scholarly journals Self-energy method for time-dependent spectral functions of the Anderson impurity model within the time-dependent numerical renormalization group approach

2021 ◽  
Vol 104 (20) ◽  
Author(s):  
H. T. M. Nghiem ◽  
T. A. Costi
Keyword(s):  
Renormalization Group ◽  
Energy Method ◽  
Time Dependent ◽  
Spectral Functions ◽  
Group Approach ◽  
Numerical Renormalization Group ◽  
Self Energy ◽  
Impurity Model ◽  
Anderson Impurity Model ◽  
Renormalization Group Approach

scholarly journals Renormalization Group Approach to Pandemics as a Time-Dependent SIR Model

2021 ◽  
Vol 8 ◽  
Author(s):  
Michele Della Morte ◽  
Francesco Sannino
Keyword(s):  
Renormalization Group ◽  
Time Dependence ◽  
Recovery Rate ◽  
Sir Model ◽  
Time Dependent ◽  
Cumulative Number ◽  
Group Approach ◽  
Renormalization Group Approach

We generalise the epidemic Renormalization Group framework while connecting it to a SIR model with time-dependent coefficients. We then confront the model with COVID-19 in Denmark, Germany, Italy and France and show that the approach works rather well in reproducing the data. We also show that a better understanding of the time dependence of the recovery rate would require extending the model to take into account the number of deaths whenever these are over 15% of the cumulative number of infected cases.

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