PIRSA:21060030 Conference Other

DOI10.48660/21060030

Conference/School: The 24th Capra meeting on Radiation Reaction in General Relativity

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}}
}

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.

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