EXOTIC PHYSICS with ELIWhat is in the proposal and what is

expected to be done in the first place

K. Rohlena

Institute of Physics Academy of Sciences of the Czech Republic

EXOTIC PHYSICS with ELI

Intensity thresholds for relativisticand quantum effects

1.3×1018 W/cm2 relativistic electron quivermotion

1×1023 W/cm2 radiation damping

5×1023 W/cm2 attainable ELI Beamlinesintensity

1.3×1024 W/cm2 relativistic proton quivermotion

5.6×1024 W/cm2 quantum effects

2.4×1029 W/cm2 Schwinger field

EXOTIC PHYSICS with ELI

Spectra of electrons and positrons measured in 600 J/0.5 ps shot on 125 mm Au target. Histograms show PIC simulation of electrons, and corresponding prediction for positron creation by Bremsstrahlung in

the Au target

[T.E. Cowan et al., Nucl. Instr. Meth. Phys. Res. A 455 (200) 130-139]

Positron production

EXOTIC PHYSICS with ELI

Electron-positron pair production. An electron beam intersects a laser pulse, boosting photons to gamma energies and triggering an

interaction that spawns particles

[Volume 277, Number 5330 Issue of 29 August 1997, p. 1202, The American Association for the Advancement of Science]

EXOTIC PHYSICS with ELI

Double illumination of a target with two petawatt laser beams could lead to the production of the electron-positron pair plasma

[The Science and Applications of Ultrafast, Ultraintense Lasers. A report on the SAUUL workshop held (2002)]

EXOTIC PHYSICS with ELI

In the Inverse Compton Scattering a laser pulse collides with an electron bunch. The Doppler energy upshifts the scattered

photons to high energies, e.g. 100 MeV γ -rays with a 10-GeV electron beam.

[Harvey et al., Phys. Rev. Lett. 79 (2009) 063407]

EXOTIC PHYSICS with ELI

Cascading of inverse Compton scattering and pair formation

EXOTIC PHYSICS with ELI

Scattering of photons on photons: Configuration of 4-wave interaction: the incoming laser beams (represented by the wave vectors k1, k2 and k3)

and the direction of the scattered wave (with wave vector k4).

[Moulin, F., Bernard, D. Optics Communications 164 (1999) 137-144]

EXOTIC PHYSICS with ELI

The vacuum birefringence turns the linear polarization of the laser beam into the elliptical one in presence of strong magnetic field

[S.Y. Buhmann. On the search for nothing: Vacuum birefringence and Casimir-Polder forces, Institutsseminar TPI 2005 FSU Jena]

EXOTIC PHYSICS with ELI

The experimental scheme for the vacuum birefringence observation

[S. Y. Buhmann. On the search for nothing: Vacuum birefringence and Casimir-Polder forces, Institutsseminar TPI 2005 FSU Jena]

EXOTIC PHYSICS with ELI

Possible experimental arrangement for proving the vacuum birefringence using a “photon collider”

[E. Brezin and C. Itzykson, Phys. Rev. D3, 618 (1970)]

EXOTIC PHYSICS with ELI

Two-photon amplitudes for Unruh radiation on the left side and Larmor radiation on the right side

[W. G. Unruh and R. M. Wald, Phys. Rev. D 29, 1047 (1984), R. Schützhold, G. Schaller and D. Habs, Phys.Rev.Lett. 97 (2006);

R. Schützhold, Gernot Schaller and Dietrich Habs, Phys.Rev.Lett. 97 (2006)]

EXOTIC PHYSICS with ELI

AXION checkAxions - calibration particles beyond the

standard model - natural explanation of CP symmetry in the strong interactions.

In a magnetic field: transformation

photons axions.

Axions pass through a thick Al slab changing spontaneously back to the photons

axions photons.An experiment would consist in firing the laser into a perpendicular vacuum magnetic field and monitoring the photons in the slab shadow.

EXOTIC PHYSICS with ELIWhat would make sense to

start with:(1) Formation of positron beams and

possibly electron-positron plasma (1023 W/cm2)

(2) Magnetic field (5 T) vacuum birefringence experiment possibly with an x-ray probe (1022 W/cm2) combined with axion check (large statistics)