Video URL

https://pirsa.org/24040109

Turning Back Time on Space

Nikakhtar, F. (2024). Turning Back Time on Space. Perimeter Institute for Theoretical Physics. https://pirsa.org/24040109

Nikakhtar, Farnik. Turning Back Time on Space. Perimeter Institute for Theoretical Physics, Apr. 23, 2024, https://pirsa.org/24040109 

          @misc{ scivideos_PIRSA:24040109,
            doi = {10.48660/24040109},
            url = {https://pirsa.org/24040109},
            author = {Nikakhtar, Farnik},
            keywords = {Cosmology},
            language = {en},
            title = {Turning Back Time on Space},
            publisher = {Perimeter Institute for Theoretical Physics},
            year = {2024},
            month = {apr},
            note = {PIRSA:24040109 see, \url{https://scivideos.org/index.php/pirsa/24040109}}
          }

Farnik Nikakhtar Yale University

DOI 10.48660/24040109
Source Repository PIRSA
Collection
Talk Type Scientific Series
Subject

Abstract

One big question in the physics of large-scale structures is how we can trace back the evolution of cosmic structures and reconstruct the initial density field. The universe we observe today is dotted with galaxy clusters separated by vast voids, in sharp contrast to its initial state, which was nearly uniform with only minor density fluctuations. The evolution from this early uniformity to today's complex structure of galaxies is a profound transformation, with many intermediate processes still unexplained. This talk focuses on this transformation, aiming to reconstruct both the initial density and the displacement fields of galaxies observed in spectroscopic surveys. I will discuss new reconstruction algorithms that depend weakly, if at all, on a cosmological model. These algorithms have paved the way for new astrophysical achievements in several directions, such as: Baryon Acoustic Oscillations (BAO) analysis, morphological analysis of proto-halos, and kinematic Sunyaev-Zel'dovich (kSZ) effect.

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