Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Efficiency of Covid-19 Mobile Contact Tracing Containment by Measuring
  Time Dependent Doubling Time   The Covid-19 epidemic of the novel coronavirus (severe acute respiratory
syndrome SARS - CoV-2) has been spreading around the world. While different
containment policies using non-pharmaceutical interventions have been applied,
their efficiency are not known quantitatively. We show that the doubling time
Td(t) with the success s factor, the characteristic time of the exponential
growth of Td(t) in the arrested regime, is a reliable tool for early
predictions of epidemic spread time evolution and it provides a quantitative
measure of the success of different containment measures. The efficiency of the
containment policy Lockdown case Finding mobile Tracing (LFT) using mandatory
mobile contact tracing is much higher than the Lockdown Stop and Go (LSG)
policy proposed by the Imperial College team in London. A very low s factor was
reached by LFT policy giving the shortest time width of the dome of positive
case curve and the lowest number of fatalities. The LFT policy has been able to
reduce by a factor 100 the number of fatalities in the first 100 days of the
Covid-19 epidemic, to reduce the time width of the Covid-19 pandemic dome by a
factor 2.5 and to rapidly stop new outbreaks avoiding the second wave

37
The categories of this paper are: supr-con
27
The categories of this paper are: comp-gas
23
The categories of this paper are: solv-int
22
The categories of this paper are: chao-dyn
9
The categories of this paper are: nlin
26
The categories of this paper are: bayes-an
11
The categories of this paper are: hep-lat
20
The categories of this paper are: acc-phys
19
The categories of this paper are: eess
13
The categories of this paper are: quant-ph
36
The categories of this paper are: cmp-lg
34
The categories of this paper are: chem-ph
17
The categories of this paper are: q-fin
21
The categories of this paper are: adap-org
6
The categories of this paper are: astro-ph
8
The categories of this paper are: hep-ex