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Summary of session C6: Q&A—everything you wanted to know about gravitational waves but were afraid to ask


The paper summarizes the parallel session C6 Q&A—everything you wanted to know about gravitational waves but were afraid to ask of the joint 10th Amaldi Conference on Gravitational Waves and 20th International Conference on General Relativity and Gravitation.

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  1. 1.

    In principle one could consider the re-emission by the system made by the beam-splitter and the mirror, which has a time-varying quadrupole \(Q_{xx}(t)\simeq \mu \xi ^2(t)\). From the standard Einstein quadrupole formula \(dE/dt|_{emitted}= G_N{\mathop {Q}\limits ^{\ldots }_{ij}}^2/5\sim G_N\mu ^2L^4\omega _{GW}^6h_0^2\), which can be compared to the absorption given from Eq. (10) to obtain \(dE/dt|_{emitted}\sim dE/dt|_{absorbed}\times 6\times 10^{-22} \left( \frac{\omega _0}{2\pi Hz}\right) ^{-1} \left( \frac{\omega _{GW}}{2\pi kHz}\right) ^4\left( \frac{Q}{10^8}\right) \left( \frac{\mu }{1kg}\right) \left( \frac{L}{3km}\right) ^2\), hence completely negligible.

  2. 2.

    Actually, we use the respondent’s prerogative to answer in a different spirit: in honour of our host nation, the respondent offers in wager a bottle of his favourite vodka [65].

  3. 3.

    Respondent’s prerogative again: we round up to 3 months.


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Correspondence to V. Fafone.

Additional information

V. Fafone is C6 session’s co-chairperson.

P. J. Sutton is C6 session’s co-chairperson and contributor.

This article belongs to the Topical Collection: The First Century of General Relativity: GR20/Amaldi10.

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Fafone, V., Sutton, P.J., Cornish, N. et al. Summary of session C6: Q&A—everything you wanted to know about gravitational waves but were afraid to ask. Gen Relativ Gravit 46, 1782 (2014).

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  • Gravitational radiation
  • Theory
  • Detectors
  • Sources