# Surprising consequence of a positive cosmological constant

### APA

Bonga, B. (2016). Surprising consequence of a positive cosmological constant. Perimeter Institute. https://pirsa.org/16090043

### MLA

Bonga, Beatrice. Surprising consequence of a positive cosmological constant. Perimeter Institute, Sep. 08, 2016, https://pirsa.org/16090043

### BibTex

@misc{ pirsa_PIRSA:16090043, doi = {10.48660/16090043}, url = {https://pirsa.org/16090043}, author = {Bonga, Beatrice}, keywords = {Quantum Gravity}, language = {en}, title = {Surprising consequence of a positive cosmological constant}, publisher = {Perimeter Institute}, year = {2016}, month = {sep}, note = {PIRSA:16090043 see, \url{https://pirsa.org}} }

Beatrice Bonga Radboud Universiteit Nijmegen

## Abstract

The study of isolated systems has been vastly successful in the context of vanishing cosmological constant, $\Lambda = 0$. However, there is no physically useful notion of asymptotics for the universe we inhabit with $\Lambda > 0$. The full non-linear framework is still under development, but some interesting results at the linearized level have been obtained. I will focus on the conceptual subtleties that arise at the linearized level and discuss the quadrupole formula for gravitational radiation.