Temperature Fluctuations of the Microwave Background in Primeval Isocurvature Baryon Models

• Published in: Symposium - International Astronomical Union
• Main Authors: Dutta, S. N., Efstathiou, G.
• Format: Article in Journal/Newspaper
• Language: English
• Published: Cambridge University Press (CUP) 1996
• Subjects: South Pole; South pole
• Online Access: http://dx.doi.org/10.1017/s0074180900110320; https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0074180900110320

We calculate the temperature fluctuations in the microwave background in open primeval isocurvature baryon models (Peebles, 1987) with cosmological densities in the range 0.05 ≤ ω ≤ 0.2 We assume that the power spectrum of fluctuations is a power law with the index varying between – 1 ≤ n ≤ 0, as indicated by observations of large scale structure in the Universe. The Universe is assumed to be always fully ionized. The South Pole 13 field point experiment (Schuster et al. , 1993) is compared to our theoretical predictions, and we find that the models predict larger temperature fluctuations than are observed. The observed temperature fluctuations on intermediate scales of ≲ 1 ° thus seem difficult to reconcile with the isocurvature baryon model.