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The Evolution of the Universe
*
John D. Barrow
Are You
Expanding
???
There is no centre
and
there is no edge
A Recipe for Life
helium + helium  beryllium
helium + beryllium  carbon
carbon + helium  oxygen
Why is the Universe so
Big ?
hydrogen  helium  carbon
10 billion years of alchemy
10 billion years of expansion
10 billion light years of space
The Universe
is
Almost Empty
The Universe contains only
1 Atom per cubic metre
1 Earth per (10 l–yr)3
1 Star per (1000 l–yr)3
1 Galaxy per (107 l–yr)3
10
3
1 ‘universe’ per (10 l–yr)
Our Universe
Is
Cool
T  1/size
The Sky is Dark
at Night
Life-supporting Space is….
Almost empty
Big and Old
Dark and Cold
Habitable Universes
Need
Close to critical expansion
Isotropic expansion
Graininess level of about
1 part in 105
The Inflationary Universe
Very early  10-35 sec
Planck Mission Microwave Sky Map
The Spectrum of Temperature Fluctuations
A Cosmological Cornucopia
Changing the visible
matter density
Wayne Hu
Changing the dark
matter density
Wayne Hu
Gravitational-Wave ‘Twist’ Signature
in the radiation polarisation
BICEP 2, 2014
The Universe is Dusty
Planck Dust Map
Chaotic Inflation
Eternal Inflation
Will the Universe
Expand
Forever
???
The Violent End of the Solar System
Dark energy () and deviation from critical expansion (k)
Wayne Hu
Dark Energy Dominates the Universe