Dark Energy Measurement Sheds New Light on Universe's Expansion

In this optical and X-ray image of galaxy cluster Abell 2219, X-ray brightness from the Chandra X-ray observatory (pink) is superimposed on an optical image showing the distribution of starlight and galaxies in the cluster. The very hot gas that fills the cluster shines brightly at X-ray wavelengths. (Image courtesy Anja von der Linden et al.)

by Kelen Tuttle and Adam Mann

Through observations of massive galaxy clusters, scientists have made the most precise measurements to date of the effects of dark energy and gravity on cosmological scales. This work is an important step toward understanding why the expansion of the universe is accelerating. Something is pushing our universe apart, faster and faster, with each passing moment, and future work using similar methods should determine whether that something is dark energy or a change in the way gravity works on cosmological scales.

The analysis, contained in four papers published this month in the Monthly Notices of the Royal Astronomical Society, was led by a team based at the Kavli Institute for Particle Astrophysics and Cosmology. Read more...

(Photo by Barbara Hemstad.)

Welcome New SLACers!

by Maria Mastrokyriakos

On Wednesday, July 7, SLAC welcomed nine new staff members at New Employee Orientation. Please join us in congratulating our newest members as they embark on their successful pathways at SLAC!

Front Row (from left): Maria Mastrokyriakos and Niyati Dadhich.

Back Row (from left): Tak Sum "Sam" Chu, Ricardo Maida, Jeffrey Ludvik, Garth Brown, Raghuveer Ausoori, Marcus Keenan and Adam Egger.

Blogging ICHEP

by Shawne Workman

The 35th International Conference on High Energy Physics is near at hand, July 21–28 in Paris. A lively group of blogging physicists from around the globe is sharing perspectives on the conference online. Catch their thoughts at Blogging ICHEP 2010.

The BaBar collaboration will have a strong presence at ICHEP again this year, with BaBar speakers presenting a total of 24 talks, including one plenary session, according to BaBar Deputy Physics Analysis Coordinator Steven Robertson of McGill University.

"Looking back through the archive of previous ICHEP conferences, I think this ties our record for the number of physics parallel session talks for us," Robertson said. "ICHEP has traditionally been a very important milestone for us, so we interpret this as a very strong testament both to the continued high level of physics output from the collaboration and to the interest and importance of these measurements to the high energy physics community."

All of the ICHEP 2010 plenary and parallel sessions will be broadcast live on the Web, and will be made available as video afterward. Please see the conference Web site for instructions on how to attend these sessions remotely.

Events

Jul 14 (12:30 p.m.) SASS: Q&A with the SLAC Director
Jul 14 (3:00 p.m.) Radiation Physics Seminar: Simulation of The Radiation Levels in an Accelerator Environment
Jul 14 (4:00 p.m.) LCLS-PULSE Seminar: High Harmonic Generation in a Two-Color Field

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Sanitary Sewer Assessment in Progress

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Calendar
Registration

Today (8:00 a.m.)
Boom Lift Operator Training
Today (9:00 a.m.)
Control of Hazardous Energy
Today (1:00 p.m.) Haz Waste Management Refresher

Upcoming Workshops & Classes

Online Tech Training Opportunities

News (submit)

Higgs Boson: Is a Result Imminent? New Scientist Blogs
A Scientist Takes On Gravity NY Times
MIT Researchers Create Fibers That Can Detect and Produce Sound EurekAlert

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View online at http://today.slac.stanford.edu/.

Dark Energy Measurement Sheds New Light on Universe's Expansion In this optical and X-ray image of galaxy cluster Abell 2219, X-ray brightness from the Chandra X-ray observatory (pink) is superimposed on an optical image showing the distribution of starlight and galaxies in the cluster. The very hot gas that fills the cluster shines brightly at X-ray wavelengths. (Image courtesy Anja von der Linden et al.) by Kelen Tuttle and Adam Mann Through observations of massive galaxy clusters, scientists have made the most precise measurements to date of the effects of dark energy and gravity on cosmological scales. This work is an important step toward understanding why the expansion of the universe is accelerating. Something is pushing our universe apart, faster and faster, with each passing moment, and future work using similar methods should determine whether that something is dark energy or a change in the way gravity works on cosmological scales. The analysis, contained in four papers published this month in the Monthly Notices of the Royal Astronomical Society, was led by a team based at the Kavli Institute for Particle Astrophysics and Cosmology. Read more... (Photo by Barbara Hemstad.) Welcome New SLACers! by Maria Mastrokyriakos On Wednesday, July 7, SLAC welcomed nine new staff members at New Employee Orientation. Please join us in congratulating our newest members as they embark on their successful pathways at SLAC! Front Row (from left): Maria Mastrokyriakos and Niyati Dadhich. Back Row (from left): Tak Sum "Sam" Chu, Ricardo Maida, Jeffrey Ludvik, Garth Brown, Raghuveer Ausoori, Marcus Keenan and Adam Egger. Blogging ICHEP by Shawne Workman The 35th International Conference on High Energy Physics is near at hand, July 21–28 in Paris. A lively group of blogging physicists from around the globe is sharing perspectives on the conference online. Catch their thoughts at Blogging ICHEP 2010. The BaBar collaboration will have a strong presence at ICHEP again this year, with BaBar speakers presenting a total of 24 talks, including one plenary session, according to BaBar Deputy Physics Analysis Coordinator Steven Robertson of McGill University. "Looking back through the archive of previous ICHEP conferences, I think this ties our record for the number of physics parallel session talks for us," Robertson said. "ICHEP has traditionally been a very important milestone for us, so we interpret this as a very strong testament both to the continued high level of physics output from the collaboration and to the interest and importance of these measurements to the high energy physics community." All of the ICHEP 2010 plenary and parallel sessions will be broadcast live on the Web, and will be made available as video afterward. Please see the conference Web site for instructions on how to attend these sessions remotely.	Events Jul 14 (12:30 p.m.) SASS: Q&A with the SLAC Director Jul 14 (3:00 p.m.) Radiation Physics Seminar: Simulation of The Radiation Levels in an Accelerator Environment Jul 14 (4:00 p.m.) LCLS-PULSE Seminar: High Harmonic Generation in a Two-Color Field Access (see all) South Side Sector 19 Road Closed Jul 14 Piping Work in the SLAC Quad RSB Project Info and Updates Work in SSRL Parking Lot/Road to Research Yard No Storage in Former RV Area Announcements (see all \| submit) Lab Announcements Sanitary Sewer Assessment in Progress Community Bulletin Board Living Trust Seminar Jul 15 HIP Summer Classes Training ((see all \| register) Lab Training Calendar Registration Today (8:00 a.m.) Boom Lift Operator Training Today (9:00 a.m.) Control of Hazardous Energy Today (1:00 p.m.) Haz Waste Management Refresher Upcoming Workshops & Classes Online Tech Training Opportunities News (submit) Higgs Boson: Is a Result Imminent? New Scientist Blogs A Scientist Takes On Gravity NY Times MIT Researchers Create Fibers That Can Detect and Produce Sound EurekAlert
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	Tuesday - July 13, 2010