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Dark Energy, the Hubble Problem and Gravitational-wave Propagation

Miguel Zumalacárregui

Alternative theories of gravity may provide viable cosmological models with the possibility of alleviating shortcomings of the standard paradigm. I will present mechanisms to reconcile the Hubble parameter beyond General Relativity, testing them against cosmological data and discussing their implications for precision tests of gravity. I will also present how theories beyond GR affect the propagation of gravitational waves. The speed of gravitational waves provides the most stringent test for a large class of theories after the neutron star merger GW170817. I will also discuss how other propagation effects (damping, modified dispersion and oscillations), and instabilities induced by passing gravitational waves can be used to test the landscape of gravitational theories.

2020 April 15, 16:30

Online broadcast (Zoom)

Instituto de Astrofísica e Ciências do Espaço Universidade do Porto Faculdade de Ciências da Universidade de Lisboa
Fundação para a Ciência e a Tecnologia COMPETE 2020 PORTUGAL 2020 União Europeia