Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Time-changed processes governed by space-time fractional telegraph
  equations   In this work we construct compositions of processes of the form
\bm{S}_n^{2\beta}(c^2 \mathpzc{L}^\nu (t) \r, t>0, \nu \in (0, 1/2], \beta \in
(0,1], n \in \mathbb{N}, whose distribution is related to space-time fractional
n-dimensional telegraph equations. We present within a unifying framework the
pde connections of n-dimensional isotropic stable processes \bm{S}_n^{2\beta}
whose random time is represented by the inverse \mathpzc{L}^\nu (t), t>0, of
the superposition of independent positively-skewed stable processes,
\mathpzc{H}^\nu (t) = H_1^{2\nu} (t) + (2\lambda \r^{\frac{1}{\nu}} H_2^\nu
(t), t>0, (H_1^{2\nu}, H_2^\nu, independent stable subordinators). As special
cases for n=1, \nu = 1/2 and \beta = 1 we examine the telegraph process T at
Brownian time B (Orsingher and Beghin) and establish the equality in
distribution B (c^2 \mathpzc{L}^{1/2} (t)) \stackrel{\textrm{law}}{=} T
(|B(t)|), t>0. Furthermore the iterated Brownian motion (Allouba and Zheng) and
the two-dimensional motion at finite velocity with a random time are
investigated. For all these processes we present their counterparts as Brownian
motion at delayed stable-distributed time.

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The categories of this paper are: gr-qc
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The categories of this paper are: hep-ex
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The categories of this paper are: cond-mat
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The categories of this paper are: comp-gas
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The categories of this paper are: physics
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The categories of this paper are: dg-ga
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The categories of this paper are: econ
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The categories of this paper are: patt-sol
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The categories of this paper are: math-ph
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The categories of this paper are: plasm-ph
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The categories of this paper are: nlin
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The categories of this paper are: supr-con
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The categories of this paper are: eess
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The categories of this paper are: alg-geom
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The categories of this paper are: astro-ph
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The categories of this paper are: stat