Information Technology Reference
In-Depth Information
18.4 STARnet Science Cases
This section describes the applications hosted by the STARnet science gateways.
Each application is implemented as a WSPGRADE/gUSE workflow to be executed
into different DCIs that are submitted in an interactive and intuitive way by means
of portlets using gUSE ASM API. The portlets allow workflow submissions
without requiring end users to have a priori any speci
c technical expertise related
to the particulars of the underlying DCI configurations.
The remainder of this section presents visualization-oriented workflows such as
LaSMoG (to examine modi
ed gravity models, Sect.
18.4.1
) based on VisIVO
workflows (for investigating large-scale datasets, Chap.
13
), and simulation-
oriented workflows such as FRANEC (for carrying out stellar evolution simula-
tions, Sect.
18.4.2
) and COMCAPT (to study the trajectories of interstellar comets
passing the Solar System, Sect.
18.4.4
). These workflows are stored into the
SHIWA workflow repository together with related metadata, allowing investigation
of their interoperability and dissemination across relevant communities through the
SHIWA simulation platform.
All the workflows can be exploited as templates for building new customized
workflows to suit particular requirements of scienti
c communities, e.g., LaSMoG
workflows can be generated by appropriately modifying constituent building blocks
of customized VisIVO workflows. The vision is, once a suf
cient number of
visualizations-oriented and simulation-oriented workflows have been developed, to
analyze any similarities in depth towards developing templates (workflow motifs)
for generating classes of workflows in order to address the needs of specialized
scienti
c communities (Garijo 2012). The remainder of this section focuses on the
technical details of the designed applications.
18.4.1 Large Simulations for Modified Gravity
The acceleration of the universe is one of the most challenging problems in cos-
mology. In the framework of general relativity (GR), the acceleration originates
from dark energy. However, to explain the current acceleration of the universe, the
required value of dark energy must be incredibly small. Recently, efforts have been
made to construct models for modi
ed gravity (i.e., without
introducing dark
energy) as an alternative to dark energy models (Zhao 2011).
Observing the large-scale structure of the universe could in principle provide a
new test of GR on cosmic scales. This kind of test cannot be done without the help
of simulations as the structure formation process is highly nonlinear. Large-scale
simulations, are thus performed for modi
ed gravity models, e.g., from the Large
Simulation for Modi
ed Gravity (LaSMoG) consortium.
The workflow shown in Fig.
18.2
implements a customized visualization to aid
in the analysis of modi
cally to inspect datasets in
order to discover anomalies by comparing appropriately with datasets coming from
ed GR simulations, more speci
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