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**Shared November 6, 2019**

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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/Kortewe...

http://mathworld.wolfram.com/Korteweg...

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...

Optical Depth

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

The electromagnetic spectrum and photon energies

http://labman.phys.utk.edu/phys222cor...

Gravitational Lensing

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

Ask an Astrophysicist on gamma ray scattering and energies in cosmology

http://teacherlink.ed.usu.edu/tlnasa/...

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/1...

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-stat...

Two Photon Physics

http://www.hep.ucl.ac.uk/opal/gammaga...

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

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

http://inspirehep.net/record/1254304/...

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Minute Physics provides an energetic and entertaining view of old and new problems in physics -- all in a minute!

Created by Henry Reich

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