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.
Physics2, 21 (2009) – Published March 16, 2009
Study of variations in the mass and interactions of quarks may reveal whether fundamental constants are governed by “environmental selection rules” that lead to complex universes capable of having observers.
Physics2, 10 (2009) – Published February 2, 2009
Many cosmologists believe that antiprotons in cosmic rays come from the annihilation of dark matter. Data from the PAMELA experiment on board a Russian satellite provide an important test of this possibility.