English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

In this work the worldline quantum field theory (WQFT) approach to computingobservables of the classical general relativistic two-body system is presented.Compact bodies such as black holes or neutron stars are described in aneffective field theory by worldline fields with spin degrees of freedomefficiently described by anti-commuting Grassmann variables. Novel results ofthe WQFT include the gravitational bremsstrahlung at second post-Minkowskianorder and the impulse and spin kick at third post-Minkowskian order all atquadratic order in spins.  Next, the WQFT is presented with a comprehensive discussion of its in-inSchwinger-Keldysh formulation, its Feynman rules and graph generation and itson-shell one-point functions which are directly related to the scatteringobservables of unbound motion. Here, we present the second post-Minkowskianquadratic-in-spin contributions to its free energy from which the impulse andspin kick may be derived to the corresponding order.  The computation of scattering observables requires the evaluation ofmulti-loop integrals and for the computation of observables at the thirdpost-Minkowskian order we analyze the required two-loop integrals. Ourdiscussion uses retarded propagators which impose causal boundary conditions ofthe observables.  Finally we turn to results of the WQFT starting with the gravitationalbremsstrahlung of the scattering of two spinning bodies. This waveform isdiscussed together with its radiative information of linear and angularmomentum fluxes.  Lastly we present the conservative and radiative impulse and spin kick atthird post-Minkowskian order and quadratic order in spins together with the aconservative Hamiltonian at the corresponding perturbative order. The resultsobey a generalized Bini-Damour radiation-reaction relation and theirconservative parts can be parametrized in terms of a single scalar.

Gravitational Scattering of Compact Bodies from Worldline Quantum Field Theory