2 papers
astro-ph.CO2025
Testing the cosmic distance duality relation using model-independent approach
Shubham Barua, Sujit K. Dalui, Rikiya Okazaki +1
In this work, we test the cosmic distance duality relation (CDDR) using the arbitrary redshift pivot Padé-(2,1) expansion methodology developed in arXiv:2509.16196. This approach…
astro-ph.HE2025
A test of Amati relation using HII galaxy distances
Rikiya Okazaki, Shantanu Desai
We use model-independent luminosity distances of 186 HII galaxy observations to address the circularity problem in the Amati relation for Gamma-ray Bursts (GRBs). For this purpose,…