# Browsing Physics by Title

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• (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 ...
• (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.
• (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 ...
• (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. ...
• (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 ...
• (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 ...
• (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 ...
• (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 ...
• (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 ...
• (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 ...
• (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 ...
• (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 ...
• (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 ...
• (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 ...
• (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 ...
• (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 ...
• (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 ...
• (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 ...
• (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 ...
• (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 ...