m.marklund-finite size effect in pair production, nonperturbative quantum fields, and fundamental...
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8/4/2019 M.marklund-Finite Size Effect in Pair Production, Nonperturbative Quantum Fields, And Fundamental Physics With ELI
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Finite size effect in pair production,
nonperturbative quantum fields,
and fundamental physics with ELI
Mattias MarklundDepartment of Physics
Ume UniversitySweden
ELI Beamlines Scientific Challenges WorkshopPrague, Apr 26-27, 2010
Supported by the ERC
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Overview
Background.
The quantum vacuum.
Pair production
Mechanisms and field structure effects.
Importance of pulse shape.
The Unruh effect.
Hawking radiation and black holes.
Noncommutativity.
Spacetime structure in the lab?
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Overview
Background.
The quantum vacuum.
Pair production
Mechanisms and field structure effects.
Importance of pulse shape.
The Unruh effect.
Hawking radiation and black holes.
Noncommutativity.
Spacetime structure in the lab?
Ordero
fdifficulty
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Bakground: opportunity with
ELI
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The Nonlinear Vacuum
Special Relativity + quantum mechanics = virtualparticle pair fluctuations.
Properly described by QED.
Photons can effectively interact via pair fluctuations.
Vacuum has properties, constitutes a virtual pairplasma: dispersive, dissipative, nonlinear, birefringent,polarizable (Lundstrm et al., 2006, King et al. 2010).
Low-energy photons:
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Pair production
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Pair production
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Burke et al., PRL 79, 1626 (1997)
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Pair production
Pulse shape dependence instimulated production (Heinzlet al. 2010).
The differential cross sectionplotted as a function of
transverse positronmomentum for a pulsed planewave with 4 fs, 8 fs, and 16 fslaser pulses (top to bottom)(Krausz and Ivanov 2009;Mackenroth et al. 2010).
Longer pulses gives rise todelta-like comb.
Finite width gives ratestructure and sub-thresholdpeak.
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Pair production
Important because:
Nonperturbative QED.
Ionisation dynamics (e.g. Reiss, PRL 2008; Blaga etal., Nature Phys. 2009).
Nonlinear scattering events (Heinzl et al., PRA 2010).
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The Unruh effect
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Thermodynamics
Spacetimestructure
Quantum fields
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The Unruh effect
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Thermodynamics
Spacetimestructure
Quantum fields
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The Unruh effect
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Thermodynamics
Spacetimestructure
Quantum fields
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The Unruh effect
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Thermodynamics
Spacetimestructure
Quantum fields
Use weakly focused ELIto avoid competing noisesources.
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Noncommutativity
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Noncommutativity
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Tool for analyzing deviations
from standard models
Effects through parametrized generalized MaxwellDirac system (Lmmerzahl, Appl. Phys. B, 2006)
-Birefringence.-Anisotropic speed of light.
-Anisotropy in quantum fields.-Violations of universality of free fall and theuniversality of the gravitational redshift.
-Time and space variations of constants.-Charge non-conservations.
-Anomalous dispersion.-Decoherence and spacetime fluctuations.-Modified interference.-Non-localities.
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Theoretical developments?
Pair production one aspect ofmore complex dynamicalproblem.
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Theoretical developments?
Pair production one aspect ofmore complex dynamicalproblem.
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Non-relativistic QMWave function dispersion
Electron correlation
Tunneling
Lowest order relativistic QM
Magnetization
Spinorbit coupling
Relativistic QM
FermiDirac statisticsZitterbewegung
QFT
Pair production
Sourced plasmas
Energ
yandint
ensity
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Theoretical developments?
Pair production one aspect ofmore complex dynamicalproblem.
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Non-relativistic QMWave function dispersion
Electron correlation
Tunneling
Lowest order relativistic QM
Magnetization
Spinorbit coupling
Relativistic QM
FermiDirac statisticsZitterbewegung
QFT
Pair production
Sourced plasmas
Coherent(computational)
theory?
Energ
yandint
ensity
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Conclusions
Pair production contains a rich substructure.
Can give information about the pp process,
can give information about the pulse,
can teach us something about ionization andscattering events.
Gives input into nonperturbative quantum fieldtheory.
Detailed pulse shapes? Subcycle structure? Hopefully a first step towards analysing
fundamental physical question, highly complex relativistic processes.
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