the cosmic simulator daniel kasen (ucb & lbnl) peter nugent, rollin thomas, julian borrill &...

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The Cosmic The Cosmic Simulator Simulator Daniel Kasen (UCB & LBNL) Daniel Kasen (UCB & LBNL) Peter Nugent, Rollin Thomas, Peter Nugent, Rollin Thomas, Julian Borrill & Christina Julian Borrill & Christina Siegerist Siegerist

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Page 1: The Cosmic Simulator Daniel Kasen (UCB & LBNL) Peter Nugent, Rollin Thomas, Julian Borrill & Christina Siegerist

The Cosmic The Cosmic SimulatorSimulator

Daniel Kasen (UCB & LBNL)Daniel Kasen (UCB & LBNL)

Peter Nugent, Rollin Thomas, Peter Nugent, Rollin Thomas,

Julian Borrill & Christina Siegerist Julian Borrill & Christina Siegerist

Page 2: The Cosmic Simulator Daniel Kasen (UCB & LBNL) Peter Nugent, Rollin Thomas, Julian Borrill & Christina Siegerist

Daniel Kasen SC 2003 2

The History of the The History of the UniverseUniverse

Page 3: The Cosmic Simulator Daniel Kasen (UCB & LBNL) Peter Nugent, Rollin Thomas, Julian Borrill & Christina Siegerist

Daniel Kasen SC 2003 3

Foundations for a Cosmic Foundations for a Cosmic SimulatorSimulator

Planck

Sloan

LISA

JWST

EarlyUniverse

Galaxies & Large Scale Structure

Star Formation

Supernovae

Black Holes

JDEM

Observations

Simulations

Page 4: The Cosmic Simulator Daniel Kasen (UCB & LBNL) Peter Nugent, Rollin Thomas, Julian Borrill & Christina Siegerist

Daniel Kasen SC 2003 4

The National Virtual The National Virtual Observatory Observatory (NVO)(NVO)

The NVO links together disparate observational programs by:

- connecting distributed data components

- linking them to Grid computing resources

- developing standards for data interchange and data provenance

Computational Astrophysics must be linked in a similar fashion, and soon, or the data will overtake us….

Page 5: The Cosmic Simulator Daniel Kasen (UCB & LBNL) Peter Nugent, Rollin Thomas, Julian Borrill & Christina Siegerist

Daniel Kasen SC 2003 5

Cosmic SimulatorCosmic SimulatorSimulations no longer exist in splendid isolation, but now overlap in the intermediate regimes between their core domains. Component simulations can be linked together to provide a coherent, end-to-end, history of the Cosmos.

Simulation data will be made accessible for comparison with observations and for providing the initial conditions for the next simulation step.

Key issues include computational steering, grid and sub-grid selection and interpolation, and data interfaces.

Page 6: The Cosmic Simulator Daniel Kasen (UCB & LBNL) Peter Nugent, Rollin Thomas, Julian Borrill & Christina Siegerist

Daniel Kasen SC 2003 6

The Early UniverseThe Early Universe

Observations:Planck/CMB

Simulations:Julian Borrill

Page 7: The Cosmic Simulator Daniel Kasen (UCB & LBNL) Peter Nugent, Rollin Thomas, Julian Borrill & Christina Siegerist

Daniel Kasen SC 2003 7

Galaxy/Structure Galaxy/Structure FormationFormation

Observations:Sloan Digital Sky

Survey (SDSS)

Simulations:Joel Primack

Page 8: The Cosmic Simulator Daniel Kasen (UCB & LBNL) Peter Nugent, Rollin Thomas, Julian Borrill & Christina Siegerist

Daniel Kasen SC 2003 8

Supernova ExplosionsSupernova Explosions

Observations:Joint Dark EnergyMission (JDEM)

Simulations:A.Mezzacappa,

P. Nugent, D. Kasen

Page 9: The Cosmic Simulator Daniel Kasen (UCB & LBNL) Peter Nugent, Rollin Thomas, Julian Borrill & Christina Siegerist

Daniel Kasen SC 2003 9

Black Holes and Gravitational Black Holes and Gravitational RadiationRadiation

Observations:Laser Interferometer

from Space (LISA)

