PIRSA:24070040

Gravitational wave generation in effective field theories of dark energy

Barausse, E. (2024). Gravitational wave generation in effective field theories of dark energy. Perimeter Institute. https://pirsa.org/24070040

Barausse, Enrico. Gravitational wave generation in effective field theories of dark energy. Perimeter Institute, Jul. 17, 2024, https://pirsa.org/24070040 

          @misc{ pirsa_PIRSA:24070040,
            doi = {10.48660/24070040},
            url = {https://pirsa.org/24070040},
            author = {Barausse, Enrico},
            keywords = {Cosmology, Strong Gravity, Mathematical physics},
            language = {en},
            title = {Gravitational wave generation in effective field theories of dark energy},
            publisher = {Perimeter Institute},
            year = {2024},
            month = {jul},
            note = {PIRSA:24070040 see, \url{https://pirsa.org}}
          }

Enrico Barausse

SISSA International School for Advanced Studies

Talk number
PIRSA:24070040
Collection
Talk Type
Subject
Abstract
I will present the class of effective field theories of dark energy, which aim to reproduce a dark energy-like phenomenology by modifying general relativity with the addition of a scalar graviton. I will review how non-linearities can "screen" local scales from scalar effects, therefore allowing these theories to pass existing solar-system experimental tests. I will then present fully relativistic simulations of gravitational wave generation in these theories in 1+1 dimensions (stellar oscillations and collapse) and 3+1 dimensions (binary neutron stars). I will show that screening tends to suppress the (subdominant) dipole scalar emission in binary neutron star systems, but it fails to quench monopole scalar emission in gravitational collapse, and quadrupole scalar emission in binaries. This opens the way to the exciting possibility of testing dark energy with gravitational wave data.