Online Seminar “An Einstein-Legendre modified f(R) gravity theory”

Star-UBB Seminar Series:- An Einstein-Legendre modified f(R) gravity theory

The speaker will report on the investigation of a new formulation of f(R) gravity, dubbed Einstein-Legendre f(R) gravity, in which a Legendre transform is included as a dynamical term. This leads to a theory with second-order field equations that describes general relativity with a self-interacting scalar field, without requiring the introduction of conformal frames. The speaker and his team find that the quadratic version of scalarized f(R) gravity reduces to general relativity with a massive scalar field, and explore its implications for Friedmann cosmology. They also explore alternative cases that illustrate the features of this modified f(R) gravity, and classify the possible asymptotic regimes. Their findings suggest this scalarized f(R) gravity may lead to simplified description of cosmological applications. The proposed formulation could offer a new perspective on the relationship between f(R) gravity and scalar–tensor theories. [Based on the ref: Eur.Phys.J.C 83 (2023) 433 • e-Print: 2305.04011 [gr-qc]]

時間:2024.06.27(四) 16:00~17:30
頻道:Zoom ID:853-7454-4159 ←
講者:Prof. José Pedro Mimoso (Departamento de Física, Faculdade de Ciencias, Universidade de Lisboa*, Campo Grande, Lisboa, Portugal)


*Department of Physics, Faculty of Science, Lisboa University

Scientific and Technological Advanced Research- Babeș-Bolyai University(Star-UBB) Seminar Series in Gravitation, Cosmology and Astrophysics

Presently a period of rapid and intense change are being witnessed in our understanding of the gravitational force, at a rate that is quickly increasing since the important observational discoveries of the late 1990s. With the advent of new observational techniques, the emergence of important cosmological and astrophysical paradigms can be seen that lead to a deep change in our understanding of the Universe. Astronomical observations strongly suggest that at large scales the force of gravity may not behave according to standard general relativity, and that a generalization of the gravitational action, either at the geometric level, or at the matter level, may be required for a full understanding of the gravitational interaction.

The goal of the present seminar is to bring Theoretical Gravitational Physics closer to the observations and experiments, and to discuss current topics in general relativity, high-energy physics, astrophysics and cosmology.


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