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Day 2: Polarisation of the CMB Eiichiro Komatsu [Max Planck - PowerPoint PPT Presentation

Jul 02, 2023 •27 likes •1.01k views

Lecture notes: https://wwwmpa.mpa-garching.mpg.de/~komatsu/lectures--reviews.html Day 2: Polarisation of the CMB Eiichiro Komatsu [Max Planck Institute for Astrophysics] University of Amsterdam March 5, 2020 How do we measure gravitational

  1. Lecture notes: https://wwwmpa.mpa-garching.mpg.de/~komatsu/lectures--reviews.html Day 2: Polarisation of the CMB Eiichiro Komatsu [Max Planck Institute for Astrophysics] University of Amsterdam March 5, 2020

  2. How do we measure gravitational waves?

  3. Measuring GW • GW changes distances between two points X d ` 2 = d x 2 = � ij dx i dx j ij d ` 2 = X ( � ij + h ij ) dx i dx j ij

  4. Laser Interferometer Mirror Mirror detector No signal

  5. Laser Interferometer Mirror Mirror detector Signal!

  6. LIGO detected GW from a binary blackholes, with a frequency of ~100 Hz = the wavelength of thousands of kilometres But, the primordial GW affecting the CMB has a frequency of 10 –18 Hz = the wavelength of billions of light-years !! How do we find it?

  7. Detecting GW by CMB Isotropic electro-magnetic fields

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