The authors build an anisotropic gravastar model whose pressure profile and cut-off make it interpolate between a Hayward regular black hole and a horizonless ultracompact star, then compute shadow images for two accretion disk models.
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Anisotropic gravastar as horizonless regular black hole spacetime and its images illuminated by thin accretion disk
The authors build an anisotropic gravastar model whose pressure profile and cut-off make it interpolate between a Hayward regular black hole and a horizonless ultracompact star, then compute shadow images for two accretion disk models.