extra dimensions
October 2012
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October 30, 2012feature: What else could the Higgs be?Scientists might need to go beyond the Standard Model to explain the mass of the Higgs-like boson observed at the Large Hadron Collider.
June 2011
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June 15, 2011breaking: String theory may hold answers about quark-gluon plasmaRecreating the conditions present just after the Big Bang has given experimentalists a glimpse into how the universe formed. Now, scientists have begun to see striking similarities between the properties of the early universe and a theory that aims to unite gravity with quantum mechanics, a long-standing goal for physicists.
June 2010
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June 4, 2010breaking: Could DZero result point to multiple Higgses?Theorists say the discovery of a significant imbalance between the production of matter and antimatter during particle collisions at the Tevatron points to new physics at work -- including the possibility that there may be five types of Higgs boson, rather than just one.
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June 3, 2010breaking: Anticipating the first steps beyond the Standard ModelMembers of the SLAC theory group describe the kinds of questions they are trying to answer and mysteries they are trying to resolve based on the expected first data from the Large Hadron Collider.
February 2010
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February 13, 2010breaking: Exotic particle of the day: the stringballStringballs are a kind of exotic particle that could exist at the end of the life of an evaporating black hole. If they exist, they would be in discovery reach of the Large Hadron Collider.
March 2009
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March 1, 2009feature: Result of the weekBehind every big breakthrough is a series of small steps that build on each other to enhance our understanding of the universe. At Fermilab''s Tevatron Collider, physicists have been telling the unfolding story of their experiments in weekly installments for more than five years.
April 2008
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April 14, 2008breaking: What can we expect from the LHC? (APS April 2008)In a press conference this morning, Abe Seiden of the University of California, Santa Cruz, showed a great timeline that plots the amount of data collected to be collected at the Large Hadron Collider against time and then pointed out where physicists expect to make certain discoveries if nature has those discoveries waiting to be made.
May 2007
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May 1, 2007explain it in 60 seconds: String theoryString theory proposes that the fundamental constituents of the universe are one-dimensional “strings” rather than point-like particles. What we perceive as particles are actually vibrations in loops of string, each with its own characteristic frequency.
February 2007
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February 1, 2007commentary: Abe Seiden: The Particle Physics RoadmapIn October 2006, the Particle Physics Project Prioritization Panel (P5) provided a new roadmap for a broad and very exciting science agenda in particle physics research. The roadmap’s destinations are among the most intriguing questions in science.
August 2006
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August 1, 2006feature: Introducing the Large Hadron ColliderOur understanding of the universe is about to change. For the past few decades, physicists have been able to describe with increasing detail the fundamental particles that make up the universe and the interactions at work between them. This understanding is encapsulated in what is known as the Standard Model of particle physics.
April 2006
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April 1, 2006commentary: Mel Shochet: The new HEPAPWe are at a time of extraordinary scientific opportunity, when the prospect for making major advances in elementary particle physics is greater than it has been in at least three decades. Our observations so far almost guarantee that new phenomena will soon be discovered at the TeV energy scale, first at the Tevatron or Large Hadron Collider and then hopefully in much greater detail at the International Linear Collider.
January 2006
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January 1, 2006feature: The search for extra dimensionsAlthough we now think of the universe as three bulky, nearly-flat dimensions, we might soon discover that the fabric of space-time consists of many more dimensions than we ever dreamed.
October 2005
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October 1, 2005editorial: WeirdThe universe is weird. With only 5 percent of the universe in our sight, potential new families of particles, possible extra dimensions, and mass created by an all-pervasive, invisible field, our understanding almost looks feeble. Ideas that once belonged to science fiction are now some of our best guesses for reality. The universe is weird—and now it is time to turn pro.
July 2005
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July 1, 2005explain it in 60 seconds: Extra dimensionsExtra dimensions sound like science fiction, but they could be part of the real world. And if so, they might help explain mysteries like why the universe is expanding faster than expected, and why gravity is weaker than the other forces of nature.
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July 1, 2005signal to background: Hot extra dimensionsThe most-cited paper in theoretical particle physics in 2004 was "A large mass hierarchy from a small extra dimension" by Lisa Randall and Raman Sundrum, published in Physical Review Letters in 1999.
June 2005
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June 30, 2005logbook: Extra dimensionsIn 1998, theorists Lisa Randall and Raman Sundrum met in a coffee shop in Boston to discuss how extra dimensions of space would change the predictions of particle theories.
January 2005
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January 1, 2005signal to background: Trends in extra dimensionsSometimes old papers can be highly influential, decades after their publication.
November 2004
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November 1, 2004commentary: Ray Orbach: Unusually exciting timesThese are unusually exciting times to be a physicist. At the dawn of the new millennium, some of the essential questions for humanity have taken a new urgency. What is our universe made of, and how did it get to look the way it does? What is the underlying nature of space and time?
