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The dimensionless Hubble function h and the dimensionless density χ versus the dimensionless time η for large values the parameter˜sparameter˜ parameter˜s.

The dimensionless Hubble function h and the dimensionless density χ versus the dimensionless time η for large values the parameter˜sparameter˜ parameter˜s.

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Figure 1. The dimensionless Hubble function h and the dimensionless...
Figure 2. The same plot as in 1, but over a large timescale.
Figure 3. The same plot as in 1, but for large values of˜sof˜ of˜s.
Figure 4. The same plot as in 2 but form larger values of˜sof˜ of˜s.
+5 Figure 5. The dimensionless Hubble function h and the dimensionless...
Cosmologies in f(R,  m ) theory with non-minimal coupling between geometry and matter
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  • May 2024
Among the recent extensions to standard General Relativity, f ( R , L m ) gravity has risen an interest given the possibility of coupling between geometry and matter. We examine the simplest model with non-minimal coupling in the context of cosmology. We pay special attention to the question of how far this model could reproduce the observational f...
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... interpretes this as singularities. This is demonstrated in figure 5. In figure 6, we return to relative small values of˜sof˜ of˜s to show that the cusp behavior is quite common in the model. ...

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Among the recent extensions to standard General Relativity, $f(R,\mathcal{L}_m)$ gravity has risen an interest given the possibility of coupling between geometry and matter. We examine the simplest model with non-minimal coupling in the context of cosmology. We pay special attention to the question of how far this model could reproduce the observat...
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... Another equally important issue is the lifetime of the Universe, especially in comparison with the lifetimes of the oldest objects we observe. Simply put, the ages of old stars and galaxies cannot exceed the lifetime of the Universe (or comes too close to it), making this a powerful constraint [37]. ...
... The bounds on the lifetime of the Universe serves as a powerful tool for evaluating the validity of cosmological models [37], as the Universe cannot be younger than the objects it contains. Of particular relevance are the lower bounds on the Universe's age, especially when considering some of the oldest galaxies and stars detected in our observable Universe. ...
The Universe according to DESI results
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  • Sep 2024
The recent fit of cosmological parameters by the Dark Energy Spectroscopic Instrument (DESI) collaboration will have a significant impact on our understanding of the universe. Given its importance, we conduct several consistency checks and draw conclusions from the fit. Specifically, we focus on the following key issues relevant to cosmology: (i) the acceleration of the universe's expansion, which, according to the fit, differs over cosmological time compared to the standard cosmological model; (ii) the age of the universe, which appears slightly shorter than the age of the oldest stars; and (iii) the solution of the scale factor, both numerically and in an approximate analytical form.
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