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Who’s Afraid Of A Small Black Hole?Lucas Ellerbroek

Institute for Theoretical Physics, UvA, Amsterdam

Who’s afraid of a small black hole?

What is a black hole? How can we create one? Why is that not dangerous? What would we learn from that?

What is a black hole? Very dense object Gravity deforms spacetime Event Horizon at RSchw

Black hole species:

Supermassive

M ~ 1040 kg

Stellar

M ~ 1030 kg

Primordial

M ~ 1012 kg

Microscopic

M ~ 10-27 kg

Can we create a black hole?

Black hole creation is impossible! Or is it...?

EXTRA DIMENSIONS

High-energy collision:

Minimum size of black hole = Mpl= Minimal mass for gravity

At the LHC:

Higher Dimensional scenarios

4D Brane(visible universe)

Bulk space(n extra dimensions)

M

if Mpl ~ 1 TeV: Black holes at LHC!

We have created an all-eating monster!!

Mpl lower than in 4DGravity on brane:

R ~ 1 mm

Why is the LHC black hole not dangerous?

Stephen Hawking:Black holes have a temperature

Hawking Evaporation

Black holes are thermal blackbodies The smaller, the hotter:

LHC black holes will evaporate instantaneously: If Hawking radiation does not exist, they will escape from Earth anyway

Discover hidden dimensions Solve hierarchy problem Observe Hawking radiation Observe Quantum-gravitational effects Explain cosmic dark matter

What can we learn from a mini black hole?

Plasma

Gold nuclei

Creating a stable black hole: science or fiction?

BlackHole

Protons TBH < TPlasma

Conclusion Creating a black hole: proof for extra dimensions It evaporates immediately: don’t be afraid Detection would lead to major discoveries Predict methods to create a stable black hole