Publié sur *Groupe de Physique des Particules* (https://www.lps.umontreal.ca)

Béatrice Bonga

Perimeter Institute for Theoretical Physics

Résumé:

Einstein’s celebrated quadrupole formula lies at the foundation of the first indirect evidence for gravitational waves: it explains with high precision the shrinking of the orbital radius of the Hulse-Taylor system. The formula expresses the power radiated in the form of gravitational radiation in terms of the source quadrupole moments. However, the derivation assumes a flat spacetime background, but there is strong observational evidence for a positive cosmological constant. To account for this, the quadrupole formula is generalized by replacing the flat spacetime background with a de Sitter spacetime. In this talk, I will focus on the conceptual subtleties that arise and comment on physical implications.

Date:

Mardi, 21 Novembre, 2017 - 11:00

Lieu de Séminaire:

Z-209, Pav. Claire-McNicholl

Café et biscuits:

V-215 10:45, coffee and cookies

**Liens:**

[1] https://www.lps.umontreal.ca/sites/default/files/Montreal-pdf.pdf