Monthly Archives: February 2020

Scattering and the S-matrix

Scattering and the S-matrix

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A couple of faint galaxies

NGC 2507 (Spiral galaxy in Cancer) NGC 2538 (Spiral galaxy in Canis Minor)

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3 faint astrophotos

Three astrophotos taken during the brief respite in the stormy and windy weather. They’re not very impressive, so don’t get your hopes up. IC 2165 (Planetary nebula in Canis Major) NGC 2346 (Planetary nebula in Monoceros) NGC 2485 & PGC … Continue reading

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Dyson’s formula and time ordering

Dyson’s formula and time ordering

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Galaxies and planetary nebulas

NGC 1784 (Barred spiral galaxy in Lepus) NGC 2339 (Spiral galaxy in Gemini) NGC 2371 (Planetary nebula in Gemini) NGC 2392 (Eskimo planetary nebula in Gemini)

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Schrödinger, Heisenberg and interaction pictures

Schrödinger, Heisenberg and interaction pictures

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Time reversal

Time reversal

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