2026-06-08T09:32:30Zhttps://docta.ucm.es/rest/oai/request
oai:docta.ucm.es:20.500.14352/720522024-09-05T14:00:05Zcom_20.500.14352_14col_20.500.14352_15
Docta Complutense author Guerrero Román, Mercedes author Olmo Gonzalo, J. author Rubiera García, Diego author Sáez Chillón Gómez, Diego 2023-06-22T11:03:18Z 2023-06-22T11:03:18Z 2022-08-30 2470-0010 10.1103/PhysRevD.106.044070 https://hdl.handle.net/20.500.14352/72052 http://dx.doi.org/10.1103/PhysRevD.106.044070 https://journals.aps.org/ We discuss the importance of multiring images in the optical appearance of a horizonless spherically symmetric compact object, when illuminated by an optically thin accretion disk. Such an object corresponds to a subcase of an analytically tractable extension of the Kerr solution dubbed as the "eye of the storm" by Simpson and Visser in [J. Cosmol. Astropart. Phys. 03 (2022) 011], which merits in removing curvature singularities via an asymptotically Minkowski core, while harboring both a critical curve and an infinite potential barrier at the center for null geodesics. This multiring structure is induced by light rays winding several times around the object, and whose luminosity is significantly boosted as compared to the Schwarzschild solution by the modified shape of the potential. Using three toy profiles for the emission of an infinitely thin disk, truncated at its inner edge (taking its maximum value there) and having different decays with the distance, we discuss the image created by up to eight rings superimposed on top of the direct emission of the disk as its edge is moved closer to the center of the object. Our results point to the existence of multiring images with a non-negligible luminosity in shadow observations when one allows for the existence of other compact objects in the cosmic zoo beyond the Schwarzschild solution. Such multiring images could be detectable within the future projects on very long baseline interferometry. eng Multiring images of thin accretion disk of a regular naked compact object. journal article URL https://docta.ucm.es/bitstreams/14d3e14e-d479-48c9-85ee-75b4ae62f8b9/download File MD5 d86af71c0574dbfb84074f95f6b2aa5c 4767101 application/pdf Rubiera, D 33 libre.pdf