CMB constraints on the thermal evolution with a decaying cosmological term

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We give new constraints on the cosmological evolution with a decaying cosmological term from the recent observations of temperature-redshift relations. In our study, the cosmological term is assumed to be a function of the scale factor that increases toward the early universe, and the photon temperature is different from that of the standard ΛCDM model. We can obtain the parameter region derived from the CMB temperature observation.

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