Molecular-dynamics simulations to study dissipation in amorphous materials for optical applications in gravitational wave detectors.

Puosi F., Fidecaro F., Leporini D., Capaccioli S., Pisignano D.

III - Astrofisica
Aula GSSI Rettorato - Auditorium - Venerdì 27 h 09:00 - 12:00
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In interferometric gravitational wave detectors, thermal noise from the mirrors, originating from mechanical dissipation in the coating films, represents the major limitation to sensitivity. Significant experimental effort has led to improvements during these years and currently the most advanced technology is the one of amorphous coatings. Yet, there is still a lack of understanding of the involved dissipation mechanisms. In this work we study dissipation in glasses applying the experimental protocol of the mechanical spectroscopy to atomistic simulations. Our results exhibit impressive agreement with the existing experimental data, suggesting that in silico mechanical spectroscopy has an interesting predictive potential.

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