A Window into the Early Universe with Heavy Ions

Clara Leitgeb

on behalf of the DGB Collaboration

European School of HEP: Sept 15th 2019

Big Bang

Time

Temperature

1

Big Bang

Time

Temperature

We are here

?

1

What are we made of?

Quark-gluon plasma

Temperature

Matter

Atom

Electron

Nucleus

Proton

Neutron

Quark

Gluon

Temperature

2

Initial state

Hard collision

Evolution

Cold matter

Heavy Ion collisions

3

4

x 1012 °C

2.6

2.4

2.2

2.0

1.8

1.6

arXiv: 1009.3244

Heavy Ion collisions

4

5.20

5

🔥 1 000°C

🌞 16 000 000°C

LHC 5 500 000 000 000°C

5.50

6

6.40

arXiv: 1105.3865

6

6

So, what is it?

7

7.15

So, what is it?

7

(Almost) Perfect Fluid

So, what is it?

(Almost) Perfect Fluid

7

Viscosity

QUARK GLUON PLASMA

8

arXiv: 1105.3865

9

(Almost)

Perfect Fluid

8

Big Bang

Time

Temperature

We are here

10

Big Bang

Time

Temperature

We are here

?

10

Thank you for your attention!

I already love this

BACKUP

Future Directions

  • Small systems

Can we see QGP in less complicated systems as well?

  • Transition region

Does it cool down exactly the way we expect?

  • Other QGP properties

Can we tame this new matter for daily-life application?

  • New Accelerator Projects

NICA from JINR (Dubna)

11

9.50

I already love this

Viscosity

arXiv:1004.1408

Can someone put reference on wikipedia? https://commons.wikimedia.org/wiki/File:Viscosities.gif

arXiv:1904.08290v1

And we use it!

Time

PRL 107, 032301 (2011)

Big Bang

Time

Temperature

You are here

100°C

-270°C

?

1000000°C

1000°C

Initial state

Hard collision

Evolution

Cold matter

Heavy Ion collisions

3

4

Group B - Heavy Ion Physics - Google Slides