FY13 Cosmic Frontier Experimental Research Program – Lab Review Argonne National Laboratory Background Material Program Status & Plans
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- Selected Invited Presentations
- 10.A.5 Reconstruction of the Dark Energy Equation of State
- Publications
- 10.B.1 PDACS: Portal-based Data Analysis services for Cosmological Simulations
- 10.B.2 HACC Development
- 10.B.3 Synthetic Sky Catalogs
Publications
Selected Invited Presentations
10.A.5 Reconstruction of the Dark Energy Equation of StateA major aim of ongoing and upcoming cosmological surveys is to measure the dark energy equation of state w and its time dependence at high accuracy. Since w(z) is not directly accessible to measurement, powerful reconstruction methods are needed to extract it reliably from observations. In collaboration with researchers from UC Santa Cruz and Los Alamos National Laboratory a new reconstruction method for w(z) based on Gaussian process modeling has been developed. This method can capture nontrivial time-dependences in w(z) and, most importantly, it yields controlled and unbaised error estimates. This method was extended to include a diverse set of measurements: baryon acoustic oscillations, cosmic microwave background measurements, and supernova data [1]. Currently available data sets were analyzed and the resulting constraints on w(z)were presented, finding very good agreement with a cosmological constant, w=-1. In addition, the method’s power to capture nontrivial behavior of w(z) was explored by analyzing simulated data assuming high-quality observations from future surveys. It was found that in addition to the supernova data, the baryon acoustic oscillation measurements leads to remarkably good reconstruction results and that the combination of different high-quality probes allows us to reconstruct w(z) very reliably with small error bounds. Publications
10.B Proposed Research (FY14, 15, 16)10.B.1 PDACS: Portal-based Data Analysis services for Cosmological SimulationsThe main goal for the next year is to release a stable PDACS version to the community that is populated with a suite of simulations, provides robust analysis tools, and allows the users to add their own tools in a straightforward fashion. A first version of PDACS will be released initially to a set of “test users” outside of Argonne. For this purpose, we have set up an Advisory Council comprising of members from several universities (UC Berkeley, Carnegie Mellon, Michigan, Michigan State, Oklahoma, Yale) who have agreed to help test PDACS, provide feedback, and implement new analysis tools. Once the Advisory Council is satisfied with the first version, PDACS will be released to the community. In order to allow users to contribute tools to PDACS, it is important to set up a framework for testing analysis tools. This task will ultimately result in the completion of a PDACS “Tool Shed”; users who wish to contribute tools will wrap them and commit them to the tool shed. The core PDACS developerswill be able to test the tools and decide if they meet the required standards (i.e., obey the specified formats, be computationally robust). If so,the tools will become part of the main PDACS distribution. The tool shed capabilityalready exists in Galaxy but has not been exposed within PDACS so far. In addition, more tools and simulations will be added, both from Argonne researchers and publicly available software. After the initial deployment of PDACS at NERSC, we expect to have PDACS instances available at multiple institutions, but with a single web front-end that seamlessly handles federated identity and account management. As capabilities such as dynamically resourced clouds become available, PDACS will allow scientists to use these services with no extra overhead. 10.B.2 HACC DevelopmentThe HACC development over the next three years encompasses three major directions: (i) Extension of the in-situ analysis capabilities of HACC; (ii) improved efficiency for very high mass resolution simulations to resolve subhalos with large numbers of particles while simulating large cosmological volumes; (iii) adding hydrodynamic capabilities to HACC using particle-based methods. In addition, we will continue to explore the newest supercomputing architectures available; HACC has been chosen as one of the benchmark codes for the CORAL (Collaboration Oak Ridge Argonne Livermore) partnership that will result in acquisition of the first 100+PFlops systems to appear in the US. 10.B.3 Synthetic Sky CatalogsThe development of synthetic sky catalogs will proceed in multiple directions. The primary focus will be on SAM-related activities, initially to develop synthetic catalogs based on halo merger trees only, and validated against a set of observations, such as luminosity functions of the target galaxies. The validation process is itself a complex task, combining the calibration and joint interpretation of multiple observations, along with confronting the many-parameter SAM models (with about 20 parameters initially) to these datasets. This last step will be carried out using a combination of statistical optimization and emulation methods. In parallel with this effort, a sub-halo based merger tree extension of the current version of Galacticus will be employed to generate the next improvement in sky catalogs. On a shorter timescale, we will continue to build catalogs with HOD and SHAM models as these will be adequate for BOSS analyses, as well as the initial design work for DESI. Directory: hep hep -> Simulation of Cosmic Muons in the atlas tile Calorimeter hep -> Have high stiffness hep -> Minutes of the hep-scd board of supervisors meeting Download 390.84 Kb. Share with your friends:
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