Untitled

Allen, Gabrielle; Benger, Werner; Dramlitsch, Thomas; Goodale, Tom; Hege, Hans-Christian; Lanfermann, Gerd; Merzky, André; Radke, Thomas; Seidel, Edward; Shalf, John

doi:10.1023/a:1011491422534

Cited by 52 publications

(10 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Indeed HTTP is far from being the only possible way to interact with a remote code, and thorns could be written to present allow interaction with a simulation via a SQL or LDAP interface, or as a web-service; there is already work on steering directly from visualisation clients using the streamed HDF5 interface [44].…”

Section: Future Plansmentioning

confidence: 99%

The Cactus Framework and Toolkit: Design and Applications

Goodale

Allen

Lanfermann

et al. 2003

Lecture Notes in Computer Science

Self Cite

245

249

View full text Add to dashboard Cite

Abstract. We describe Cactus, a framework for building a variety of computing applications in science and engineering, including astrophysics, relativity and chemical engineering. We first motivate by example the need for such frameworks to support multi-platform, high performance applications across diverse communities. We then describe the design of the latest release of Cactus (Version 4.0) a complete rewrite of earlier versions, which enables highly modular, multi-language, parallel applications to be developed by single researchers and large collaborations alike. Making extensive use of abstractions, we detail how we are able to provide the latest advances in computational science, such as interchangeable parallel data distribution and high performance IO layers, while hiding most details of the underlying computational libraries from the application developer. We survey how Cactus 4.0 is being used by various application communities, and describe how it will also enable these applications to run on the computational Grids of the near future. Application Frameworks in Scientific ComputingVirtually all areas of science and engineering, as well as an increasing number of other fields, are turning to computational science to provide crucial tools to further their disciplines. The increasing power of computers offers unprecedented ability to solve complex equations, simulate natural and man-made complex processes, and visualise data, as well as providing novel possibilities such as new forms of art and entertainment. As computational power advances rapidly, computational tools, libraries, and computing paradigms themselves also advance. In such an environment, even experienced computational scientists and engineers can easily find themselves falling behind the pace of change, while they redesign and rework their codes to support the next computer architecture. This

show abstract

Section: Future Plansmentioning

confidence: 99%

The Cactus Framework and Toolkit: Design and Applications

Goodale

Allen

Lanfermann

et al. 2003

Lecture Notes in Computer Science

Self Cite

245

249

View full text Add to dashboard Cite

show abstract

“…Local jobs on each resource in these test platforms are simulated with different job arrival rates and service rates, which follows the observation of over one million reallife processes generated from different academic workloads in Berkeley, as well as the machine usage pattern observation by researchers at Wisconsin-Madison, Maryland, Carnegie Mellon, et al [17]. Cactus [18], a numerical simulation of a 3D scalar field produced by two orbiting astrophysical sources, is used as our test application. In the test, we use the parallel version of Cactus application.…”

Section: Resultsmentioning

confidence: 99%

The GHS grid scheduling system: implementation and performance comparison

Sun

2006

Proceedings 20th IEEE International Parallel &Amp; Distributed Processing Symposium

View full text Add to dashboard Cite

show abstract

“…To evolve the hydrodynamics and spacetime we use the code of [121][122][123], which operates within the Cactus framework [124] and employs Carpet [125,126] for mesh refinement. The code solves the Einstein equations using the Baumgarte-Shapiro-Shibata-Nakamura formulation [127,128] within the 3+1 formalism.…”

Section: A Evolution Codementioning

confidence: 99%

The fate of twin stars on the unstable branch: implications for the formation of twin stars

Espino,

Paschalidis

2021

Preprint

View full text Add to dashboard Cite

Hybrid hadron-quark equations of state that give rise a third family of stable compact stars have been shown to be compatible with the LIGO-Virgo event GW170817. Stable configurations in the third family are called hybrid hadron-quark stars. The equilibrium stable hybrid hadron-quark star branch is separated by the stable neutron star branch with a branch of unstable hybrid hadronquark stars. The end-state of these unstable configurations has not been studied, yet, and it could have implications for the formation and existence of twin stars -hybrid stars with the same mass as neutron stars but different radii. We modify existing hybrid hadron-quark equations of state with a first-order phase transition in order to guarantee a well-posed initial value problem of the equations of general relativistic hydrodynamics, and study the dynamics of non-rotating or rotating unstable twin stars via 3-dimensional simulations in full general relativity. We find that unstable twin stars naturally migrate toward the hadronic branch. Before settling into the hadronic regime, these stars undergo (quasi)radial oscillations on a dynamical timescale while the core bounces between the two phases. Our study suggests that it may be difficult to form stable twin stars if the phase transition is sustained over a large jump in energy density, and hence it may be more likely that astrophysical hybrid hadron-quark stars have masses above the twin star regime. We also study the minimum-mass instability for hybrid stars, and find that these configurations do not explode, unlike the minimummass instability for neutron stars. Additionally, our results suggest that oscillations between the two Quantum Chromodynamic phases could provide gravitational wave signals associated with such phase transitions in core-collapse supernovae and white dwarf-neutron star mergers.1 Henceforth we refer to EOSs which include both hadron and quark degrees of freedom as "hybrid EOSs", and stars that contain both hadronic and quark phases as "hybrid stars". Hybrid stars with the same mass as neutron stars are referred to as "twin stars."

show abstract

Untitled

Cited by 52 publications

References 5 publications

The Cactus Framework and Toolkit: Design and Applications

The Cactus Framework and Toolkit: Design and Applications

The GHS grid scheduling system: implementation and performance comparison

The fate of twin stars on the unstable branch: implications for the formation of twin stars

Contact Info

Product

Resources

About