Anti-gravity and the True Nature of Dark Energy | Space Time | PBS Digital Studios



What about dark energy allows it to resist the powerful inward pull of gravity and accelerate the rate of the universe’s expansion? Find out in this episode of Space Time. And watch our previous episodes on dark energy right here:
Part 1 – Will the Universe Expand Forever https://www.youtube.com/watch?v=xZTb6…
Part 2 – Why the Universe Needs Dark Energy https://www.youtube.com/watch?v=-4Pay…
Part 3 – What Does Dark Energy Really Do? https://www.youtube.com/watch?v=RUE_L…

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We’ve come a long way in our understanding of dark energy. In previous episodes we’ve looked at how our universe is paradoxically flat and how dark energy is exponentially accelerating the expansion of the universe. In this episode of Space Time we dive into the true nature of dark energy and how its antigravity effect and its other properties are having such bizarre effects on our universe.

Written and hosted by Matt O’Dowd

Made by Kornhaber Brown (www.kornhaberbrown.com)

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38 thoughts on “Anti-gravity and the True Nature of Dark Energy | Space Time | PBS Digital Studios

  • November 21, 2017 at 5:23 pm
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    I like when you put equations in your videos, it makes them much easier to understand

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  • November 21, 2017 at 5:23 pm
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    if dark energy is just the property of space then what about the space that is there between atoms ,we know it's there in large amount it means every atom on earth must have drifted away from each other and that too exponentially .

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  • November 21, 2017 at 5:23 pm
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    Please forgive my ignorance on the subject, but could dark energy/matter be related to the same physics as the Accuberrie "warp drive"? In other words, could pockets of dark energy act in a manner similar to a warp field?

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  • November 21, 2017 at 5:23 pm
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    a few videos in the future and you say "wait is the universe expansion accelerating at all?"

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  • November 21, 2017 at 5:23 pm
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    If Dark Energy drives the expansion of spacetime, shouldn't it have a negative energy density, like exotic matter/Casimir effect?

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  • November 21, 2017 at 5:23 pm
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    Do black holes play any part in inflation? Do black holes have any causal link to negative pressure?

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  • November 21, 2017 at 5:23 pm
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    use quantum entanglement to communicate with it,, you know we could, on, off. or 0 and 1 spin one way,, spin tuther,,, communication faster than light

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  • November 21, 2017 at 5:23 pm
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    Would we see the observable universe as flat because the negatively curved hyperbolic hyperplane are so much larger than what we can observe, so that we se the “universe” as flat?

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  • November 21, 2017 at 5:23 pm
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    Never more pshisics this no good do gravity spin is no finish is start my way to stars this ia naturale perpetuum wakeupp

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  • November 21, 2017 at 5:23 pm
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    I'll need two more years of intensive study to understand half the things being explained in this video.

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  • November 21, 2017 at 5:23 pm
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    8:12 zero quadruple factorial? So the pressure is actually less than 1!

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  • November 21, 2017 at 5:23 pm
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    If dark energy has negative pressure and produces Anti gravitational effect, then it could be used for the back part of the Alcubierre warp drive bubble?

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  • November 21, 2017 at 5:23 pm
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    So… I am smoking a cigarette while watching this, and a thing pops into my mind as smoke drifts into my view- what if all of our universe is not a closed system of sorts, a bubble if that suits you, but a object floating within something else invisible to our perception of reality. Just like smoke being blown out of the mouth,our universe was constrained in a small volume but it started to expand, and just as smoke molecules drift away from each other and air gets between them and speeds their expansion so do the galaxies drift apart and dark energy gets in between and pushes them apart. I know you can't really use such mundane examples to explain difficult concepts as quantum effects but this is how i visualise space. One might say that, if the space is like smoke in the wind, how come we don't see this medium in which space floats? Imagine if our galaxy was the size of a single smoke molecule and you were on earth, what would you see? The photons that reflect out of the outside would be huge, and because of that we would perceive the "outside" of our universe as a huge void, simply because our measure instruments would be so tiny compared to the particles of the medium we would try to observe.

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  • November 21, 2017 at 5:23 pm
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    Could origin and nature of the cosmological/dark energy emerge from the equations of supergravity, or perhaps a theory of quantum gravity that would improve general relativity?

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  • November 21, 2017 at 5:23 pm
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    even if we understand it, what next? what if the optimal time it takes the understand even half of this could be mathematically calculated and turns out to be longer than the lifetime of earth itself. What is the point in trying to understand?

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  • November 21, 2017 at 5:23 pm
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    How does gravity affects the expansion on the universe, doesn't gravity only affects objects w/ mass? So how can affect and halting the expansion of the "void" of the universe? So what is gravity and what is its proprety?

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  • November 21, 2017 at 5:23 pm
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    Do you realize that Einstein just pulled a formula out of his ass because he thought the universe was static, and you used that as your justification for extending the laws of physics? This is Alice-In-Wonderland logic, but if you have a Ph. D. and you say this nonsense with authority often enough, you get get people to say "Oh, yeah. That makes sense."

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  • November 21, 2017 at 5:23 pm
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    Is the increase of expentional expansion fluctuating? If not could a case be made that Dark Energy in itself be described as a cosmic constant towards the expansion is going?

    Did Dark Energy hold back of sorts the expansion at the time of the big bang and is worn down over time so now with less and less standing against it the expansion is pulling outwards more strongly?

    7:44 "helps flatten the geometry of the universe" what like making it a disc shape like a galaxy or what does he mean by this?

    Energy out of nothing and lost for ever 0_0 ok i am really a newtonean pleb it seems, that stuff here really blew my mind.

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  • November 21, 2017 at 5:23 pm
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    Dark energy is not anti gravity, far far from it. This is like calling the weak force 'anti strong force'. Its far beyond over simplification! There is also no evidence that gravity can affect the metric expansion.

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  • November 21, 2017 at 5:23 pm
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    So if we could manipulate dark energy could we use it as a propulsion source like warp drive and then if you can manipulate the energy which is constant through the universe then could you go "faster" than light by crunching up the universe

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  • November 21, 2017 at 5:23 pm
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    I just came back from the bathroom with this video still playing. I thought I was watching Shrek is Love, Shrek is Life from the music. I can't be the only one

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  • November 21, 2017 at 5:23 pm
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    Could dark energy be considered the equivalent to antimatter? If so, why, and if not, why not? Also, since new dark energy is created from the negative outward pressure, would that result in lower entropy?

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  • November 21, 2017 at 5:23 pm
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    how can we proof that law of conservation of energy doesnt works in the mighty universe

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  • November 21, 2017 at 5:23 pm
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    Inspire enough smart kids to become scientists instead of bankers, lol. I went to college for physics and now I'm a banker. I did the exact opposite lol.

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  • November 21, 2017 at 5:23 pm
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    This statement of the break of conservation of energy can drive many minds into craziness. Can't one hypothesize that either the energy is in fact consumed (taken away) from normal matter, or there is an in-flow of energy into the Universe in the form of dark energy?

    Reply

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