2019-11-06

[public] 554K views, 24.8K likes, 388 dislikes audio only

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This video is about two-photon (gamma-gamma) physics, and how photons can interact with each other - either mediated by a passing lepton, or gravitationally via lensing, or via vacuum fluctuation pair production of vertical particles (electron-positron pair, for example). This is the so-called "box diagram" feynman diagram.

REFERENCES

Water waves interact with each other (weakly nonlinear shallow water waves)

https://en.wikipedia.org/wiki/Korteweg%E2%80%93deVriesequation

http://mathworld.wolfram.com/Korteweg-deVriesEquation.html

Paper: Absorption of Very High Energy Gamma Rays in the Milky Way

https://arxiv.org/pdf/1608.01587.pdf

Paper: Observing light-by-light scattering at the Large Hadron Collider (LHC)

https://arxiv.org/pdf/1305.7142.pdf

Mass-Energy Scale

http://labs.minutelabs.io/Mass-Energy-Scale/

Optical Depth

https://en.wikipedia.org/wiki/Opticaldepth

The electromagnetic spectrum and photon energies

http://labman.phys.utk.edu/phys222core/modules/m6/The%20EM%20spectrum.html

Gravitational Lensing

http://andybohn.com/research/lensing.html

Ask an Astrophysicist on gamma ray scattering and energies in cosmology

http://teacherlink.ed.usu.edu/tlnasa/reference/imaginedvd/files/imagine/docs/askastro/answers/970412e.html

Measuring Vacuum Polarisation with High Power Lasers

https://arxiv.org/pdf/1510.08456.pdf

Detecting vacuum birefringence with X-ray free electron lasers and high-power optical lasers

https://indico.desy.de/indico/event/12654/session/2/contribution/8/material/slides/0.pdf

Vacuum birefringence in the head-on collision of XFEL and optical high-intensity laser pulses

https://arxiv.org/pdf/1807.03302.pdf

ATLAS makes first direct detection of Light-by-light scattering at the LHC

https://atlas.cern/updates/press-statement/atlas-sees-first-direct-evidence-light-light-scattering-high-energy

Two Photon Physics

http://www.hep.ucl.ac.uk/opal/gammagamma/gg-tutorial.html

https://en.wikipedia.org/wiki/Two-photonphysics

Thesis: The Opacity of the Universe for high and very high energy γ-rays

http://inspirehep.net/record/1254304/files/desy-thesis-13-033.pdf

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