Sven Köppel The Generalized Uncertainty Principle...

Sven Köppel

The Generalized Uncertainty Principleand Extra Dimensions

Geometry and Physics seminarDFT at IFIN-HH, Bucharest

September 25, 2015

Coworkers:

Marco KnipferPD Dr. Piero Nicolini

Maximiliano IsiProf. Jonas Mureika

Sven Köppel

Sven Köppel: 3 / 53Sven Köppel: GUP-inspired Black Holes and Extra Dimensions

OutlineWhy do we need models for Quantum Black Holes?

Modifying Heisenberg's uncertainty principle

Features of a certain class of nonlocal gravity spacetimes

Extension to Large extra dimensions

Further extensions / comments about ...

… Analytic continuation to negative radii

Motivation: Why minimal length physics?

Aurilia, Spallucci 2002Dvali, Gomez 2010Carr 2014

UV-Complete Gravity,Minimal length

The Planck scale

Constrain physicallyallowed region

The Planck scale

Schwarzschild BHs exhibit problems

The Schwarzschild black hole is not suitable to describe „smallest distances“:

Curvature singularity ill defined thermodynamics

Quantum black holes in nature?

Carr 2014Bleicher, Nicolini 2010, 2014

Primordial black holes

Black Hole

Evaporate ~ „now“

Primordial black holes Particle accelerators

Black Hole

Immediately evaporatesEvaporate ~ „now“

10 TeV: Requires extra dimensions!

Black hole evaporation

Remnants: Candidates for cold dark matterHossenfelder 2004Hossenfelder LRR 2013

Effective quantum gravity equations

Quantum matter

Nonlocal spacetime

dual theory

Nonlocal operatorInfluenced by one of:

String theoryLoop quantum gravityAsymptotically safe gravityNoncommutative geometry

HeavisideStep function

Cumulatedmass

„Smeared“Mass

Cumulatedmass

DiracDelta function

Occuring inT_{00}

„Smeared“Mass

A quantum theory of gravity must be nonlocal

The Generalized Uncertainty Principleas a guiding principle for the quantum corrections to GR

Veneziano 1986Amati, Veneziano, Ciafaloni 1995Michele Maggiore 1995Kempf, Mangano, Mann 1996

The Generalized Uncertainty Principleas a guiding principle for the quantum corrections to GR

Veneziano 1986Amati, Veneziano, Ciafaloni 1995Michele Maggiore 1995Kempf, Mangano, Mann 1996

Physically allowed regionby GUP prediction

GUP: Approximation to Temperature: Hot remnants

Adler, Santiago 1999Adler, Chen, Santiago 2001

Hot evaporation endpoint

Hawking temperature

GUP: Exploiting a Hilbert space representation

Hilbert spacerepresentation

Kempf, Mangano, Mann 1996

Approximationin nonlocal Lagrangiangives nonlocal EFE

Krasnikov 1987,Modesto 2012, 2013Moffat 2012Choose

Isi, Mureika, Nicolini 2013Balazin, Nachbagauer 1994

What is the effect ona Schwarzschild BH?

Modified Newton'spotential

Analytical result:

Isi, Mureika,Nicolini 2013

GUP inspired Black holes: Self completeness

Self complete: Can relate free parameter to fundamental length

The black hole remnant: thermodynamics

semiclassical regimecooldownphase

inaccessibleregime

Temperature:

inaccessibleregime

Phase transitionHeatcapacity

Temperature:

31 / 53

inaccessibleregime

Phase transitionHeatcapacity

Temperature:

Entropy

The remnant:A cold stableevaporationendpoint

Extension of such models

Alternative theories of gravity:Large extra dimensions+ Terascale physics+ Hawking emission on brane/bulk

or adding more complexity+ Angular momentum+ Electrical charge+ AdS background

Adressing the weak hierarchy problem of the Standard Model

Elektroweak scalevs.

Planck scale

Large Extra Dimensions

ADD scenario

Integrated huge Volume ofextra dimensions

Large µm up to mm

Large Extra Dimensions

ADD scenario

Integrated huge Volume ofextra dimensions

Large µm up to mm

Arkani-HamedDimopoulosDvali 1998

The Kempf-Mangano-Mann model in N+1 dimensions

Apply the momentum space regularization in N spatial dimensions (ADD model)

Kempf, Mangano, Mann 1996Scardigli, Casadio 2003

The Kempf-Mangano-Mann model in N+1 dimensions

Apply the momentum space regularization in N spatial dimensions (ADD model)

Kempf, Mangano, Mann 1996Scardigli, Casadio 2003

We can solve the nonlocal operator analytically in any number of extradimensions

One extra dimension

GUP-inspired BH in higher dimensions

One extra dimension

More than one extra dimension

No more remnants in higher (N > 4) dimensions.

One extra dimension More than one extra dimension

Adler 2010Carr 2014

Retracing a popular Gedankenexperiment

The Heisenberg microscope in n LXDs:

This Gedankenexperiment motivates a modified GUP:

Constant integrand: Sounds reasonable

We can solve this spacetime analytically in any dimension.

Adler 2010Carr 2014

Retracing a popular Gedankenexperiment

The Heisenberg microscope in n LXDs:

Modified GUP inspired Black Holes

Gravitational potential with 4 extra dimensions:

Gravitational potential with 1 extra dimension:

Pathologies!

Gravitational potential with 4 extra dimensions:

GUP in extra dimensions: Ways out

Maziashvili 2013

• Improve GUP. Example:

Maziashvili 2013

• Improve NLG. Include higher derivative terms in nonlocal operator

Maziashvili 2013

• Improve NLG. Include higher derivative terms in nonlocal operator

• Propose nonsingular model.Model engineering

Hayward 2006

Analytical continuation

Schwarzschild BH

GUP-inspired BH

Finite curvature BH

Softening the Ricci curvature scalar divergence

Schwarzschild BH

GUP-inspired BH

Finite curvature BH

Softening the Ricci curvature scalar divergence

Analytical continuation:

Sven Köppel

Thank you for your attention!

References

Ongoing

Isi, Mureika, NicoliniSelf-Completeness and the GUP[JHEP 2013]

Köppel, Isi, Knipfer, Mureika, NicoliniSelf-Completeness and the GUPin extradimensions

Köppel, Knipfer, Dirkes, Frassino, Nicolini, BleicherGUP and BHs – a pedagogical review

Sven Köppel The Generalized Uncertainty Principle...

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