The blackbody spectrum B ν (T) (Equation 2.86) falls exponentially at frequencies above the peak, but only as a power law at lower frequencies (solid curve in Figure 2.20). This was indeed measured with tremendous accuracy by the FIRAS experiment on NASA's COBE satellite. ... Data from COBE … Since then, the COBE (Cosmic Background Explorer) satellite has measured this background radiation and found it to precisely fit a perfect blackbody spectrum at a temperature of 2.73 K. This perfect blackbody radiation coming from everywhere is strong evidence that we understand the universe at least back to 500,000 years before the Big Bang. For example, if a Sun-like spectrum had a redshift of z = 1, it would be brightest in the infrared rather than at the yellow-green color associated with the peak of its blackbody spectrum, and the light intensity will be reduced in the filter by a factor of four, (1 + z) 2. This matches the theoretical blackbody curve so exactly that it is impossible to distinguish the data from the curve. COBE was launched November 18, 1989 and carried three instruments, a Far Infrared Absolute Spectrophotometer (FIRAS) to compare the spectrum of the cosmic microwave background radiation with a precise blackbody, a Differential Microwave Radiometer (DMR) to map the cosmic radiation precisely, and a Diffuse Infrared Background Experiment (DIRBE) to search for the cosmic … READ PAPER. According to the Big Bang theory, the frequency spectrum of the CMB should have this blackbody form. Kenneth S. Krane Modern Physics FIRAS - The cosmic microwave background (CMB) spectrum is that of a nearly perfect blackbody with a temperature of 2.725 +/- 0.002 K. This observation matches the predictions of the hot Big Bang theory extraordinarily well, and indicates that nearly all of the radiant energy of the Universe was released within the first year after the Big Bang. 12 Full PDFs related to this paper. The FIRAS data from COBE shows the spectrum of the cosmic microwave background. This uniform radiation, with a blackbody spectrum, is evidence of the leftover glow from the Big Bang: the cosmic microwave background. This process of multiple scattering produces what is called a “thermal” or “blackbody” spectrum of photons. If the Universe expands and cools without changing its entropy (i.e., adiabatically), something that starts off with a blackbody spectrum will remain a blackbody, even as it cools. Both … The CMB anisotropy was first discovered by COBE in 1992, though this had too coarse resolution to detect the acoustic peaks. Assuming a Winterberg model for space where the vacuum consists of a very stiff two-component superfluid made up of positive and negative mass planckions, Q theory is the hypothesis, that Planck charge, qpl, was created at the same time as Planck mass.
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