Abstract
We investigate the possible existence of anomalous mass defects in the low mass region of stellar sequences of strange stars. We employ the nonperturbative equation of state derived in the framework of the field correlator method to describe the hydrostatic equilibrium of the strange matter. The large distance static potential and the gluon condensate are the main parameters of the model. We use the surface gravitational redshift measurements as a probe to determine the ratio at the center of strange stars. For and , we show that and the corresponding redshift are limiting values at the maximum mass of the highest mass stellar sequence. As a direct application of our study, we try to determine the values of and from astrophysical observations of the compact star 1E 1207.4-5209. Due to the uncertainties in the surface redshift determination, we made two attempts to obtain the model parameters. Our findings show that at 68% confidence, at 90% confidence and at 95% confidence in the first attempt; and at 71% confidence, at 94% confidence and at 94% confidence in the second attempt. These values of and are in reasonable agreement with the lattice and QCD sum rules calculations. As a consequence of the high values of and , the anomalous mass defects of 1E 1207.4-5209 are in the first attempt and in the second attempt.
8 More- Received 19 April 2021
- Accepted 25 July 2021
DOI:https://doi.org/10.1103/PhysRevD.104.043020
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