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The document presents the derivation of the geodesic equations for null and timelike particles within the 3+1 formalism of general relativity, which includes an evolution equation for particle energy and a redshift factor for photons. It discusses the application of these equations in ray-tracing techniques to compute images and spectra in numerically generated spacetimes, particularly focusing on stationary and collapsing neutron stars. The article also introduces the GYOTO ray-tracing code, which utilizes
- Author
- Éter Entre Elos
- Language
- EN