Cosmological Redshift in FRW Metrics with Constant Spacetime Curvature

Abstract

Cosmological redshift z grows as the Universe expands and is conventionally viewed as a third form of redshift, beyond the more traditional Doppler and gravitational effects seen in other applications of general relativity. In this paper, we examine the origin of redshift in the Friedmann-Robertson-Walker metrics with constant spacetime curvature, and show that---at least for the static spacetimes---the interpretation of z as due to the "stretching" of space is coordinate dependent. Namely, we prove that redshift may also be calculated solely from the effects of kinematics and gravitational acceleration. This suggests that its dependence on the expansion factor is simply a manifestation of the high degree of symmetry in FRW, and ought not be viewed as evidence in support of the idea that space itself is expanding.

Accepted for publication in MNRAS

References in corpus (6)

• The Cosmic Horizon
• The kinematic origin of the cosmological redshift
• The Cosmological Spacetime
• A direct consequence of the expansion of space?
• Interpretation of the Cosmological Metric
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• Astronomical Redshifts and the Expansion of Space
• Expanding space, quasars and St. Augustine's fireworks
• Initial Energy of a Spatially Flat Universe -- a Hint of its Possible Origin
• Unified approach to redshift in cosmological /black hole spacetimes and synchronous frame
• Tantalizing New Physics from the Cosmic Purview
• A Cosmological basis for E=mc^2
• Beyond Schwarzschild: New Pulsating Coordinates for Spherically Symmetric Metrics