost as sacred ...


20160706: Juno to Reveal Jupiter's Violent Past
 11:41: ... I said that the assumption of infinite divisibility of space was a problem with the scenario in ...


20160323: How Cosmic Inflation Flattened the Universe
 04:33: We need to throw out that assumption because it is giving us the wrong answer.
 04:37: That's a science thing, questioning your assumptions.


20151007: The Speed of Light is NOT About Light
 02:38: In fact, we now know that even Newton's mechanics were using assumptions that implied an infinite speed of light, which is really bad.


20150805: What Physics Teachers Get Wrong About Tides!
 01:50: So right up front, I want to make some assumptions to simplify the analysis and to remove unimportant factors from the picture.
 02:01: Assumption one we're going to use Newtonian gravity.
 02:10: Assumption two let's ignore the Sun.
 02:18: Assumption three we're going to pretend the Earth is uniformly covered with one humongous ocean and no continents.
 02:24: And finally, assumption four we're going to pretend that we can switch Earth's gravity on and off whenever we want to.


20150729: General Relativity & Curved Spacetime Explained!
 05:49: ... making any assumptions about how gravity effects light, that would be true even if it turned ...


20150624: The Calendar, Australia & White Christmas
 06:27: And the operating assumption of SETI for several decades is that maybe aliens are broadcasting such a beacon into space.


20150422: Are Space and Time An Illusion?
 07:20: First of all, that assumption is unnecessary.


20150218: Is It Irrational to Believe in Aliens?
 03:48: That a species would spread out isn't some crazy assumption on our part.
