Austrian Early Career Conference 2024

Contribution:
Poster

Authors:
J. Sanghavi

Affiliations:
Ludwig-Maximilians-Universität München

Title:
Relics from the Early Universe in Cosmic Voids

Abstract:
Unlike halos, cosmic voids are anti-correlated with the dark matter, and the large-scale void bias can be negative. Thus, this work explores the information contained in voids, which complements the analysis using halos, and investigates the potential of cosmic voids to test local primordial non-Gaussianity and cosmological parity violation.
By utilizing a suite of 150 full N-body Quijote simulations, we analyze the void bias which exhibits scale-dependent corrections, like its halo bias counterpart. To enhance the analysis, we implement a unique weighing scheme, giving weightage to under-dense voids through compensation. Furthermore, we compare our results between voids identified in the halo density field and those in the dark matter distribution.
We also analyze 450 N-body Quijote simulations, divided into sets with different parity-violating parameter values. Intriguing signatures are found in the angular momentum of voids, exhibiting a non-zero correlation with the average velocity of the void. These findings suggest the potential for using pseudoscalars and other directional correlators to evaluate parity violation.
By utilizing cosmic voids, we can deep dive into the earliest moments of the Universe. Future surveys sensitive to voids might be able to confirm our findings and further constrain various models.