Now showing items 48-61 of 61

    • Testing Gravity via Lunar Laser Ranging 

      Murphy, Tom (Georgia Institute of Technology, 2013-11-11)
      Forty years ago, Apollo astronauts placed the first of several retroreflector arrays on the moon. Laser range measurements between the earth and the moon have provided some of our best tests to date of general relativity ...
    • Thin film topological insulators: where do we stand and where are we headed? 

      Oh, Seongshik (Georgia Institute of Technology, 2016-10-17)
      About a decade ago, a little after graphene was discovered, a few theoretical physicists proposed that all solids can be grouped into different classes according to their band structure topologies: depending on which group ...
    • Topological Insulator Heterostructures: Searching for Exotic Particles on a Bench Top 

      Samarth, Nitin (Georgia Institute of Technology, 2012-10-08)
      A triumph of contemporary physics is the highly successful description of the most fundamental constituents of Nature and their excitations. Recent theories of “topological insulators” [1,2] have shown that in the complex ...
    • Toward Progress for All: Statistics on the Physics Community 

      Ivie, Rachel (Georgia Institute of Technology, 2014-10-20)
      The number of physics PhDs earned in 2012 reached an all-time high of more than 1700 doctorates, and the number of physics bachelor’s degrees doubled between 1999 and 2013. However, the recession of 2008 continues to ...
    • Ultra-high Energy Cosmic Rays from Blazars 

      Dermer, Charles (Georgia Institute of Technology, 2012-12-10)
      Blazar astronomy is rapidly progressing thanks in large part to the successes of the Fermi Gamma-ray Space Telescope and the ground-based gamma-ray telescopes. More than 1000 active galaxies have been detected at GeV ...
    • US Fusion Research 

      Hazeltine, Richard D. (Georgia Institute of Technology, 2012-08-27)
      This review of the US fusion research program has two parts. The first part (after a brief primer on fusion) surveys the plasma and fusion research issues that dominate the present US program. The second part discusses in ...
    • Using Growth and Folding to Shape Elastic Sheets 

      Santangelo, Chris (Georgia Institute of Technology, 2013-01-14)
      Despite their everyday familiarity, thin sheets (paper, plastic, fabric, etc.) display remarkable and complex behaviors that still challenge theoretical description. The intricate coupling between the geometry of surfaces ...
    • Using Mechanistic Modeling to Understand Non-Linear and Age-Dependent Effects of Genetic Factors 

      McGrath, Patrick (Georgia Institute of Technology, 2015-08-31)
      Differences in DNA sequence between two individuals or cells can cause diseases like autism and cancer. The McGrath lab is interested in understanding how changes in DNA lead to observable differences among individuals of ...
    • Vulcanized matter: Its statistics, its physics, and its statistical physics 

      Goldbart, Paul (Georgia Institute of Technology, 2011-08-24)
      As Goodyear discovered, when he first vulcanized rubber in 1839, a viscous liquid of macromolecules becomes an unusual, utterly random, solid, provided that enough chemical bonds are introduced between the molecules. Perhaps ...
    • Walter Kohn and the Creation of Density Functional Theory 

      Zangwill, Andrew (Georgia Institute of Technology, 2014-09-22)
      The theoretical physicist Walter Kohn was awarded one-half the 1998 Nobel Prize for Chemistry for his mid-1960's creation of an approach to the many-particle problem in quantum mechanics called density functional theory ...
    • Was Mars Ever Habitable? 

      Wray, James (Georgia Institute of Technology, 2013-04-15)
      NASA has followed the water on Mars, and has now progressed further to asking: is or was this environment ever actually habitable by life as we know it? All such life has some common physical and chemical requirements, ...
    • What Happened Before the Big Bang? 

      Bojowald, Martin (Georgia Institute of Technology, 2013-04-08)
      The standard model of cosmology suggests that the universe started with a phase of very high density, described by general relativity as a singularity. Quantum gravity attempts to resolve the singularity by a more fundamental, ...
    • What Sets the Maximum Spin Rate of Neutron Stars? 

      Wasserman, Ira (Georgia Institute of Technology, 2011-10-19)
      Neutron stars are observed to rotate as fast as 716 Hz. Astrophysicists believe that they are spun-up by accretion of matter and angular momentum in binary star systems. However, the “r-mode'' instability of rotating neutron ...
    • Why Meissner Was Wrong (or a Classical Explanation of Flux Expulsion from Superconductors) 

      Essén, Hanno (Georgia Institute of Technology, 2011-03-16)
      The discovery by Meissner and Ochsenfeld in 1933 that the magnetic field inside a conductor is expelled when it is cooled down to become superconducting was considered very surprising at the time. Meissner wrote that this ...