Cosmic Himalayas Reconciled with Lambda CDM
Published:Dec 31, 2025 16:52
•1 min read
•ArXiv
Analysis
This paper addresses the apparent tension between the observed extreme quasar overdensity, the 'Cosmic Himalayas,' and the standard Lambda CDM cosmological model. It uses the CROCODILE simulation to investigate quasar clustering, employing count-in-cells and nearest-neighbor distribution analyses. The key finding is that the significance of the overdensity is overestimated when using Gaussian statistics. By employing a more appropriate asymmetric generalized normal distribution, the authors demonstrate that the 'Cosmic Himalayas' are not an anomaly, but a natural outcome within the Lambda CDM framework.
Key Takeaways
- •The study challenges the initial high significance of the 'Cosmic Himalayas' quasar overdensity.
- •Non-Gaussian statistics are crucial for accurately assessing the rarity of extreme quasar overdensities.
- •The CROCODILE simulation supports the idea that the 'Cosmic Himalayas' are consistent with the Lambda CDM model.
Reference
“The paper concludes that the 'Cosmic Himalayas' are not an anomaly, but a natural outcome of structure formation in the Lambda CDM universe.”