Dear Colleagues,

The accumulation of large amounts of data by the most varied observations in recent years has brought new challenges to modern cosmology. These challenges include i) the tension in the measurements of the Hubble constant (H₀) and the amplitude of late-time matter fluctuations (S₈); ii) challenges in cosmology with gravitational waves; iii) the best modeling of the universe at early and late times, including the nature of the dark species, that is, dark matter and dark energy; and iv) improvements and new techniques for parameter estimation. Accompanied by these advances, a plethora of new theories have been proposed in order to address unresolved issues.

This Special Issue aims to collect work with particular regard to (keywords):

-Observational cosmology.

-Proposals for a new physics or systematic effects behind the data in light of the H₀ and S₈ tensions.

-Dark matter, dark energy, and modified gravity models.

-Data analysis techniques and parameter estimation in cosmology and gravitational waves.

-Cosmology and fundamental physics with gravitational waves.

-Gravitational waves and the nature of compact objects (neutron stars, black holes, white dwarves, primordial black holes, and exotic compact objects).

Dr. Rafael Nunes
Guest Editor

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