The Evolution of the Universe The Evolution of the Universe* John D. Barrow.

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Evolution of the Uni Evolution of the Uni * * John D. Barrow John D. Barrow

Transcript of The Evolution of the Universe The Evolution of the Universe* John D. Barrow.

Page 1: The Evolution of the Universe The Evolution of the Universe* John D. Barrow.

The Evolution of the UniverseThe Evolution of the Universe**

John D. BarrowJohn D. Barrow

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Are You Are You ExpandinExpandin

gg??????

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There is no centreThere is no centre and and

there is no edgethere is no edge

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A Recipe for LifeA Recipe for Life

helium + helium helium + helium berylliumberyllium

helium + beryllium helium + beryllium carboncarbon

carbon + helium carbon + helium oxygenoxygen

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Why is the Universe so Why is the Universe so

Big ?Big ?hydrogen hydrogen helium helium carboncarbon10 billion years of 10 billion years of alchemyalchemy10 billion years of 10 billion years of expansionexpansion10 billion light years of 10 billion light years of spacespace

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The Universe The Universe is is

Almost EmptyAlmost Empty

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The Universe contains The Universe contains onlyonly

1 Atom per cubic metre1 Atom per cubic metre1 Earth per (10 l–yr)1 Earth per (10 l–yr)33

1 Star per (1000 l–yr)1 Star per (1000 l–yr)33 1 Galaxy per (101 Galaxy per (1077 l–yr) l–yr)33

1 ‘universe’ per (101 ‘universe’ per (101010 l–yr) l–yr)33

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Our Our UniverseUniverse

IsIsCoolCool

T 1/size

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The Sky is Dark The Sky is Dark at Nightat Night

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Life-supporting Space is….Life-supporting Space is….

Almost emptyAlmost emptyBig and OldBig and Old

Dark and ColdDark and Cold

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Habitable UniversesHabitable UniversesNeedNeed

Close to critical expansionClose to critical expansionIsotropic expansionIsotropic expansion

Graininess level of aboutGraininess level of about 1 part in 10 1 part in 1055

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The Inflationary UniverseThe Inflationary Universe

Very early 10-35 sec

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Planck Mission Microwave Sky MapPlanck Mission Microwave Sky Map

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The Spectrum of Temperature FluctuationsThe Spectrum of Temperature Fluctuations

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Changing the visible matter density

Wayne Hu

Changing the dark matter density

Wayne Hu

A Cosmological CornucopiaA Cosmological Cornucopia

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Gravitational-Wave ‘Twist’ Signature Gravitational-Wave ‘Twist’ Signature in the radiation polarisationin the radiation polarisation

BICEP 2, 2014

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Planck Dust Map

The Universe is DustyThe Universe is Dusty

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Chaotic InflationChaotic Inflation

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Eternal InflationEternal Inflation

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Will the Universe Will the Universe Expand Expand ForeverForever

??????

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The Violent End of the Solar SystemThe Violent End of the Solar System

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Dark energy () and deviation from critical expansion (k)Wayne Hu

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Dark Energy Dominates the UniverseDark Energy Dominates the Universe

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