|
Résumé |
The asymptotic structure of spacetime with a vanishing cosmological constant is
central to discussing gravitational radiation and gravitational scattering. In
asymptotically flat spacetimes, the peeling property prescribes a decay rate for
the Weyl tensor as one approaches the null boundary. However, there are compelling
motivations for relaxing this peeling condition, leading to a polyhomogeneous
rather than polynomial expansion in Bondi gauge. In this talk, I will review these
motivations and explore the implications of introducing logarithmic terms into the
asymptotic expansion. I will discuss how these modifications affect the symmetry
structure of such spacetimes and the consequences on soft theorems. Furthermore, I
will present new logarithmic evolution equations and flux-balance laws, which
point to the existence of an infinite hierarchy of subleading logarithmic soft
graviton theorems. |
