A full colloquium talk presented at KASI.
We applied the extended Alcock-Paczynski test to the Sloan Digital Sky Survey data and measured the equation of state parameter of dark energy causing the accelerated expansion of the universe to be -0.903 ± 0.023 under the flat wCDM cosmological paradigm without combing our data with that from the cosmic microwave background anisotropy measurement. This value of w is 4.2 sigma away from -1, the value for the cosmological constant, falsifying the standard flat Lambda CDM model.
Reference
Fuyu Dong, Changbom Park, Sungwook E. Hong, Juhan Kim, Ho Seong Hwang, Hyunbae Park, and
Stephen Appleby, 2023, Tomographic Alcock-Paczyński Test with Redshift-space Correlation Function: Evidence for the Dark Energy Equation-of-state Parameter w greater than −1, Astrophysical J., 953, 98 (August 8, 2023)
arXiv:2305.00206 submitted on April 29, 2023
#darkenergy #cosmology #natureofdarkenergy #acceleratinguniverse