Classical and Quantum Theory of Nonlinear Physical Fields and Structures

Project funded by Ministry of Science, Education and Youth of the Republic of Croatia (zProjects), grant 036-0982930-3144. Participating organisations named by the source: University of Zagreb, Faculty of Electrical Engineering and Computing; University of Zagreb; Fakultet elektrotehnike i računarstva. Runs 2007-01-01 to 2013-06-30. Source: OpenAIRE Graph, from the funder's project data (collected by OpenAIRE on 2026-07-23); national funding data, not CORDIS. Abstract given by the source: The basic starting point of this research is the fact that nonlinearities appear in physics as well as in other (natural) sciences at almost all levels of research. Here, two overlapping segments are investigated in which nonlinearities arise from the application of gravitational interaction theory (but also Abelian and non-Abelian Baždar theories) to the dynamics of matter in space, at the macroscopic and microscopic level. One segment refers to non-linear structures (neutral and charged - gravastar, dust, boson and neutron stars) as solutions of Einsteins general theory of relativity (OTR) and scalar-tensor theory (STT), and the second segment is focused on the structure of stars containing foreign quarks , and is based on the Standard Model. Three aspects of nonlinear structures will be studied: formation, static properties and decay. A prerequisite for both segments is the formulation of equations of state based on existing ones (baritropes, polytropes) as well as new ones dictated by the conditions of energy conservation, stability and assumptions of additional characteristics of nonlinear structures. In particular, anisotropy is highlighted as a common property of the segments. Rotational states will be investigated with appropriate metrics dictated by symmetry and dynamics properties (Kerr and Kerr-Newman metrics). A two-component anisotropic fluid model, neutral and charged components, will be considered. The creation of structures through gravitational collapse with different initial conditions and the appearance of singularities during the collapse will be investigated. Stability - radial and tangential - will be investigated, because it is anisotropic structures. This connects the two segments of this research. The second segment is focused on the research of neutron stars that are described by extreme densities and contain foreign matter (quarks as hyperons and foreign mesons). These are the so-called selfbound and foreign stars, which are solutions of [shortened; the full text is on the OpenAIRE page]

Original source.

Source: OpenAIRE Graph: projects of national funders, OpenAIRE, from the project data of Ministry of Science, Education and Youth of the Republic of Croatia. Retrieved 2026-10-28. Licence: Creative Commons Attribution 4.0 (OpenAIRE Graph). Selected metadata, adapted presentation; the publisher's record is authoritative. No endorsement by the source is implied. Licence: Creative Commons Attribution 4.0 (CC BY 4.0).

AI-assisted summary: The project "Classical and Quantum Theory of Nonlinear Physical Fields and Structures" was funded by the Ministry of Science, Education and Youth of Croatia from 2007 to 2013, involving the University of Zagreb. It investigates nonlinearities in physics related to gravitational interaction theory. Suggested technology pillar: enabling. Generated by AI from the public source text; it may contain errors and the original source is authoritative.