Erlangen 2026 – scientific programme
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GR: Fachverband Gravitation, Relativistische Astrophysik und Kosmologie
GR 10: Poster
GR 10.9: Poster
Wednesday, March 18, 2026, 16:15–18:45, Redoutensaal
Bondi mass loss formula for axial symmetric systems in f(R)= R + λ R2 gravity — •Thomas Guillermo Albers Raviola — Universität Bremen, Bremen, Germany
In General Relativity, the Bondi-Sachs formalism is used to study gravitational waves as observed at future null-infinity. It introduces the concept of the Bondi mass, whose decrease is connected to the the news tensor through the famous Bondi mass loss formula. This work investigates the changes in the Bondi mass loss formula for axial symmetric systems in f(R)= R + λ R2 gravity, also known as the Starobinsky inflation model. We develop this result in the scalar-tensor representation as a foundation for later applying similar methods for more general scalar-tensor theories of gravity. A priori, it is expected that the addition of further degrees of freedom shall provide a measurable signature, that may manifests itself, for example, in gravitational waves observations. Also closely related to the Bondi-Sachs results is the BMS group, which plays an important role in the search for a quantum theory of gravity. As such, it is highly interesting to understand the modifications to the BMS group in theories of gravity beyond general relativity.
Keywords: Bondi mass loss; f(R) gravity; Scalar-tensor gravity; Starobinsky Model