3 papers
astro-ph.HE2026
Gravitational-Wave Sky Mapping with Pulsar Timing Arrays: The Full Earth-Pulsar Response and Fundamental Resolution Limits
S. A. Andrianov, S. M. Kopeikin
Pulsar timing arrays (PTAs) are the only means to observe nanohertz gravitational waves (GWs). While current analyses primarily exploit the Earth term, the full detector response e…
gr-qc2025
Local coordinates and motion of a test particle in the McVittie spacetime
Vishal Jayswal, Sergei M. Kopeikin
We consider the orbital motion of a test particle in the gravitational field of a massive body (that might be a black hole) with mass placed on the expanding cosmological manif…
gr-qc2024
Lunar Time in General Relativity
Sergei M. Kopeikin, George H. Kaplan
We introduce the general-relativistic definition of Lunar Coordinate Time (TCL) based on the IAU 2000 resolutions that provide a framework for relativistic reference systems. From…