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Permanent URI for this communityhttps://hdl.handle.net/20.500.14288/2
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Publication Restricted Generalized theories of gravity and supergravity in three dimensions(Koç University, 2022) Yetişmişoğlu, Cem; Dereli, Tekin; 0000-0002-6244-6054; Koç University Graduate School of Sciences and Engineering; Physics; 201358Publication Open Access Gravitational Higgs mechanism and resulting observational effects(American Physical Society (APS), 2020) Krall, Verena; Kokkotas, Kostas D.; Department of Physics; Coates, Andrew; Researcher; Department of Physics; College of SciencesRecently, a toy model was introduced to demonstrate that screening mechanisms in alternative theories of gravitation can hide additional effects. In this model a scalar field is charged under a U(1) symmetry. In sufficiently compact objects the scalar field spontaneously grows, i.e., the object scalarizes, spontaneously breaking the U(1) symmetry. Exactly as in the U(1) Higgs mechanism this leads to the emergence of a mass for the gauge field. The aim of this paper is to provide an example of the physical consequences if we consider this toy model as a prototype of Weak Equivalence Principle (WEP) violations. We model neutron stars with a dipolar magnetic field to compare the magnetic field behavior of stars in Einstein-Maxwell theory on the one hand and in scalar-tensor theory with the, so-called, gravitational Higgs mechanism on the other hand.Publication Restricted Theory and observation of spontaneous scalarization(Koç University, 2022) Akram, Fathima Afra Mohamed; Ramazanoğlu, Fethi Mübin; 0000-0003-3075-1457; Koç University Graduate School of Sciences and Engineering; Physics; 254225