Applications of energy-momentum square gravity
Name: SEYED HAMIDREZA FAZLOLLAHI
Publication date: 19/03/2026
Examining board:
Name |
Role |
|---|---|
| HERMANO ENDLICH SCHNEIDER VELTEN | Presidente |
| HOSSEIN SHOJAIE | Coorientador |
| INÈS SALAKO | Examinador Externo |
| SANTIAGO PEREZ-BERGLIAFA | Examinador Externo |
| THIAGO CARAMÊS | Examinador Externo |
Pages
Summary: Our current understanding of the Universe shows that only about 5% of it is made of ordinary matter, the stars, planets, and galaxies we can observe. The remaining ~95% is invisible and is usually described as dark matter and dark energy. Dark matter is thought to hold galaxies together through its gravitational influence, while dark energy is believed to drive the accelerated expansion of the Universe. However, despite decades of research, the true nature of these components is still unknown.
In my thesis, I explore an alternative idea: instead of introducing unknown substances to explain these observations, the effects attributed to the dark sector might arise from a modification of gravity itself.
The work focuses on a theoretical framework known as Energy–Momentum Squared Gravity, where gravity is extended by including additional terms related to the square of the energy and momentum of matter. These modifications change the gravitational equations and can lead to new behavior on cosmological scales.
Within this framework, I investigate whether the observed expansion history of the Universe and phenomena commonly attributed to dark matter and dark energy can be explained without introducing separate dark components. The model is also tested against cosmological observations to examine whether it is consistent with current data.
The broader goal of this research is to contribute to one of the biggest open questions in modern physics: understanding the true origin of the dark sector and the fundamental laws that govern the evolution of the Universe.
