| Name: | Sourav Das |
| Affiliation: | Inter-University Centre for Astronomy and Astrophysics |
| Conference ID: | ASI2025_637 |
| Title: | Etherington distance-duality relation using SN and BAO |
| Authors: | Sourav Das 1, Surhud More 1, 2 |
| Authors Affiliation: | 1 Inter-University Centre for Astronomy and Astrophysics, Post bag 4, Ganeshkhind, Pune 411007, India
2 Kavli Institute for the Physics and Mathematics of the Universe (WPI), 5-1-5 Kashiwanoha, 2778583, Japan |
| Mode of Presentation: | Poster |
| Abstract Category: | Galaxies and Cosmology |
| Abstract: | The Etherington distance-duality relation, relates the luminosity distance D_L and angular diameter distance D_A by redshift z such that D_L = D_A*(1+z)^2. This relation is derived purely under the assumptions of photon number conservation and a metric theory of gravity. In the absence of such non-standard mechanisms, the Etherington relation can be used to test for systematic errors in cosmological data. The luminosity distance D_L is obtained from Type-Ia supernovae, which serve as standardizable candles, while the angular diameter distance D_A is derived from Baryon Acoustic Oscillations (BAO). Recently the DESI collaboration has claimed a deviation of dark energy from a cosmological constant. In light of this, we present results on a test of the different Supernova and BAO data used in the DESI cosmological analyses. |
