Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Macroscopic crack propagation in brittle heterogeneous materials
  analyzed in Natural Time   Here, we analyze in natural time $\chi$, the slow propagation of a
macroscopic crack in brittle heterogeneous materials through sudden jumps and
energy release events which are power law distributed with universal exponents.
This macroscopic crack growth is currently believed to exhibit similar
characteristics with the seismicity associated with earthquakes. Considering
that the crack front is self affine and exhibits Family-Vicsek universal
scaling, we show that the variance $\kappa_1 (\equiv\langle \chi^2\rangle
-\langle \chi \rangle^2)$ of natural time is equal to 0.0686, which almost
coincides with the value $\kappa_1\approx 0.07$ obtained from the seismicity
preceding major earthquakes. This sheds light on the determination of the
occurrence time of an impending mainshock.

22
The categories of this paper are: chao-dyn
1
The categories of this paper are: cs
20
The categories of this paper are: acc-phys
16
The categories of this paper are: stat
37
The categories of this paper are: supr-con
25
The categories of this paper are: patt-sol
19
The categories of this paper are: eess
36
The categories of this paper are: cmp-lg
0
The categories of this paper are: hep-ph
7
The categories of this paper are: hep-th
24
The categories of this paper are: dg-ga
5
The categories of this paper are: gr-qc
34
The categories of this paper are: chem-ph
27
The categories of this paper are: comp-gas
33
The categories of this paper are: plasm-ph
29
The categories of this paper are: funct-an