Simulations:Ed Siedel

Page 10: The Cosmic Simulator Daniel Kasen (UCB & LBNL) Peter Nugent, Rollin Thomas, Julian Borrill & Christina Siegerist

Daniel Kasen SC 2003 10

The Orgin of SupernovaeThe Orgin of SupernovaeConfronting Theory and Confronting Theory and

ObservationsObservations

Page 11: The Cosmic Simulator Daniel Kasen (UCB & LBNL) Peter Nugent, Rollin Thomas, Julian Borrill & Christina Siegerist

Daniel Kasen SC 2003 11

SNe Ia and their SNe Ia and their CompanionsCompanions

courtesy: http://zenith.as.arizona.edu/~burrows/movies.html

Marietta et al. (2000) examined the effects of asupernova running into its companion star.

The impact carves out a holein the supernova...

Page 12: The Cosmic Simulator Daniel Kasen (UCB & LBNL) Peter Nugent, Rollin Thomas, Julian Borrill & Christina Siegerist

Daniel Kasen SC 2003 12

Supernovae With a Hole?Supernovae With a Hole?

Unfortunately observed supernovae are too far away to be resolved, so we can’t directly look for such a hole.

Page 13: The Cosmic Simulator Daniel Kasen (UCB & LBNL) Peter Nugent, Rollin Thomas, Julian Borrill & Christina Siegerist

Daniel Kasen SC 2003 13

Supernova Spectra Supernova Spectra with simulations, we can interpret the with simulations, we can interpret the

colorscolors

Page 14: The Cosmic Simulator Daniel Kasen (UCB & LBNL) Peter Nugent, Rollin Thomas, Julian Borrill & Christina Siegerist

Daniel Kasen SC 2003 14

3-D Monte Carlo Radiation 3-D Monte Carlo Radiation TransferTransfer

Memory/Computing:Memory/Computing:

~ 10~ 1066 cells/10 cells/1033 wavelengths wavelengths

~20 GB~20 GB

~10^11 photons: ~10^11 photons:

~20,000 hours~20,000 hours

Scales well, currently runsScales well, currently runs

on ~2056 processors onon ~2056 processors on

the IBM SP Seaborg at the IBM SP Seaborg at NERSCNERSC

Page 15: The Cosmic Simulator Daniel Kasen (UCB & LBNL) Peter Nugent, Rollin Thomas, Julian Borrill & Christina Siegerist

Daniel Kasen SC 2003 15

Looking down and Looking down and around around the holethe hole

QuickTime™ and aNone decompressor

are needed to see this picture.

Changes in the spectrum provide signatures of the hole

Page 16: The Cosmic Simulator Daniel Kasen (UCB & LBNL) Peter Nugent, Rollin Thomas, Julian Borrill & Christina Siegerist

Daniel Kasen SC 2003 16

Diversity and AsymmetryDiversity and AsymmetryA unifying picture?A unifying picture?

Page 17: The Cosmic Simulator Daniel Kasen (UCB & LBNL) Peter Nugent, Rollin Thomas, Julian Borrill & Christina Siegerist

Daniel Kasen SC 2003 17

ConclusionsConclusionsAstronomy faces a data avalanche. Breakthroughs and advancements in telescope, detector, and computer technology allow astronomical surveys to produce terabytes of images and catalogs. These datasets will cover large fractions of the sky spanning the spectrum from gamma-rays through optical to radio, and will allow us to probe fundamental questions in physics and astronomy that were unimaginable just a few years ago.

However, the study and analysis of this data can only be accomplished with equal advancements in computational simulations and data reduction. The National Academy of Science Astronomy and Astrophysics Survey Committee in its Decadal survey recommends a multi-agency effort to establish the National Virtual Observatory (NVO).

Given the increasing involvement of the DOE in astrophysics and its long history of excellence in computational research the Cosmic Simulator is a natural goal. It also provides a direct link to the NVO. Together these will provide both the framework to link the archival data sets, ongoing space and ground surveys, and computational resources necessary to produce the best science possible as we attempt to understand the Universe from beginning to end.