The Arrow of Time and How to Reverse It

Learn more about Audible at: https://www.audible.com/spacetime or text spacetime to 500 500!Uploaded 09-05-19PBS Member Stations rely on viewers like you. To support your local station, go to: http://to.pbs.org/DonateSPACEQuantum computing is cool, but you know what would be extra awesome - a quantum internet. In fact if we want the first we’ll need the latter. And the first step to the quantum internet is quantum cryptography.Check out the new Space Time Merch Store!https://pbsspacetime.com/Support Space Time on Patreonhttps://www.patreon.com/pbsspacetimeNeed a Black Hole Refresherhttps://youtu.be/vNaEBbFbvcY#cryptography #quantumcomputing #spacetimeHosted by Matt O'DowdWritten by Graeme Gossel and Matt O'DowdGraphics by Leonardo WilleDirected by Andrew KornhaberProduced By: Kornhaber BrownQuantum theory may seem like an obscure subject of questionable relevance to the average person. But in fact much of our technological world depends on our understanding of the quantum properties of the subatomic universe. And soon, perhaps very soon, we’ll be interacting with the weirdness of quantum mechanics even more directly – with the coming of quantum computing and the quantum internet. Quantum computing is a topic that’s that has been well covered, so we’re going to be talking about the quantum internet. Specifically quantum cryptography and quantum key distribution – the foundations of the prospective quantum internet. We may come back to quantum computer in detail – but for now let me show you why their advent will demand a quantum internet. Special Thanks to our Patreon Supporters!Big Bang Supporters:Anton LifshitsDavid NicklasFabrice EapJuan BenetQuasar Supporters:Mark RosenthalTambe BarsbayVinnie FalcoHypernova Supporters: Antoine BrugierChuck zegarDanton SpiveyDonal BotkinEdmund FokschanerHank SJohn HofmannJordan YoungJoseph SalomonekkmMark HeisingMatthewMatthew O'ConnorGamma Ray Burst Supporters: Adrien MoyneuxAlexander LazerevAlexey EromenkoAndreas NautschAntonio RuizBradley JenkinsBrandon LabonteBuruk AregawiCarlo MogaveroDaniel LyonsDavid BehtalaDustan JonesGeoffrey ShortJames FlowersJames QuinteroJohn FunaiJohn PollockJonahJoseph DillmanJoseph EmisonJosh ThomasKevin WarneKyle HoferMalte UblMark VasileNathan HitchingsNick VirtuePaul RoseRatfeastRyan JonesScott GossettSigurd Ruud FrivikTim StephaniTommy MogensenYurii Konovaliukسلطان الخليفي Learn more about your ad choices. Visit megaphone.fm/adchoices Learn more about your ad choices. Visit megaphone.fm/adchoices

Viewers like you help make PBS (Thank you 😃) . Support your local PBS Member Station here: https://to.pbs.org/DonateSPACEUploaded 18-07-18Entropy and the second law of thermodynamics has been credited with defining the arrow of time.You can further support us on Patreon at https://www.patreon.com/pbsspacetimeGet your own Space Time t­-shirt at http://bit.ly/1QlzoBiTweet at us! @pbsspacetimeFacebook: facebook.com/pbsspacetimeEmail us! pbsspacetime [at] gmail [dot] comComment on Reddit: http://www.reddit.com/r/pbsspacetimeHelp translate our videos!https://www.youtube.com/timedtext_cs_...Previous Episode:Quantum Invariance and The Origin of The Standard Modelhttps://www.youtube.com/watch?v=V5kgruUjVBsEntropy is surely one of the most intriguing and misunderstood concepts in all of physics. The entropy of the universe must always increase – so says the second law of thermodynamics. It’s a law that seems emergent from deeper laws – it’s statistical in nature – and yet may ultimately be more fundamental and