scholarly journals Background field approach to electromagnetic properties of baryons

2012 ◽  
Vol 85 (9) ◽  
Author(s):  
Tim Ledwig
Keyword(s):  
Background Field ◽  
Electromagnetic Properties ◽  
Field Approach

scholarly journals GENERAL FORMULA FOR THE FOUR-QUARK CONDENSATE AND VACUUM FACTORIZATION ASSUMPTION

2008 ◽  
Vol 23 (10) ◽  
pp. 1507-1520 ◽  
Author(s):  
HONG-SHI ZONG ◽  
DENG-KE HE ◽  
FENG-YAO HOU ◽  
WEI-MIN SUN
Keyword(s):  
General Formula ◽  
Linear Response ◽  
Chemical Potential ◽  
Background Field ◽  
Quark Propagator ◽  
Quark Condensate ◽  
Sum Rule ◽  
Factorization Problem ◽  
Field Approach ◽  
General Method

By differentiating the dressed quark propagator with respect to a variable background field, the linear response of the dressed quark propagator in the presence of the background field can be obtained. From this general method, using the vector background field as an illustration, we derive a general formula for the four-quark condensate [Formula: see text]. This formula contains the corresponding fully dressed vector vertex and it is shown that factorization for [Formula: see text] holds only when the dressed vertex is taken to be the bare one. This property also holds for all other types of four-quark condensate. By comparing this formula with the general expression for the corresponding vacuum susceptibility, it is found that there exists some intrinsic relation between these two quantities, which are usually treated as independent phenomenological inputs in the QCD sum rule external field approach. The above results are also generalized to the case of finite chemical potential and the factorization problem of the four-quark condensate at finite chemical potential is discussed.

Background-field approach to extended string theory

1988 ◽  
Vol 209 (4) ◽  
pp. 461-463 ◽  
Author(s):  
Shoichi Ichinose
Keyword(s):  
String Theory ◽  
Background Field ◽  
Field Approach

scholarly journals Renormalization of gauge theories in the background-field approach

2018 ◽  
Vol 2018 (7) ◽  
Author(s):  
Andrei O. Barvinsky ◽  
Diego Blas ◽  
Mario Herrero-Valea ◽  
Sergey M. Sibiryakov ◽  
Christian F. Steinwachs
Keyword(s):  
Gauge Theories ◽  
Background Field ◽  
Field Approach

scholarly journals Revisiting the Twist-3 Distribution Amplitudes of K Meson Within the QCD Background Field Approach

2012 ◽  
Vol 58 (2) ◽  
pp. 261-270 ◽  
Author(s):  
Tao Zhong ◽  
Xing-Gang Wu ◽  
Hua-Yong Han ◽  
Qi-Li Liao ◽  
Hai-Bing Fu ◽  
...  
Keyword(s):  
Background Field ◽  
K Meson ◽  
Field Approach

Facet Topography and Dislocation Structure as a Possible Source for Electrical Heterogeneity in [001] TILT Bicrystals of YBa2Cu3O7-δ

1996 ◽  
Vol 54 ◽  
pp. 338-339
Author(s):  
I-Fei Tsu ◽  
D.L. Kaiser ◽  
S.E. Babcock
Keyword(s):  
Grain Boundary ◽  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
Electromagnetic Properties ◽  
Length Scale ◽  
Density Values ◽  
Current Densities ◽  
Applied Fields ◽  
A Current

A current theme in the study of the critical current density behavior of YBa2Cu3O7-δ (YBCO) grain boundaries is that their electromagnetic properties are heterogeneous on various length scales ranging from 10s of microns to ˜ 1 Å. Recently, combined electromagnetic and TEM studies on four flux-grown bicrystals have demonstrated a direct correlation between the length scale of the boundaries’ saw-tooth facet configurations and the apparent length scale of the electrical heterogeneity. In that work, enhanced critical current densities are observed at applied fields where the facet period is commensurate with the spacing of the Abrikosov flux vortices which must be pinned if higher critical current density values are recorded. To understand the microstructural origin of the flux pinning, the grain boundary topography and grain boundary dislocation (GBD) network structure of [001] tilt YBCO bicrystals were studied by TEM and HRTEM.

Full-Field Approach for Modeling of Microstructural Evolutions During Forming Processes

2019 ◽  
Author(s):  
S. Andrietti ◽  
M. Bernacki ◽  
N. Bozzolo ◽  
L. Maire ◽  
P. De Micheli ◽  
...  
Keyword(s):  
Full Field ◽  
Field Approach
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