WMAP 5th yr data The locations and amplitudes of three acoustic peaks and two dips in the last re-leases of the Boomerang, MAXIMA and DASI measurements of the cosmic microwave background (CMB) anisotropy power spectra as well as their statistical con dence lev-els are determined in a model-independent way. V71 Cosmic Microwave Background Lesson 7 Acoustic Peaks ANU ASTRO4x Courseware edX - Duration: 13:03. Baryon acoustic oscillations acoustic peaks in cosmic microwave background anisotropies provides evidence for cold dark matter but is there any sort of prediction as to the specific properties of this dark matter? • The first peak used to be called the Doppler peak because it is where Doppler effects dominate. The sound speed results from the competition between restoring forces and inertia. When delta T/T is plotted against angular separations between points we see several peaks in the plot. predictions as to the mass of this dark matter, total mass, and mass of the individual particle, i.e 100 gev. Acoustic Peaks The above CMB maps are pretty, but what do they mean? 13:03. • The CMB is a snapshot of the acoustic motions of the gas when the pressure drops to zero. Problem: CMB acoustic peaks a) The scale of the acoustic peaks in the CMB power spectrum is set by the comoving distance that a sound wave could travel between the time when the perturbation was created (tˇ0) and the epoch of recombination (t= t). CMB calibration •Not coincidentally the sound horizon is extremely well determined by the structure of the acoustic peaks in the CMB. To answer that, we must consider in more detail what causes these fluctuations. Dominated by uncertainty in ρ m from poor constraints near 3rd peak in CMB spectrum. (Planck will nail this!) The locations and amplitudes of three acoustic peaks and two dips in the BOOMERANG, MAXIMA, and DASI measurements of the cosmic microwave background (CMB) anisotropy power spectra as well as their statistical confidence levels are determined in a model-independent way. It is shown that the Boomerang-2001 The temperature fluctuations in the CMB, especially the so-called acoustic peaks in the angular power spectrum of CMB anisotropies, capture the physics of primordial photon-baryon fluid undergoing oscillations in the potential wells of dark The Acoustic Peak Primer Daniel J. Eisenstein Steward Observatory, University of Arizona °c 2005 ... in the CMB? How can one explain existence of acoustic peaks in cosmic microwave background anisotropies? The Acoustic Peaks • Basically they are due to standing wave oscillations within the sound horizon. CMB: AT PRESENT The cosmic microwave background (CMB) is now a well known probe of the early universe. 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