unavoidable than any other law of physics. Hosted by Matt O'DowdWritten Matt O'DowdGraphics by Grayson BlackmonAssistant Editing and Sound Design by Mike PetrowMade by Kornhaber Brown (www.kornhaberbrown.com)Special thanks to our Patreon Big Bang, Quasar and Hypernova Supporters: Big BangCoolAsCatsDavid NicklasAnton LifshitsJoey RednerFabrice EapQuasarTambe BarsbayMayank M. MehrotaMars YenturMark RosenthalDean FuquaRoman PinchukColeslawPurdieVinnie FalcoHypernovaDonal BotkinEdmund FokschanerMatthew O’ConnorEugene LawsonBarry HatfieldMartha HuntJoseph SalomoneChuck ZegarCraig PetersonJordan YoungRatfeastJohn HofmannThanks to our Patreon Gamma Ray Burst Supporters: James HughesFabian OlesenKris FernetJane MeyersJames FlowersGreg AllenDenys IvanovNick VirtueAlexey EromenkoNicholas RoseScott GossettMark VasilePatrick Murrayسلطان الخليفيAlex SetoMichal-Peanut KarmiErik SteinKevin WarneJJ BagnellAvi GoldfingerJohn PettitFlorian StinglmayrBenoit Pagé-GuitardNathan LenizBrandon LabonteDavid CraneGreg WeissShannan CatalanoBrandon CookMalte Ubl Learn more about your ad choices. Visit megaphone.fm/adchoices Learn more about your ad choices. Visit megaphone.fm/adchoices

Learn More about The Great Courses Plus: http://ow.ly/wvWC30o0QYVUploaded 20-03-19PBS Member Stations rely on viewers like you. To support your local station, go to: http://to.pbs.org/DonateSPACECheck out the new Space Time Merch Store!https://pbsspacetime.com/Support Space Time on Patreonhttps://www.patreon.com/pbsspacetimeThe power of Dark Energy may be increasing as the universe ages. Subtle clues are emerging that the accepted model for the nature of dark energy and dark matter may not be all that. We saw the first such clue recently in our recent episode on the Crisis in Cosmology. Today we’re doing a Space Time Journal Club to reveal another clue. We’re looking at a new paper in Nature Astronomy, “Cosmological constraints from the Hubble diagram of quasars at high redshifts” by Risaliti and Lusso. It hints that the cosmological constant may not be so constant after all. In fact it may be increasing. If this is true, then our prediction for the future of our universe looks VERY different, and may involve the entire universe tearing itself to shreds at the subatomic level in the Big Rip.On this edition of Space Time Journal Club we look at:Risaliti and Lusso (2019) "Cosmological Constraints from the Hubble Diagram of Quasars at High Redshifts"https://www.nature.com/articles/s41550-018-0657-z#darkenergy #darkmatter #spacetimeMore about The Great Courses Plus: The Great Courses Plus is currently available to watch through a web browser to almost anyone in the world and optimized for the US, UK, and Australian markets. The Great Courses Plus is currently working to both optimize the product globally and accept credit card payments globally.Learn More About Dark Energy Here:https://www.youtube.com/playlist?list=PLsPUh22kYmNA6WUmOsEEi32zi_RdSUF4iHosted by Matt O'DowdWritten by Matt O'DowdGraphics by Aaron HalevyDirecting by Andrew KornhaberSpecial thanks to our Patreon Big Bang, Quasar and Hypernova Supporters: Big Bang:Anton LifshitscoolascatsDavid NicklasFabrice EapJuan BenetJustin LloydTim DavisQuasar:James FlowersMark RosenthalTambe BarsbayVinnie FalcoHypernova: chuck zegarDanton SpiveyDonal BotkinEdmund FokschanerJens TheisenJohn HofmannJordan YoungJoseph SalomonekkmMark HeisingMatthew O'ConnorThanks to our Patreon Gamma Ray Burst Supporters: Alexey EromenkoAntonio RuizBradley JenkinsBrandon LabonteBuruk AregawiCarlo MogaveroDaniel LyonsDavid BehtalaDavid CraneDavid SchmidtDustan JonesGeoffrey ShortGreg WeissJack FroschJames HughesJames QuinteroJinal DoshiJJ BagnellJohn WebberJon FolksJonahJoseph EmisonJosh ThomasKenneth F LeonardKevin WarneKyle HoferMalte UblMark VasileNathan HitchingsNicholas RoseNick VirtueRatfeastRichard BromanScott GossettSigurd Ruud FrivikTim CrookhamTim StephaniTommy Mogensenسلطان الخليفي Learn more about your ad choices. Visit megaphone.fm/adchoices Learn more about your ad choices. Visit megaphone.fm/adchoices

