The gravitational waves emitted during the coalescence of binary black holes are an excellent probe to test behaviour strong gravity. In this paper, we propose a new called `merger-ringdown consistency test` that focuses on probing imprints dynamics in strong-gravity around black-holes plunge-merger and ringdown phase. Furthermore, present scheme allows us efficiently combine information across...

Abstract In cosmology, the fine-structure constant can affect whole ionization history. However, previous works confine themselves to recombination epoch and give various strong constraints on constant. this paper, we also take reionization into consideration do a consistency test of from From data combination Planck 2018, BAO data, SNIa samples, SFR density UV IR measurements, Q HII constraint...