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Physicists Set Strongest Limit on Mass of Dark Matter

By Guest PostNovember 30, 2011Science40 gev, alex geringer sameth, anti quark, brown university, cogent, cresst, croton on hudson, dama, dark matter, dark matter particle, dwarf galaxies, expansion of the universe, fermi gamma ray space telescope, fermi lat collaboration, galaxies, gamma ray, giga electron volts, gravitational effects, jet of particles, libra, limit, mass of dark matter, milky way galaxy, mysterious particle, NASA, nobel prize, physics, planets, quark, savvas koushiappas, signal to noise ratio, stars, theories, universe, weakly interacting massive particle, wimp

*Brown University physicists have set the strongest limit for the mass of dark matter, the mysterious particles believed to make up nearly a quarter of the universe. The researchers report in Physical Review Letters that dark matter must have a mass greater than 40 giga-electron volts. The distinction is important because it casts doubt on recent results from underground experiments that have reported detecting dark matter.*

PROVIDENCE, R.I. [Brown University] — If dark matter exists in the universe, scientists now have set the strongest limit to date on its mass.

In a paper to be published on Dec. 1 in Physical Review Letters (available in pdf), Brown University assistant professor Savvas Koushiappas and graduate student Alex Geringer-Sameth report that dark matter must have a mass greater than 40 giga-electron volts in dark-matter collisions involving heavy quarks. (The masses of elementary particles are regularly expressed in term of electron volts.) Using publicly available data collected from an instrument on NASA’s Fermi Gamma-ray Space Telescope and a novel statistical approach, the Brown pair constrained the mass of dark matter particles by calculating the rate at which the particles are thought to cancel each other out in galaxies that orbit the Milky Way galaxy. (more…)

When You Really, Really Have to go: Study Wins Ig Nobel Prize

By Guest PostOctober 2, 2011Scienceannals of improbable research, asthma symptoms, australia, brown university, cogstate ltd, elite company, harvard university, Ig nobel prizes honoring, new haven, robert h. pietrzak, scientific humor magazine, university of melbourne, university school of medicine, yale university

Past winners have included scientists who found that asthma symptoms can be treated with a roller coaster ride and veterinarians who reported cows with names give more milk than those without.

On Sept. 29 at Harvard University, Robert H. Pietrzak, assistant professor of psychiatry at the Yale University School of Medicine, joined this elite company as a co-winner of one of ten 2011 Ig Nobel Prizes honoring “science that makes people laugh and then makes them think.”

The scientific humor magazine Annals of Improbable Research recognized Pietrzak and his co-winners from Brown University, the University of Melbourne, and the firm CogState Ltd for their report last year that the extreme need to urinate creates cognitive difficulties equivalent to being fatigued or mildly impaired by alcohol. (more…)

The Waning of American Apartheid? Residential Segregation Declines in U.S. Metros

By Guest PostSeptember 9, 2011Culture1600 pennsylvania avenue, 2008 presidential election, apartheid, black neighbor, black white segregation, brown university, chicago and detroit, city of detroit, equal housing opportunities, healthcare, institute for social research, isr, local tax rates, motor city, obama family, racial attitudes of white detroiters, racial segregation, reynolds farley, united states, university of michigan, urban america

ANN ARBOR, Mich.— The ideal of equal housing opportunities is closer to becoming a reality in most major U.S. metro areas, according to a University of Michigan researcher.

“While black-white segregation remains high in many places, there are reasons to be optimistic that ‘apartheid’ no longer aptly describes much of urban America,” said Reynolds Farley, an investigator at the U-M Institute for Social Research (ISR) who studies racial segregation in the United States. (more…)

All Nine Women in Brown University Computer Science Class Intern at Microsoft

By Guest PostAugust 14, 20104 commentsTechnologyalex schultz, apple, avitabile, brown university, computer science, david hasselhoff, diversity, Google, macbu, macintosh business unit, megan hugdahl, Microsoft, nell elliott, parkinson, recruiters, redmond, summer working, women, yin lu

*After spending a summer working in Redmond, the junior class women of Brown University’s computer science department find new confidence.*

REDMOND, Wash. — This summer, all of the junior class women of Brown University’s computer science department found themselves interning at Microsoft.

They can field their own baseball team, with nine women in all — a group small enough to fit around a large lunch table at The Commons, but large enough to make for vibrant conversation. But baseball isn’t what these nine women all have in common – it’s computer science.

(more…)

Tag Archives: brown university

Physicists Set Strongest Limit on Mass of Dark Matter

When You Really, Really Have to go: Study Wins Ig Nobel Prize

The Waning of American Apartheid? Residential Segregation Declines in U.S. Metros

All Nine Women in Brown University Computer Science Class Intern at Microsoft