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PBS Member Stations rely on viewers like you. To support your local station, go to: http://to.pbs.org/DonateSPACE↓ More info below ↓Uploaded 15-12-20Sign Up on Patreon to get access to the Space Time Discord! https://www.patreon.com/pbsspacetimeGood news everyone: it looks like the universe is going to end with a series of catastrophic explosions. The very, very long story short is that the universe ends in heat death, as it approaches maximum entropy, and its eternal exponential expansion drives it to effective utter emptiness and absolute cold. But new calculations have revealed we may be able to look forward to one last source of astrophysical cataclysms - a new type of supernova that can only happen at the end of the universe. Check out the Space Time Merch Storehttps://pbsspacetime.com/Sign up for the mailing list to get episode notifications and hear special announcements!https://mailchi.mp/1a6eb8f2717d/spacetimeHosted by Matt O'DowdWritten by Matt O'Dowd Graphics by Leonardo Scholzer, Yago Ballarini, Pedro Osinski, and Adriano Leal Directed by: Andrew KornhaberAssistant Producer: Setare GholipourExecutive Producers: Eric Brown and Andrew KornhaberEnd Credits Music by J.R.S. Schattenberg: https://www.youtube.com/channel/UCRl6-nb4iOnsij-vnpAjp0QSpecial Thanks to Our Patreon SupportersBig BangAhmad JodehAlexander TamasBrodie RaoClinton RobinsonDavid NicklasFabrice EapJuan BenetMark RosenthalMatthew MillerMorgan HoughRadu NegulescuScott GraySean MaddoxQuasarChristina OegrenHank SMark HeisingVinnie FalcoHypernovaAlec S-LBen Delochuck zegarDanton SpiveyDonal BotkinEdmund FokschanerJason FinnJohn HofmannJohn PollockJohn R. SlavikJordan YoungJoseph SalomoneJulian TyackeJustin JermynL. Wayne Ausbrooksm0nkMark Matthew BoskoMathewMatthew O'ConnorNicholas NewlinTimothy McCullochwilliam bryanАнтон КочковGamma Ray BurstA GAdrian HatchAlecZeroAndreas NautschAndrew MannAndrew RichmondAnthony KahngAstaurusAstronauticistBill BlairBleys GoodsonBradley JenkinsBrandon labonteBrandon LattinBrian BlanchardBruce BCameron SampsonCass CostelloChristopher BarronCraig StonahaDan WarrenDaniel JenningsDaniel LyonsDarren DuncanDarryl J LyleDavid HughesDavid JohnstonDawn M FinkDerek DavisDevon RosenthalDFaulkDrJYouEndre PechEric KieblerEric Websterfieldsa eleanoryFrederic SimonGeoffrey ClarionGeoffrey ShortGraydon GossGreg SmithIsaac SuttellIsmael MontecelJ. KingJames RamseyJeremiah JohnsonJeremy ReedJohn FunaiJohn GriffithJohn RobinsonKevin LeeKevin O'ConnellKevin WarneKyle HoferLily kawaiiLuaanLucas MorganMalte UblMark Daniel CohenMartin J LollarMartin SkansMD3Michael BartonMichael ConroyMirik GogriMr TNateNick VirtueNickolas Andrew FreemanOliver FlanaganPatrick SuttonPeter MertzPratik MukherjeeRichard DeightonRobert C SchuppRobert IlardiRobert WalterRuss CreechScott GossettShane CalimlimSimon OliphantSteven SartoreTim StephaniTonyfaceTybie FitzhughYannick WeynsYurii Konovaliuk Learn more about your ad choices. Visit megaphone.fm/adchoices Learn more about your ad choices. Visit megaphone.fm/adchoices