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10 research outcomes, page 1 of 1
  • publication . Preprint . Article . 2016
    Open Access English
    Authors:
    Peter Melchior; Erin S. Sheldon; Alex Drlica-Wagner; Eli S. Rykoff; T. M. C. Abbott; F. B. Abdalla; Sahar S. Allam; A. Benoit-Lévy; David Brooks; E. Buckley-Geer; ...
    Persistent Identifiers
    Publisher: HAL CCSD
    Countries: United Kingdom, United Kingdom, France
    Project: EC | COGS (240672), EC | TESTDE (291329), EC | COSMICDAWN (306478), NSF | Collaborative Research: T... (1138766), NSF | Programs on Critical Prob... (1066293)

    We have developed a crowdsourcing web application for image quality control employed by the Dark Energy Survey. Dubbed the "DES exposure checker", it renders science-grade images directly to a web browser and allows users to mark problematic features from a set of prede...

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  • publication . Preprint . Article . 2016
    Open Access English
    Authors:
    Braden, Jonathan; Johnson, Matthew C.; Peiris, Hiranya V.; Aguirre, Anthony;
    Persistent Identifiers
    Project: NSERC , EC | COSMICDAWN (306478), NSF | Programs on Critical Prob... (1066293)

    Cosmic inflation, a period of accelerated expansion in the early universe, can give rise to large amplitude ultra-large scale inhomogeneities on distance scales comparable to or larger than the observable universe. The cosmic microwave background (CMB) anisotropy on the...

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  • publication . Preprint . Article . 2016
    Open Access
    Authors:
    Boris Leistedt; Hiranya V. Peiris; F. Elsner; A. Benoit-Lévy; Adam Amara; A. H. Bauer; Matthew R. Becker; C. Bonnett; Claudio Bruderer; Michael T. Busha; ...
    Country: United Kingdom
    Project: EC | TESTDE (291329), NSF | Collaborative Research: T... (1138766), EC | COSMICDAWN (306478), EC | COGS (240672), NSF | Programs on Critical Prob... (1066293)

    Spatially-varying depth and characteristics of observing conditions, such as seeing, airmass, or sky background, are major sources of systematic uncertainties in modern galaxy survey analyses, in particular in deep multi-epoch surveys. We present a framework to extract ...

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  • publication . Article . Preprint . 2014
    Open Access English
    Authors:
    Layne C. Price; Hiranya V. Peiris; Jonathan Frazer; Richard Easther;
    Persistent Identifiers
    Project: NSF | Programs on Critical Prob... (1066293), EC | COSMICDAWN (306478)

    We study the tensor spectral index $n_t$ and the tensor-to-scalar ratio $r$ in the simplest multifield extension to single-field, slow-roll inflation models. We show that multifield models with potentials $V \sim \sum_i \lambda_i |\phi_i|^p$ have different predictions f...

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  • publication . Article . Preprint . 2016
    Open Access English
    Authors:
    Robert L. Schuhmann; Benjamin Joachimi; Hiranya V. Peiris;
    Persistent Identifiers
    Project: NSF | Programs on Critical Prob... (1066293), EC | COSMICDAWN (306478)

    We present a method to transform multivariate unimodal non-Gaussian posterior probability densities into approximately Gaussian ones via non-linear mappings, such as Box--Cox transformations and generalisations thereof. This permits an analytical reconstruction of the p...

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  • publication . Preprint . Article . 2015
    Open Access English
    Authors:
    Paul M. Sutter; Benjamin D. Wandelt; Franz Elsner;
    Persistent Identifiers
    Publisher: HAL CCSD
    Country: France
    Project: NSF | Collaborative Research: S... (0908902), EC | COSMICDAWN (306478), NSF | Programs on Critical Prob... (1066293), ANR | SUPER (ANR-11-IDEX-0004)

    We present a general method for accelerating by more than an order of magnitude the convolution of pixelated functions on the sphere with a radially-symmetric kernel. Our method splits the kernel into a compact real-space component and a compact spherical harmonic space...

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  • publication . Article . Preprint . 2018
    Open Access English
    Authors:
    Jonathan Braden; Matthew C. Johnson; Hiranya V. Peiris; Silke Weinfurtner;
    Persistent Identifiers
    Publisher: Springer Verlag
    Country: United Kingdom
    Project: NSF | Programs on Critical Prob... (1066293), EC | COSMICDAWN (306478)

    Analog condensed matter systems present an exciting opportunity to simulate early Universe models in table-top experiments. We consider a recent proposal for an analog condensed matter experiment to simulate the relativistic quantum decay of the false vacuum. In the pro...

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  • publication . Article . Preprint . 2015
    Open Access English
    Authors:
    Layne C. Price; Jonathan Frazer; Jiajun Xu; Hiranya V. Peiris; Richard Easther;
    Persistent Identifiers
    Project: NSF | Programs on Critical Prob... (1066293), EC | COSMICDAWN (306478)

    We present MultiModeCode, a Fortran 95/2000 package for the numerical exploration of multifield inflation models. This program facilitates efficient Monte Carlo sampling of prior probabilities for inflationary model parameters and initial conditions and is the first pub...

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  • publication . Article . Preprint . 2016
    Open Access English
    Authors:
    Matthew C. Johnson; Carroll L. Wainwright; Anthony Aguirre; Hiranya V. Peiris;
    Persistent Identifiers
    Project: EC | COSMICDAWN (306478), NSF | Programs on Critical Prob... (1066293)

    This is the third paper in a series establishing a quantitative relation between inflationary scalar field potential landscapes and the relic perturbations left by the collision between bubbles produced during eternal inflation. We introduce a new method for computing c...

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  • publication . Article . Preprint . 2016
    Open Access English
    Authors:
    Price, Layne C.; Peiris, Hiranya V.; Frazer, Jonathan; Easther, Richard;
    Country: Germany
    Project: EC | STRINGFLATION (647995), EC | COSMICDAWN (306478), NSF | Programs on Critical Prob... (1066293)

    Even simple inflationary scenarios have many free parameters. Beyond the variables appearing in the inflationary action, these include dynamical initial conditions, the number of fields, and couplings to other sectors. These quantities are often ignored but cosmological...

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10 research outcomes, page 1 of 1