Results 51 to 60 of about 74,976 (305)

Magnetic and electric properties of a quantum vacuum [PDF]

open access: yesReports on Progress in Physics, 2012
In this report we show that vacuum is a nonlinear optical medium and we discuss what are the optical phenomena that should exist in the framework of the standard model of particle physics. We pay special attention to the low energy limit. The predicted effects for photons of energy smaller than the electron rest mass are of such a level that none has ...
Battesti, Rémy, Rizzo, Carlo
openaire   +4 more sources

Retrodictive states and two-photon quantum imaging [PDF]

open access: yes, 2002
We use retrodictive quantum theory to analyse two-photon quantum imaging systems.
D. Neely   +707 more
core   +1 more source

Radiation reaction in quantum vacuum [PDF]

open access: yesProgress of Theoretical and Experimental Physics, 2015
From the development of the electron theory by H. A. Lorentz in 1906, many authors have tried to reformulate this model named "radiation reaction". P. A. M. Dirac derived the relativistic-classical electron model in 1938, which is now called the Lorentz-Abraham-Dirac model. But this model has the big difficulty of the run-away solution.
openaire   +2 more sources

Chiral Vacuum Fluctuations in Quantum Gravity [PDF]

open access: yesPhysical Review Letters, 2011
We examine tensor perturbations around a deSitter background within the framework of Ashtekar's variables and cousins parameterized by the Immirzi parameter $γ$. At the classical level we recover standard cosmological perturbation theory, with illuminating insights. Quantization leads to real novelties.
Magueijo J   +1 more
openaire   +4 more sources

Is the Zero-Point Energy Real? [PDF]

open access: yes, 2002
I consider the arguments to show that the vacuum energy density should receive a large contribution from the zero-point energy. This is the cosmological constant problem, as it was originally framed. I suggest that the matter is interpretation-dependent,
Simon Saunders, Saunders, Simon
core   +1 more source

Ultra-High Vacuum Cells Realized by Miniature Ion Pump Using High-Efficiency Plasma Source

open access: yesSensors
In recent years, there has been significant interest in quantum technology, characterized by the emergence of quantum computers boasting immense processing power, ultra-sensitive quantum sensors, and ultra-precise atomic clocks.
Yuichi Kurashima   +6 more
doaj   +1 more source

A Covariant Canonical Quantization of General Relativity

open access: yesAdvances in High Energy Physics, 2018
A Hamiltonian formulation of General Relativity within the context of the Nexus Paradigm of quantum gravity is presented. We show that the Ricci flow in a compact matter free manifold serves as the Hamiltonian density of the vacuum as well as a time ...
Stuart Marongwe
doaj   +1 more source

Mechanochemical Synthesis and Characterization of Nanostructured ErB4 and NdB4 Rare‐Earth Tetraborides

open access: yesAdvanced Engineering Materials, Volume 27, Issue 6, March 2025.
ErB4 and NdB4 nanostructured powders are produced by mechanochemical synthesis. 5 h mechanical alloying and 4 M HCl acid leaching are used in the production. ErB4 and NdB4 powders exhibit maximum magnetization of 0.4726 emu g−1 accompanied with an antiferromagnetic‐to‐paramagnetic phase transition at about TN = 18 K and 0.132 emu g−1 with a maximum at ...
Burçak Boztemur   +5 more
wiley   +1 more source

The concept of vacuum in quantum electrodynamics [PDF]

open access: yes, 2010
A re-evaluation of the concept of vacuum in quantum electrodynamics is presented, focusing on the vacuum of the quantized electromagnetic field. In contrast to the ‘nothingness’ associated to the idea of classical vacuum, subtle aspects are found in ...
bacelar valente, mario
core  

General method to synthesize aggregation‐induced emission molecules via carbon‐sulfur bond activation

open access: yesAggregate
Poly‐substituted olefins, one of the most important aggregation‐induced emission luminogens (AIEgens), have garnered significant attention due to their various applications in chemical‐ and bio‐sensing, bio‐imaging, and opto‐electronics.
Bowei Ma   +10 more
doaj   +1 more source

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