Cosmological Constant - Sixty Symbols

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What is the cosmological constant? Ed Copeland and Mike Merrifield.

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I would happily listen Ed Copeland breaking the news of the imminent end of the world with his soothing voice and still feel safe and cosy.

sailawayteam
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5:05 I wish he'd say 'cubic centimeter, or sugar cube's worth of space' rather than "centimeter cubed" which probably doesn't mean much to most people. Gosh I love these videos the most of anything on youtube. I wish you'd do lots more of them. One every hour would be about right.

ananiasacts
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"Science is about aesthetic." (5:50)
A memorable quote.

yusukeshinyama
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@chrislongden4 The cosmological constant is denoted by the capital lambda (Λ), while the decay constant is denoted by the lowercase lambda (λ), which is used in the Half-life games.

Anonymous
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Great video.
It would've been really nice to see an image of Einstein's equation with the lambda in it.

AlanKey
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@hikergate thank you... get our fair share of positive and negative comments, but always enjoy the positive ones more! ;)

sixtysymbols
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I love it when they show the pictures of stars :D and you can sometimes see a spectrum, it's really beautiful :)

TheLordZixx
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@chrislongden4 the difference is upper vs lower case.
In physics, lower case lambda can also be used for wave-lenght. It's also used in a lot of other fields, usualy refering to rates or distances.

gulllars
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What if the constant is like other forces in that it drops off exponentially? On the quantum scale it could be huge as the mechanics suggest, but on the cosmic scale it is small. That makes sense because when our universe is small it expanded the fastest then.

theatheistpaladin
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that professors voice is so soft its great for asmr. get him to make more vids

redglazedeyez
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Can you tell me where to find the picture used at 2:05 and 6:40?
Those diffraction "pillars" look rather nice.

JuanLeTwnz
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If space itself is expanding then is the plank length getting larger? Is time speeding up or slowing down? and is the speed of light speeding up or slowing down?

JamesCarmichael
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Ok, but could the cosmological constant that quantum theory expects, actually be present and explained by Dark Energy?

TheBaconWizard
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another cracking episode!! iwant to be in a room with all the scientists for like a week it would be awesome!

OysterBarron
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is the constant a very small amount of energy that just blankets the universe in all locations? Like Photons or something?

jgordon
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@chrislongden4 I think thats the lower case lambda (also used to represent wavelength in optics), this video is talking about uppercase lambda. Right?

borderm
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That is why Einstein came up with the cosmological constant, a hypothetical force to act as a repulsive constant in order to prevent the collapsing. The expanding models are not predicted by general relativity at all, they were proposed as ad hoc solutions by Alexander Friedmann. Look it up

SuperFinGuy
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I think these videos are excellent! If these are all professors at the uni of Nottingham, it makes me want to go back to school. ;)

twstdelf
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@2szymi Not just you. Something strange going on there. The sound is odd too... I can't find a comfortable volume.

McPrfctday
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@jgordon707, you don't come off as rude at all. I liken the cosmological constant to the interest rate on savings because they both only make sense as positive inflation rates and have many interesting shared corollaries. Both are measures of something somewhat intangible (the expansion of wealth is similar to the expansion of space--everywhere and uniform locally but not necessarily globally, etc.) And as I was trying to point out, both seem to have mysterious somewhat paradoxical properties.

ananiasacts