School of Astroparticle Physics
May 27th - June 1st, 2013
OHP, Saint Michel l'Observatoire

Gravitational Waves

Third generation earth-based interferometric gravitational-wave detectors

Astroparticule et Cosmologie (APC)

In the first part of this lecture I will recall the scientific interests of a third generation earth-based gravitational-wave (GW) detector (a detector with a sensitivity improvement of about an order of magnitude with respect to the second generation detectors, like Advanced Virgo and Advanced LIGO) for the fundamental physics, the astrophysics and the cosmology. In the second part I will describe the planned techniques to reduce the noises limiting the sensitivity of Advanced Virgo and Advanced LIGO, (quantum noise, thermal noise and seismic noise). In the third part I will show the plans for a third generation detector in Europe (Einstein Telescope) and in the US ("LIGO III").
  1. Science with a third generation detector
    1. Fundamental physics
    2. Astrophysics
    3. Cosmology
  2. Techniques reduce the noises limiting  the 2nd generation detector
    1. Quantum noise
    2. Seismic noise
    3. Thermal noise
  3. Plans for the construction of a third generation detector
    1. In Europe: Einstein Telescope
    2. In the US: "LIGO III"


In the next 5 years second generation gravitational-wave detectors (Advanced Virgo, Advanced LIGO, KAGRA, GEO-HF) will almost surely make the first direct detection of gravitational-waves and then they will start the field of the gravitational-wave astronomy. While building these instruments, the scientific community has already started to prepare the next (3rd) earth-based generation detectors (as the European project Einstein Telescope), with a planned sensititivy increase of an order of magnitude. The scientific interests of the 3rd generation detectors, the involved technologies and the plans to build them will be discussed here.

    • Scientific Objectives of the Einstein Telescope, B.Sathyprakash et al. , arXiv:1206.0331
    • Scientific potential of Einstein Telescope, B.Sathyprakash et al., arXiv: 1108.1423
    • Einstein gravitational wave telescope conceptual design study, M.Abernathy et al.
    • Optical coatings and thermal noise in precision measurements,  Ed. G.Harry et al., Cambridge University Press 
    • Instrument Science White Paper, LIGO Scientific Collaboration,


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