03615nam a22005415i 4500 978-3-031-48994-5 DE-He213 20251030110918.0 cr nn 008mamaa 240110s2024 sz | s |||| 0|eng d 9783031489945 978-3-031-48994-5 10.1007/978-3-031-48994-5 doi QC173.6 PHR bicssc SCI061000 bisacsh PHR thema Silvervalle, Samuele. author. aut http://id.loc.gov/vocabulary/relators/aut 69405 Isolated Objects in Quadratic Gravity [electronic resource] : From Action Principles to Observations / by Samuele Silvervalle. 1st ed. 2024. Cham : Springer Nature Switzerland : Imprint: Springer, 2024. XIII, 192 p. 71 illus., 40 illus. in color. online resource. text txt rdacontent computer c rdamedia online resource cr rdacarrier text file PDF rda Springer Theses, Recognizing Outstanding Ph.D. Research, 2190-5061 Introduction -- Quadratic Gravity -- Analytical approximations and numerical methods -- The Phase Diagram of Quadratic Gravity -- Solutions of Quadratic Gravity -- Quasi-normal Modes and Stability of the Solutions. One of the main unanswered question of modern Physics is "How does gravity behave at small scales?". The aim of this thesis is to illustrate in a comprehensive but accessible way how to look for deviations from Einstein's theory of General Relativity in this regime, looking at the simplest celestial bodies: static and spherically symmetric ones. With a conservative and bottom-up approach, at smaller scales the first corrections to the action of General Relativity are generally considered to be terms quadratic in the curvature tensors; while these modifications do not cure the inconsistency between gravity and quantum mechanics, the solutions of this theory are plausible candidates to be the first-order corrections of the classical ones. Even with such simple modifications, a striking picture emerges from the study of isolated objects: the unique Schwarzschild solution of General Relativity is only a rare bird in the set of solutions, with non-Schwarzschild black holes, wormholes and naked singularities appearing as possible substitutes. Tailored to graduate students and researchers entering this field, this thesis shows how to construct these new solutions from action principles, how to characterize their metric, how to study their physical properties, such as their stability or Thermodynamics, and how to look for phenomenological signatures. General relativity (Physics). 69406 Gravitation. 69407 Mathematical physics. General Relativity. 69408 Classical and Quantum Gravity. 69409 Mathematical Physics. SpringerLink (Online service) Springer Nature eBook Printed edition: 9783031489938 Printed edition: 9783031489952 Printed edition: 9783031489969 Springer Theses, Recognizing Outstanding Ph.D. Research, 2190-5061 66370 https://doi.org/10.1007/978-3-031-48994-5 ZDB-2-PHA ZDB-2-SXP 57150 57150