Complexity growth in a holographic QCD model

In this study,we utilize the complexity-action duality to study the evolution of complexity in a holographic QCD model at finite temperature and chemical potential.By inserting a fundamental string as a probe,we investigated the properties of complexity growth in this Einstein-Maxwell-scalar gravity system,which is affected by the string velocity,chemical potential,and temperature.Our results show that the complexity growth is maximized when the probe string is stationary,and it decreases as the velocity of the string increases.When the string approaches relativistic velocities,the complexity growth always increases monotonically with respect to the chemical potential.Furthermore,we find that the complexity growth can be used to identify phase transitions and crossovers in the model.

An Empirical Study of Risk Factors of the Gaming Industry in Macao

Beyond doubt, the gaming industry is the most important to the sustained success for Macao. While the industry has been growing spectacularly well since its liberalization in 2004, now, it is time to critically review the risk factors that may adversely affect its long-term, healthy, and harmonious development. People and organizations need to be vigilant in peace time. Being able to think of possible crises while living in a safe environment has been our traditional wisdom. There is an obvious need to develop and maintain a risk management mechanism for the gaming industry in Macao. Appropriate precautionary measures developed through rigorous study can help mitigate the damage brought by crises and in turn will ensure the sustained development of Macao. Risks and crises, if handled properly, can possibly be transformed into opportunities. This research adopts an integrative approach through systematic and comprehensive investigation to establish an approach to monitor and predict risks and crises for the gaming industry in Macao. This would provide a useful reference for the society and government of Macao in handling them.

Tsallis holographic dark energy under complex form of quintessence model

In this paper,we use a Tsallis holographic dark energy model in two forms,interacting and noninteracting cases,to acquire some parameters as the equation of state for the energy density of the Tsallis model in the FRW Universe concerning the complex form of quintessence model.We will study the cosmology of complex quintessence by revamping the potential and investigating the scalar field dynamics.Then we analyze(w-w’)and stability in two cases,i.e.noninteracting and interacting.We will explore whether these cases describe a real Universe by calculating fractional energy densityΩ_(D)and concerning two parts of the quintessence field effect(complex and real part)by considering the real part of this field to be a slow-roll field.We know that the part in which the fractional energy density(Ω_(D)>1)does not describe a real Universe.Also,we specified an interacting coupling parameter b2that depends on the constant parameter of the Tsallis holographic model(δ)with respect to fractional energy density(0.73).Unlike independence between the fractional energy density and interacting coupling in the real quintessence model,we determine a relationship among these parameters in this theory.Finally,by plotting some figures,we specify the features of(w-w’)and(ν^(2)_(s))in two cases and compare the result with each other.

Holographic models of the scalar sector of QCD

We investigate the AdS/QCD duality for the two-point correlation functions of the lowest dimension scalar meson and scalar glueball operators,in the case of the Soft Wall holographic model of QCD.Masses and decay constants as well as gluon condensates are compared to their QCD estimates.In particular,the role of the boundary conditions for the bulk-to-boundary propagators is emphasized.

Two-gluon and trigluon glueballs from dynamical holography QCD

We study the scalar, vector and tensor two-gluon and trigluon glueball spectra in the framework of the 5-dimension dynamical holographic QCD model, where the metric structure is deformed self-consistently by the dilaton field. For comparison, the glueball spectra are also calculated in the hard-wall and soft-wall holographic QCD models. In order to distinguish glueballs with even and odd parities, we introduce a positive and negative coupling between the dilaton field and glueballs, and for higher spin glueballs, we introduce a deformed 5-dimension mass. With this set-up, there is only one free parameter from the quadratic dilaton profile in the dynamical holographic QCD model, which is fixed by the scalar glueball spectra. It is found that the two-gluon glueball spectra produced in the dynamical holographic QCD model are in good agreement with lattice data. Among six trigluon glueballs, the produced masses for 1±- and 2-- are in good agreement with lattice data, and the produced masses for 0--, 0＋- and 2＋- are around 1.5 GeV lighter than lattice results. This result might indicate that the three trigluon glueballs of 0--, 0＋- and 2＋- are dominated by the three-gluon condensate contribution.