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7 research outcomes, page 1 of 1
  • publication . Article . Preprint . 2013
    Open Access
    Authors:
    Hiranya V. Peiris; Richard Easther; Raphael Flauger;
    Persistent Identifiers
    Publisher: IOP Publishing
    Project: NSF | Probing Fundamental Physi... (0855425), EC | COSMICDAWN (306478), NSF | CAREER: Strings on the Ho... (0645435)

    We use cosmic microwave background (CMB) data from the 9-year WMAP release to derive constraints on monodromy inflation, which is characterized by a linear inflaton potential with a periodic modulation. We identify two possible periodic modulations that significantly im...

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  • publication . Article . Preprint . 2018
    Open Access English
    Authors:
    Keir K. Rogers; Hiranya V. Peiris; Andrew Pontzen; Simeon Bird; Licia Verde; Andreu Font-Ribera;
    Persistent Identifiers
    Project: EC | COSMICDAWN (306478), UKRI | UCL Astrophysics Consolid... (ST/R000476/1), EC | BePreSysE (725327), NSF | New Cosmological Constrai... (1817256)

    The Lyman-alpha forest provides strong constraints on both cosmological parameters and intergalactic medium astrophysics, which are forecast to improve further with the next generation of surveys including eBOSS and DESI. As is generic in cosmological inference, extract...

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  • publication . Preprint . Article . 2014
    Open Access English
    Authors:
    Wainwright, Carroll L.; Johnson, Matthew C.; Peiris, Hiranya V.; Aguirre, Anthony; Lehner, Luis; Liebling, Steven L.;
    Persistent Identifiers
    Country: Italy
    Project: NSF | Collaborative Research: L... (1308621), EC | COSMICDAWN (306478), NSERC , NSF | Collaborative Research: D... (0969827)

    The theory of eternal inflation in an inflaton potential with multiple vacua predicts that our universe is one of many bubble universes nucleating and growing inside an ever-expanding false vacuum. The collision of our bubble with another could provide an important obse...

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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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7 research outcomes, page 1 of 1