2025/04/23 by C. Mallary, Mallary, C.
Earth and Planetary Sciences · Physics and Astronomy · #Cosmology and Gravitation Theories #FOS: Physical sciences #General Relativity and Quantum Cosmology (gr-qc) #Geophysics and Gravity Measurements #Radio Astronomy Observations and Technology
paper · pdf · doi:10.48550/arxiv.2504.16396
openalex publication_date 2025/04/23 · openalex created_date 2025/10/11 · openalex updated_date 2026/07/28
In general relativity, the tangential speed of objects in stable circular orbits is not uniquely described by the orbital radius and the mass present inside the orbital radius. This work presents a static, spherically symmetric spacetime metric which produces stable circular orbits whose speed approaches a constant value at high radii. The orbital speed is independent of the mass contained within the orbital radius, however, there is pressure throughout the spacetime. The stress energy tensor of this metric is evaluated numerically using the mass of the Milky Way's central black hole, the orbital speed of its distant satellites, and three different values of a unitless 'mass tuning' parameter B. These B 'tune' the amount of mass present, without violating the Weak Energy Condition (WEC) at any evaluated spacetime point. The metric can be merged with a Friedmann-Robertson-Walker metric, in which case it achieves isotropy and obeys the Friedmann equations at cosmological distances.