Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Resonance widening in spherical GW detectors: model descriptions of the
  dissipation processes   Internal friction effects are responsible for line widening of the resonance
frequencies in mechanical oscillators and result in damped oscillations of its
eigenmodes with a decay time Q/\omega. We study the solutions to the equations
of motion for the case of spherical oscillators, to be used as next generation
of acoustic gravitational wave detectors, based on various different
assumptions about the material's constituent equations. Quality factor
dependence on mode frequency is determined in each case, and a discussion of
its applicability to actual gravitational wave detectors is made on the basis
of available experimental evidence.

2
The categories of this paper are: math
29
The categories of this paper are: funct-an
13
The categories of this paper are: quant-ph
18
The categories of this paper are: econ
6
The categories of this paper are: astro-ph
35
The categories of this paper are: mtrl-th
22
The categories of this paper are: chao-dyn
8
The categories of this paper are: hep-ex
17
The categories of this paper are: q-fin
25
The categories of this paper are: patt-sol
12
The categories of this paper are: nucl-th
15
The categories of this paper are: nucl-ex
33
The categories of this paper are: plasm-ph
20
The categories of this paper are: acc-phys
9
The categories of this paper are: nlin
37
The categories of this paper are: supr-con