Abstract: Quantifying the evidence for horizons and understanding the nature of the dark ultracompact objects that populate our Universe are some of the most pressing problems in gravitational physics. It has been realized that producing horizonless ultracompact objects require some modifications either to the matter fields that describe our object, or to the theory of gravity itself. In order to study this issue, I will address it in two ways. First, I will study the case of fuzzballs, an exotic compact object motivated by string theory. Here, I will discuss the main details about the fuzzball proposal and I will also show how we can use their features to distinguish between them and black holes. Lastly, I will discuss the case of anisotropic stars where I will show that these self-gravitating configurations of anisotropic fluids can be ultracompact and have some interesting phenomenology.
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Zoom Meeting ID: 852 8915 0495
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