PIRSA:21060030

Detecting scalar field with extreme mass ratio inspirals

Franchini, N. (2021). Detecting scalar field with extreme mass ratio inspirals. Perimeter Institute. https://pirsa.org/21060030

Franchini, Nicola. Detecting scalar field with extreme mass ratio inspirals. Perimeter Institute, Jun. 08, 2021, https://pirsa.org/21060030 

          @misc{ pirsa_PIRSA:21060030,
            doi = {10.48660/21060030},
            url = {https://pirsa.org/21060030},
            author = {Franchini, Nicola},
            keywords = {Other},
            language = {en},
            title = {Detecting scalar field with extreme mass ratio inspirals},
            publisher = {Perimeter Institute},
            year = {2021},
            month = {jun},
            note = {PIRSA:21060030 see, \url{https://pirsa.org}}
          }

Nicola Franchini

SISSA International School for Advanced Studies

Talk number
PIRSA:21060030
Collection
Talk Type
Subject
Abstract
I will present extreme mass ratio inspirals (EMRIs), during which a small body spirals into a supermassive black hole, in gravity theories with additional scalar fields. No-hair theorems and properties of known theories that manage to circumvent them introduce a drastic simplification to the problem: the effects of the scalar on supermassive black holes, if any, are mostly negligible for EMRIs in vast classes of theories. I will show how to exploit this simplification to model the inspiral perturbatively and demonstrate that the scalar charge of the small body leaves a significant imprint on gravitational wave emission. This result is particularly appealing, as this imprint is observable with LISA, rendering EMRIs promising probes of scalar fields.