Relativity and Cosmology

    

Geometric Origin of the Cepheid Variables: Time Varying Light Cones

Authors: S. Panda, M. S. Modgil

Cepheid variable stars are among the most important standard candles in observational cosmology, exhibiting periodic variation in brightness. In this work, we propose a novel geometric model to explain their pulsation using a time-periodic spacetime with modulated causal structure. Specifically, we introduce a time-dependent metric coefficient $g_{tt}(t)$ driven by a brightness-inspired function that mimics asymmetric Planck-like emission. This leads to oscillating light cones, whose angles encode the gravitational basis for observed Cepheid variability, as a consequence of causal dynamics in the spacetime geometry.

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[v1] 2025-04-06 22:24:22

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