Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Elastic anomalies in glasses: the string theory understanding in the
  case of Glycerol and Silica   We present an implementation of the analytical string theory recently applied
to the description of glasses. These are modeled as continuum media with
embedded elastic string heterogeneities, randomly located and randomly
oriented, which oscillate around a straight equilibrium position with a
fundamental frequency depending on their length. The existence of a length
distribution reflects then in a distribution of oscillation frequencies which
is responsible for the Boson Peak in the glass density of states. Previously,
it has been shown that such a description can account for the elastic anomalies
reported at frequencies comparable with the Boson Peak. Here we start from the
generalized hydrodynamics to determine the dynamic correlation function
$S(k,\omega)$ associated with the coherent, dispersive and attenuated, sound
waves resulting from a sound-string interference. Once the vibrational density
of states has been measured, we can use it for univocally fixing the string
length distribution inherent to a given glass. The density-density correlation
function obtained using such distribution is strongly constrained, and able to
account for the experimental data collected on two prototypical glasses:
glycerol and silica. The obtained string length distribution is compatible with
the typical size of elastic heterogeneities previously reported for silica and
supercooled liquids, and the atomic motion associated to the string dynamics is
consistent with the soft modes recently identified in large scale numerical
simulations as non-phonon modes responsible for the Boson Peak. The theory is
thus in agreement with the most recent advances in the understanding of the
glass specific dynamics and offers an appealing simple understanding of the
microscopic origin of the latter, while raising new questions on the
universality or material-specificity of the string distribution properties.

15
The categories of this paper are: nucl-ex
34
The categories of this paper are: chem-ph
24
The categories of this paper are: dg-ga
28
The categories of this paper are: alg-geom
25
The categories of this paper are: patt-sol
5
The categories of this paper are: gr-qc
9
The categories of this paper are: nlin
6
The categories of this paper are: astro-ph
20
The categories of this paper are: acc-phys
0
The categories of this paper are: hep-ph
37
The categories of this paper are: supr-con
8
The categories of this paper are: hep-ex
33
The categories of this paper are: plasm-ph
27
The categories of this paper are: comp-gas
14
The categories of this paper are: math-ph
7
The categories of this paper are: hep-th