| Name: | Vednarayan Iyer |
| Affiliation: | Indian Institute of Technology Indore |
| Conference ID : | ASI2023_428 |
| Title : | Improving the semi-numerical simulations for cosmic dawn 21-cm signal |
| Authors : | Author : Vednarayan Iyer
Co- Authors : Dr. Suman Majumdar, Dr. Abinash Kumar Shaw, Chandra Shekhar Murmu |
| Mode of Presentation: | Poster |
| Abstract Category : | General Relativity and Cosmology |
| Abstract : | Cosmic Dawn (CD) and Epoch of Reionization (EoR) have eluded the observations so far, but with the future Square Kilometer Array (SKA) this will no longer be the case. The 21-cm line, with low excitation energy and low optical depth, is the best candidate to probe this era. There are lots of astrophysical processes taking place in the IGM during this period which will be imprinted on the fluctuations of 21cm brightness temperature. To interpret these fluctuations, one needs an accurate model of the 21cm signal that can be used to constrain the CD-EoR parameters. The publicly available semi-numerical simulations lack the accuracy that will be needed for the interpretation of the upcoming high-resolution observations with the SKA. The objective of this project is to improve these simulations by understanding the approximations undertaken by them and then finding an efficient algorithm to incorporate all of the astrophysical processes without making the simulation computationally heavy. We have incorporated X-ray heating on top of the existing ReionYuga simulation framework and initial results show a computationally efficient way to model this process. We further conduct a statistical comparison of our approach with the other publicly available simulations. The end goal is to build a semi-numeric simulation that can be used to constrain the CD-EoR parameters by performing fourier domain (power spectrum, bispectrum) and real space (Largest cluster statistics, Minkowski functions) statistical analysis. |
