1 research outputs found
Dark age consistency in the 21cm global signal
We propose a new observable for the 21cm global signal during the dark ages,
the dark-age consistency ratio, which is motivated from the fact that the shape
of the functional form of the brightness temperature against the frequency is
cosmological-parameter independent in the standard CDM model. The
dark-age consistency ratio takes a certain definite value in the CDM
case, which can serve as a critical test of the model and probe those beyond
the standard one. The new observable just needs measurements of the brightness
temperature at a few frequency bands during the dark ages, and thus it allows
us to test cosmological scenarios even with limited information on the global
signal.Comment: 6 pages, 4 figure