Why the Universe Needs Dark Energy | Space Time | PBS Digital Studios
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Part 2 in our Dark Energy series. Part 1: https://www.youtube.com/watch?v=xZTb6sfHEX8 Check out our sister channel Crash Course Physics to learn more about the basic foudations of Physics: https://www.youtube.com/watch?v=ZM8ECpBuQYE&list=PL8dPuuaLjXtN0ge7yDk_UA0ldZJdhwkoV Get your own Space Time t-shirt at http://bit.ly/1QlzoBi Tweet at us! @pbsspacetime Facebook: facebook.com/pbsspacetime Email us! pbsspacetime [at] gmail [dot] com Comment on Reddit: http://www.reddit.com/r/pbsspacetime Support us on Patreon! http://www.patreon.com/pbsspacetime Help translate our videos! http://www.youtube.com/timedtext_cs_panel?tab=2&c=UC7_gcs09iThXybpVgjHZ_7g Now that we know the universe will continue to expand forever, we can begin to complete the first Friedmann equation, and determine the shape and geometry of our universe. At first glance, it would seem that the equation doesn’t quite add up, and that our universe is a hyperbolic plane. But when we add in the cosmological constant, the equation balances out, and we return to a flat universe. _____________________ COMMENTS: Deiter Meena https://www.youtube.com/watch?v=xZTb6sfHEX8&lc=z13uzj2y2uf2xl3ck23zwfuxkqyzidsfh Jack W https://www.youtube.com/watch?v=xZTb6sfHEX8&lc=z13rih2gupnudr3x004cjbw4pyryezmi0ig Mychelly Goulart https://www.youtube.com/watch?v=xZTb6sfHEX8&lc=z13mzpkq3qauip1xw04cjvoxxsj1fhv5uac Tomek Wooff https://www.youtube.com/watch?v=xZTb6sfHEX8&lc=z12hxbtrbvezin5ra04cd3cyrou3fxk55o00k Mr B https://www.youtube.com/watch?v=xZTb6sfHEX8&lc=z13qfhkoclzqf11dx235d3zj0zucyjsxj04 ______________________ Written and hosted by Matt O’Dowd Made by Kornhaber Brown (www.kornhaberbrown.com)
Comments
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epic ending ! :)
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Probably k is half -1, half +1, thus 0. http://1.bp.blogspot.com/-2xg3ZQnikJQ/UwSUOcKfJ-I/AAAAAAAAIgc/TDJpnQ2a920/s1600/Yin-Yang-symbol.jpg
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We look so much outside instead of realizing our natural state of being, that of enlightenment. I do know little about physics and astrology but i sure do know that we are eternal light beings which most of us are trapped in the mind which brings suffering.
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Can someone clear this up for me? I think of the space within the observable universe as basically a giant 3D object with stuff in it, that is expanding at all its edges. So what the heck is meant when it is said that the universe is flat? I can't wrap my head around this.
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Matt: "We don't stoop to blooper humour"
Crash Course: Gets triggered -
Hi. Thanks so much for describing the Friedmann Equation. I mentioned this video in a post to Physics Forums just now: https://www.physicsforums.com/threads/modeling-some-sn1a-data-in-minkowski-spacetime.894952/
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nice miskatonic university shirt!
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so terrifying
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What about universe that is a fractal that increases in complexity according to the interaction of beings in it? Dark energy would be plus or minus zero according to if that complexity increases density or momentum.
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lold at "that was my acting"
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Shoutout to HP Lovecraft lol
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there is no such thing like dark energy
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"We now live in a Universe governed by dark energy." My relation to the US election...
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I think I'm not understanding. Will it continue to expand after heat death?
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i have interesting theory so if space extending but it not extending inside of galaxies coz of strong gravity, so in theory space extending only outside of galaxies and what if we reach to edge of our galaxy and step one more step outside of it, than we are in theritory of space that extending and we will start to extend too, space of that one step will start to extending and soon we will be (hypothetically) 3 5 10 20 steps away from galaxy pls comment on reply to talk about my theory
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@4:40: isn't (a/a)^2 always 1?
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you should have way more subscribers, great channel
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In my view the existence of dark energy only reinforces the idea that the current state of the universe is a false vacuum and that vacuum decay is a real possibility.
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Ad hoc mathemagics, in order to hold together a theory, where 96% of the matter and energy is non falsifiable through the scientific method. That's call faith brotha not physics.
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In the 2:00 min you(Matt) say that left side(sum of expanding and density terms) of freedman equations must to be positive, but why? It's experimental results/evidences? If yes, what?
Thanks
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