# HACC Cosmological Simulations: First Data Release

## TL;DR

This paper announces the first public data release from large cosmological simulations using the HACC code, providing extensive datasets and a user-friendly platform for researchers.

## Contribution

It introduces a comprehensive data release platform for HACC simulations, including diverse datasets and web-based access, facilitating broader scientific use.

## Key findings

- Released datasets include halo info, particles, and lightcone outputs.
- Data covers multiple redshifts and cosmologies, including LCDM and beyond.
- The platform enables efficient data access and will expand with additional data types.

## Abstract

We describe the first major public data release from cosmological simulations carried out with Argonne's HACC code. This initial release covers a range of datasets from large gravity-only simulations. The data products include halo information for multiple redshifts, down-sampled particles, and lightcone outputs. We provide data from two very large LCDM simulations as well as beyond-LCDM simulations spanning eleven w0-wa cosmologies. Our release platform uses Petrel, a research data service, located at the Argonne Leadership Computing Facility. Petrel offers fast data transfer mechanisms and authentication via Globus, enabling simple and efficient access to stored datasets. Easy browsing of the available data products is provided via a web portal that allows the user to navigate simulation products efficiently. The data hub will be extended by adding more types of data products and by enabling computational capabilities to allow direct interactions with simulation results.