Quantum field theoretic extensions of Einstein’s theory of gravity tend to suffer from incurable infinities, but a theory called supergravity may actually avoid them—against expectations held for almost 30 years.
A huge, predicted atomic parity violation has now been observed in ytterbium, further aiding tabletop experimental searches for physics beyond the standard model that complement ongoing efforts at high-energy colliders.
Phys. Rev. Focus24, 6 (2009) – Published August 7, 2009
Ultrahigh energy photons striking matter can transform into rho mesons through an interaction that involves many nuclei simultaneously, a phenomenon that may affect the detection signatures of high-energy particles from space.
Phys. Rev. Focus23, 21 (2009) – Published June 24, 2009
Colliding protons can remain intact but still generate new particles, according to results from Fermilab. A similarly clean process could produce the elusive Higgs particle at CERN’s Large Hadron Collider.
New results from the Fermi Gamma-Ray Space Telescope, the most precise to date in the energy range to , should help resolve whether cosmic rays composed of the lightest charged particles, i.e., electrons and positrons, come from dark matter or some other astrophysical source.