Cosmic calibration: Constraints from the matter power spectrum and the cosmic microwave background

Journal Article · Mon Oct 15 00:00:00 EDT 2007 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.76.083503· OSTI ID:21032426

Habib, Salman ^[1]; Heitmann, Katrin ^[2]; Higdon, David; Williams, Brian ^[3]; Nakhleh, Charles ^[4]

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1. T-8, MS B285, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
2. ISR-1, MS D466, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
3. CCS-6, MS F600, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
4. X-2, MS T087, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)

Several cosmological measurements have attained significant levels of maturity and accuracy over the past decade. Continuing this trend, future observations promise measurements of the cosmic mass distribution at an accuracy level of 1% out to spatial scales with k{approx}10h Mpc{sup -1} and even smaller, entering highly nonlinear regimes of gravitational instability. In order to interpret these observations and extract useful cosmological information from them, such as the equation of state of dark energy, very costly high precision, multiphysics simulations must be performed. We have recently implemented a new statistical framework with the aim of obtaining accurate parameter constraints from combining observations with a limited number of simulations. The key idea is the replacement of the full simulator by a fast emulator with controlled error bounds. In this paper, we provide a detailed description of the methodology and extend the framework to include joint analysis of cosmic microwave background and large-scale structure measurements. Our framework is especially well suited for upcoming large-scale structure probes of dark energy such as baryon acoustic oscillations and, especially, weak lensing, where percent level accuracy on nonlinear scales is needed.

• OSTI ID: 21032426
• Journal Information: Physical Review. D, Particles Fields, Vol. 76, Issue 8; Other Information: DOI: 10.1103/PhysRevD.76.083503; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ACCURACY
BARYONS
COSMOLOGY
ENERGY SPECTRA
EQUATIONS OF STATE
GRAVITATIONAL INSTABILITY
MASS DISTRIBUTION
NONLINEAR PROBLEMS
NONLUMINOUS MATTER
RELICT RADIATION