Our Ignorance About Gravity
2,051,012
Published 2019-06-20
This video is about how little we know about the behavior of gravity at short length and distance scales, what the constraints are on the inverse square law/Newton's law of universal gravitation, at the human and microscopic and atomic scales. Only on solar system scales or larger do we have good constraints on Newton's law of gravitation.
REFERENCES
Review of short-range gravity experiments in the LHC era
arxiv.org/abs/1408.3588v2
Zeptonewton force sensing with nanospheres in an optical lattice
arxiv.org/abs/1603.02122
Large extra dimensions
en.wikipedia.org/wiki/Large_extra_dimension
Search for Screened Interactions Associated with Dark Energy Below the 100 μm Length Scale
arxiv.org/abs/1604.04908
Tests of the Gravitational Inverse-Square Law below the Dark-Energy Length Scale
arxiv.org/abs/hep-ph/0611184v1
Photon Mass Experiment
dx.doi.org/10.1119/1.13149
Torsion balance experiments: A low-energy frontier of particle physics
E.G. Adelberger, J.H. Gundlach, B.R. Heckel, S. Hoedl, S. Schlamminger
doi:10.1016/j.ppnp.2008.08.002
TESTS OF THE GRAVITATIONAL INVERSE-SQUARE LAW
E.G. Adelberger, B.R. Heckel, and A.E. Nelson
Annu. Rev. Nucl. Part. Sci. 2003. 53:77–121 doi: 10.1146/annurev.nucl.53.041002.110503
Physical Review A, Vol 33, No 1: Improved result for the accuracy of Coulomb's law: A review of the Williams, Faller, and Hill experiment.
Lewis P. Fulcher.
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All Comments (21)
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"The Earth looks flat when..." flat-earther: say no more
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Well this wouldn't be a problem if Isaac Newton didn't invent gravity
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I wish we could just float around like we did before newton discovered gravity
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5:00 be careful with that exclamation mark when dealing with a math problem
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still it seems to an excellent estimation by considering 1600's world
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Now IF ONLY some Hipster could have plucked the Bass while I was learning Physics back in High School... XD
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Minute Physics: "Hair is actually 2D" Uh excuse you, my hair has VOLUME.
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I've done many observations, and two sheep definitely attract.
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According to Keeanu Reeves Gravity is the secret for staying down-to-Earth
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you could say we don't really understand the gravity of the situation
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In other words: Newtons law isnt wrong. Its imperfect, specialized, or misses factors that are ignorable in some cases but important in other cases. But thats physics.
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Scientist: How many dimension we need to discover you? Gravity: Yes.
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ZeptoNewtons. So small you never even heard of it
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Me: *spends years and patience to understand physic laws MinutePhysics: ding dong what you knew is wrong
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The best part about these videos is that the step-by-step reasoning is always clear and eminently logical, even if how the math works may be hard to grasp for non-specialists and even if the proposed conclusions seem unimaginable. Like following a trusted friend through a jungle on an island, listening to him explain why we're taking a particular route, which all seems very logical until we come to a clearing and somehow we're in the Alps.
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Who knew you could make an epic depiction of a black hole with just a sharpie and some pencil crayon scribbles?
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@minutephysics Henry, the graph at 3:25 is wonderful. This aspect of science is so poorly understood and I think leads to a large amount of pseudoscience. Could you please make a video with several different concepts showing how certain we are about each concept. This shows the danger of extrapolation so clearly! Excellent video as usual. Thanks, Ben - a mathematician.
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I'm reminded of what Klaatu told Professor Barnhart in The Day the Earth Stood Still. "It (Newtonian gravitation) works well enough to get me from one planet to another."
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4:15 I heard this dialogue in the movie INTERSTELLAR
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Me: Watching video, pretending to understand everything
