Quasinormal modes of astronomical black holes: Observational comparison and detectability using Kiselev solution

• Grant number: 25/07262-8
• Support Opportunities: Scholarships abroad - Research Internship - Scientific Initiation
• Start date: September 01, 2025
• End date: December 31, 2025
• Field of knowledge: Physical Sciences and Mathematics - Physics - General Physics
• Principal Investigator: Bertha María Cuadros Melgar
• Grantee: Diogo Gripa Rodrigues
• Supervisor: Cecilia Bertoni Martha Hadler Chirenti
• Host Institution: Escola de Engenharia de Lorena (EEL). Universidade de São Paulo (USP). Lorena , SP, Brazil
• Institution abroad: National Aeronautics and Space Administration, Greenbelt (NASA), United States
• Associated to the scholarship: 23/18117-3 - Geodesic motion around the rotating Kiselev black hole, BP.IC

Abstract

The recent detections of gravitational waves coming from mergers of compact binary systems have opened up a new window to observe the universe and have boosted blackhole physics in the last decade. The final stage after the binary merger is characterized by the quasinormal modes, whose frequency is a complex number determined by the parameters of the black hole merger remnant. In this project we aim to determine the contribution of an anisotropic fluid to the quasinormal frequencies and its detectability with Advanced LIGO. We use a Kiselev background geometry to describe the black hole + anisotropic fluid configuration, which can be considered a more realistic model of a black hole and its surroundings, and the LIGO noise curve at design sensitivity for estimating the signal-to-noise ratio of a fiducial detection. For a black hole mass consistent with recent detections, we expect to place an upper limit on the detectability of the anisotropic fluid contribution. (AU)