Year: 2025
Type: article
Abstract: This work discusses the influence of galaxy mergers in the evolution of a parabolic Lemaître–Tolman–Bondi (LTB) cosmology with simultaneous big bang endowed with two consecutive single fractal galaxy distributions systems possessing fractal dimension D . Based on recent empirical findings, it is assumed that the resulting galaxy mass from mergers can be expressed by a redshift dependent decaying power law. The proposed cosmological model modifies the relativistic fractal number counts distribution by including a merger rate evolution that estimates the model’s radial density. Numerical solutions for the first order small-merger-rate approximation (SMRA) are found and the results show that a fractal galaxy distribution having $$D=1.5$$ D = 1.5 in the range $$0.1 0.1 < z < 1.0 , and $$D=0.5$$ D = 0.5 for $$1 1 < z < 6 , as suggested by recent empirical findings, the SMRA allows consistent description of the model for a merger rate power law exponent up to $$q=0.2$$ q = 0.2 considering a fractal galaxy distribution starting from the Local Group. Consistent values were also found up to $$q=2.5$$ q = 2.5 and $$z=7$$ z = 7 from a scale smaller than the Local Supercluster. These results show that galaxy mergers can be successfully incorporated into the dynamics of a parabolic LTB fractal cosmology.
Source: The European Physical Journal C
Institution: Universidade Federal do Rio de Janeiro
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: diamond
OpenAlex ID: W4409756054