Browsing Physics by Title

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  • Bazavov, A.; Bernard, C.; Bouchard, C.M.; DeTar, C.; Di Pierro, M.; El-Khadra, A.X.; Evans, R.T.; Freeland, E.D.; Gámiz, E.; Gottlieb, S.; ... (American Physical Society, 2012)
    We study $SU(3)$-breaking effects in the neutral $B_{d}-\overline{B}_{d}$ and $B_{s}-\overline{B}_{s}$ systems with unquenched $N_{f}=2+1$ lattice quantum chromodynamics (QCD). We calculate the relevant matrix elements on ...
  • Chodos, Alan; Hauser, Avi I.; Kostelecký, V.A. (Physics Letters B, 1985)
    We investigate the hypothesis that at least one of the known neutrinos travels faster than light. The current experimental situation is examined within this purview.
  • Kostelecký, V.A.; Samuel, S. (American Physical Society, 1995)
    Around one second after the big bang, neutrino decoupling and $e^{+-}e^-$ annihilation distorted the Fermi-Dirac spectrum of neutrino energies. Assuming neutrinos have masses and can mix, we compute the distortions using ...
  • Kostelecký, V.A.; Mewes, M. (American Physical Society, 2012)
    The behavior of fermions in the presence of Lorentz and CPT violation is studied. Allowing for operatorsof any mass dimension, we classify all Lorentz-violating terms in the quadratic Lagrange density for free fermions. ...
  • Carroll, S.M.; Harvey, J.A.; Kostelecký, V.A.; Lane, C.D.; Okamoto, T. (American Physical Society, 2001)
    The role of Lorentz symmetry in noncommutative field theory is considered. Any realistic noncommutative theory is found to be physically equivalent to a subset of a general Lorentz-violating standard-model extension involving ...
  • Kostelecký, V.A.; Samuel, S. (American Physical Society, 1994)
    We derive the equations that govern neutrino and antineutrino behavior in the early Universe. Results are presented from numerical simulations incorporating nonlinear effects of the neutrino-antineutrino background as well ...
  • Kostelecký, V.A.; Samuel, S. (American Physical Society, 1990)
    We use covariant string field theory to explore many-body string physics. A candidate nonperturbative vacuum is identified via a level-truncation scheme. The breaking of internal and Lorentz symmetries is investigated. We ...
  • Kostelecký, V.A.; Lane, C.D. (AIP Publishing, 1999)
    A method is presented for deriving the nonrelativistic quantum Hamiltonian of a free massive fermion from the relativistic Lagrangian of the Lorentz-violating standard-model extension. It permits the extraction of terms ...
  • Poplawski, N. (American Physical Society, 2012)
    The Einstein-Cartan-Sciama-Kibble theory of gravity removes the constraint of general relativity that the affine connection be symmetric by regarding its antisymmetric part, the torsion tensor, as a dynamical variable. The ...
  • Chodos, Alan; Kostelecký, V.A. (Physics Letters B, 1994)
    Recently, a type of null experiment for spacelike neutrinos has been proposed. We examine in detail a class of null tests involving nuclear beta decay or capture in atoms and ions. The most promising candidate systems are ...
  • Abazov, V.M.; Abbott, B.; Acharya, B.S.; Adams, M.; Adams, T.; Alexeev, G.D; Alkhazov, G.; Alton, A.; Alverson, G.; Aoki, M.; ... (American Physical Society, 2012)
    Using data corresponding to an integrated luminosity of 1.3fb -1, we observe a narrow mass state decaying into Υ(1S)+γ, where the Υ(1S) meson is detected by its decay into a pair of oppositely charged muons, and the photon ...
  • Kostelecký, V.A.; Perry, M.J.; Potting, R. (American Physical Society, 2000)
    The off-shell structure of the string sigma model is investigated. In the open bosonic string, nonperturbative effects appear to depend crucially on the regularization scheme. A scheme retaining the notion of string width ...
  • Kostelecký, V.A.; Lane, C.D.; Pickering, A.G.M. (American Physical Society, 2002)
    We show that the general Lorentz- and CPT-violating extension of quantum electrodynamics is one-loop renormalizable. The one-loop Lorentz-violating beta functions are obtained, and the running of the coefficients for Lorentz ...
  • Díaz, J.S.; Kostelecký, V.A.; Mewes, M. (American Physical Society, 2009)
    The effects of perturbative Lorentz and $CPT$ violation on neutrino oscillations are studied. Features include neutrino-antineutrino oscillations, direction dependence, and unconventional energy behavior. Leading-order ...
  • Kostelecký, V.A.; Samuel, S. (American Physical Society, 1989)
    We investigate measurable gravitational and cosmological effects in four dimensions that can arise from the compactification of higher-dimensional theories incorporating gravity. We identify the nature of effects due to ...
  • Kostelecký, V.A.; Samuel, S. (American Physical Society, 1991)
    We show that string theories allow interactions potentially leading to photon and graviton-mass terms when one or more scalar fields acquire vacuum expectation values. A general analysis is presented for the case when one ...
  • De Juan, F.; Fertig, H.A. (American Physical Society, 2012)
    Phonon dispersions generically display nonanalytic points, known as Kohn anomalies, due to electron-phonon interactions. We analyze this phenomenon for a zone-boundary phonon in undoped graphene. When electron-electron ...
  • Bluhm, R.; Kostelecký, V.A.; Lane, C.D.; Russell, N. (American Physical Society, 2003)
    Space-based experiments offer sensitivity to numerous unmeasured effects involving Lorentz and $CPT$ violation. We provide a classification of clock sensitivities and present explicit expressions for time variations arising ...
  • Kostelecký, V.A.; Tasson, J.D. (American Physical Society, 2009)
    Deviations from relativity are tightly constrained by numerous experiments. A class of unmeasured and potentially large violations is presented that can be tested in the laboratory only via weak-gravity couplings. Specialized ...
  • Bluhm, R.; Kostelecký, V.A. (American Physical Society, 1994)
    We show that a theoretical description of radial Rydberg wave packets in alkali-metal atoms based solely on hydrogenic wave functions and energies is insufficient to explain data that could be obtained in pump-probe ...

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