We analyse the possibility that the dark matter candidate, the dilaton, emerges from the approximate conformal symmetry of the hidden scalar sector. The study includes the warm dark matter scenario and the Bose-Einstein condensation which may lead to massive Boson stars giving rise to detection through the observation of the primary (direct) photons. We study the fluctuations of the scalar particles density under the extreme conditions of phase transition. When the phase transition approaches, the fluctuation of the particle density will increase sharply. Our results suggest that the phase transition in the Boson stars may be identified through the fluctuation in yield of primary photons induced directly by the conformal anomaly. The fluctuation rate of these photons emitted by the hidden scalar particles has an intensive growth and becomes very large at the phase transition. The dynamics and the properties of the dilatons at the temperature and the chemical potential around their critical values may be the keys to understand the evolution of the Universe.