25,551 research outputs found
The Formation of Classical Defects After a Slow Quantum Phase Transition
Classical defects (monopoles, vortices, etc.) are a characteristic
consequence of many phase transitions of quantum fields. We show a model in
which the onset of classical probability distributions, for the long-wavelength
modes at early times, allows the identification of line-zeroes of the field
with vortex separation. We obtain a refined version of Kibble's causal results
for defect separation, but from a completely different approach. It is apparent
that vortices are not created from thermal fluctuations in the Ginzburg regime.Comment: 10 pages, RevTex file. No figures. To appear in Phys. Lett.
Noise-induced energy excitation by a general environment
We analyze the effects that general environments, namely ohmic and non-ohmic,
at zero and high temperature induce over a quantum Brownian particle. We state
that the evolution of the system can be summarized in terms of two main
environmental induced physical phenomena: decoherence and energy activation. In
this article we show that the latter is a post-decoherence phenomenon. As the
energy is an observable, the excitation process is a direct indication of the
system-environment entanglement particularly useful at zero temperature.Comment: 14 pages; 7 figures. Version to appear in Phys Lett.
An explicit open image theorem for products of elliptic curves
Let be a number field and be elliptic curves over ,
pairwise non-isogenous over and without complex multiplication
over . We study the image of the adelic representation of the
absolute Galois group of naturally attached to . The main result is an explicit bound for the index of this image in
.Comment: 18 pages. v2: improved expositio
Hadronic B Decays at BABAR and BELLE
We review recent results of the BABAR and BELLE Collaborations on the the
alpha and gamma angles of the unitary triangle, on the B to K pi pi Dalitz-plot
analyses, and on the searches for baryonic B decays and for B to DD decays.Comment: SLAC-PUB-13240. To appear in the Proceedings of "Rencontres de
Moriond QCD and High Energy Interactions", La Thuile (Italy) March 8-15, 200
- …