Experimental estimation of Asymmetry of Radiation for Wheeler-Feynman theory for gravitational waves

Wheeler-Feynman absorber theory assumes there should be both retarded EM waves but also advanced, however, with symmetric 1/2-1/2 contributions. In contrast, observed Asymmetry of Radiation like inspiraling has lead to currently default assumption of 1-0 only retarded. Any convex combination is allowed, its choice should depend on the boundary conditions like imbalance between absorbers and emitters - while we have domination of absorbers, it does not need to be complete, suggesting to estimate emitters/absorbers asymmetry parameter from data. It could lead to confirmation of current assumption, or requirement to also include advanced waves into considerations. Experimental estimation of such Asymmetry of Radiation is currently difficult for EM waves due to asymmetry between receivers and transmitters. However, e.g. LIGO just measures lengths, which are invariant to T/CPT symmetry, making available gravitational wave observations appropriate for such estimation. We also discuss other arguments for nonzero contributions of advanced waves. For example gravitational observation of e.g. neutron star merger, with required but clearly missing (retarded) EM counterpart, would leave possibility of being advanced wave. Also there are observed events happening too early according to current knowledge e.g. mergers of black holes in the Mass Gap, or insufficient number of retarded sources e.g. for vibrations of the Universe observed by Pulsar Timing Arrays.

Source: arXiv:2512.20692v1 - http://arxiv.org/abs/2512.20692v1 PDF: https://arxiv.org/pdf/2512.20692v1 Original Link: http://arxiv.org/abs/2512.20692v1