Public talk at the Artis Planetarium, Amsterdam.

1. Daniel Baumann
OUR UNIVERSE
From the Big Bang to the Multiverse

2. The Big Bang 14 billion years ago

3. First Light 400,000 years later

4. 400,000 years 13.8 billion years
Cosmic Structures A few billion years later

5. Where Did It All Come From?
?
400,000 years 13.8 billion years
10-32 sec

6. Cosmic In
fl
ation
Size of the observable
universe after in
fl
ation
<< Size of an
atomic nucleus

7. Origin of Structure
Primordial density
fl
uctuations
Quantum
fl
uctuations

8. Current Evidence
2 10 30
0
1000
2000
3000
4000
5000
6000
Power
[µK
2
]
500 1000 1500 2000 2500
Multipole
90◦
18◦ 1◦
0.2◦
0.1◦
0.07◦
Angular separation
Blob size
Number
of
blobs

9. Future Test Gravitational
waves
Quantum
fl
uctuations

10. The Multiverse

11. • In
fl
ation predicts a Multiverse:
• It is our best answer to the questions:
Why is the Universe Big?
Why Does It Have Big Objects In It?
Dark
energy
Higgs
mass

12. The Multiverse
Vacuum energy
In
fl
ating space

13. Our Universe
Another universe
The Multiverse

14. New bubble universe
In
fl
ating space
The Multiverse

15. The Multiverse

16. ⇤1
Why This Universe?
⇤1
⇤3
We live where we can live, which is a big universe with big objects in it.
⇤2
No galaxies
Universe recollapses
⇤2 ⇤3
Dark
energy
Life
Our Universe

17. “Whatever the
fi
nal laws of Nature may be, there is no reason to
suppose that they are designed to make physicists happy.”
Weinberg
I don't like the Multiverse.