156 research outputs found
Renormalization of Wilson Operators in the Light-Cone Gauge
We test the renormalization of Wilson operators and the Mandelstam-
Leibbrandt gauge in the case when the sides of the loop are parallel to the n,
n* vectors used in the M-L gauge. Graphs which in the Feynman gauge are free of
ultra-violet divergences, in the M-L gauge show double divergences and single
divergences with non-local Si and Ci functions. These non-local functions
cancel out when we add all graphs together and the constraints of gauge
invariance are satisfied. In Appendix C we briefly discuss the problems of the
M-L gauge for loops containing spacelike lines.Comment: plain tex, 18 pages, 20 figures, revise
Some Observations on Non-covariant Gauges and the epsilon-term
We consider the Lagrangian path-integrals in Minkowski space for gauges with
a residual gauge-invariance. From rather elementary considerations, we
demonstrate the necessity of inclusion of an epsilon-term (even) in the formal
treatments, without which one may reach incorrect conclusions. We show,
further, that the epsilon-term can contribute to the BRST WT-identities in a
nontrivial way (even as epsilon-->0). We also show that the (expectation value
of the) correct epsilon-term satisfies an algebraic condition. We show by
considering (a commonly used) example of a simple local quadratic epsilon
-term, that they lead to additional constraints on Green's function that are
not normally taken into account in the BRST formalism that ignores the
epsilon-term, and that they are characteristic of the way the singularities in
propagators are handled. We argue that for a subclass of these gauges, the
Minkowski path-integral could not be obtained by a Wick rotation from a
Euclidean path-integral.Comment: 12 pages, LaTeX2
Development and Validation of Non-Integrative, Self-Limited, and Replicating Minicircles for Safe Reporter Gene Imaging of Cell-Based Therapies
Reporter gene (RG) imaging of cell-based therapies provides a direct readout of therapeutic efficacy by assessing the fate of implanted cells. To permit long-term cellular imaging, RGs are traditionally required to be integrated into the cellular genome. This poses a potential safety risk and regulatory bottleneck for clinical translation as integration can lead to cellular transformation. To address this issue, we have developed non-integrative, replicating minicircles (MCs) as an alternative platform for safer monitoring of cells in living subjects. We developed both plasmids and minicircles containing the scaffold/matrix attachment regions (S/MAR) of the human interferon-beta gene, driven by the CMV promoter, and expressing the bioluminescence RG firefly luciferase. Constructs were transfected into breast cancer cells, and expanded S/MAR minicircle clones showed luciferase signal for greater than 3 months in culture and minicircles remained as episomes. Importantly, luciferase activity in clonal populations was slowly lost over time and this corresponded to a loss of episome, providing a way to reversibly label cells. To monitor cell proliferation in vivo, 1.5×10(6) cells carrying the S/MAR minicircle were implanted subcutaneously into mice (n = 5) and as tumors developed significantly more bioluminescence signal was noted at day 35 and 43 compared to day 7 post-implant (p<0.05). To our knowledge, this is the first work examining the use of episomal, self-limited, replicating minicircles to track the proliferation of cells using non-invasive imaging in living subjects. Continued development of S/MAR minicircles will provide a broadly applicable vector platform amenable with any of the numerous RG technologies available to allow therapeutic cell fate to be assessed in individual patients, and to achieve this without the need to manipulate the cell's genome so that safety concerns are minimized. This will lead to safe tools to assess treatment response at earlier time points and improve the precision of cell-based therapies.The authors would like to acknowledge the imaging support provided by the Stanford Small Animal Imaging FacilityPublicad
Canonical Quantisation in n.A=0 gauges
We give a unified derivation of the propagator in the gauges for
timelike, spacelike or lightlike. We discuss the physical states and
other physical questions.Comment: 7 pages, DAMTP 93-33, ITP-SB-93-3
On the connection between Hamilton and Lagrange formalism in Quantum Field Theory
The connection between the Hamilton and the standard Lagrange formalism is
established for a generic Quantum Field Theory with vanishing vacuum
expectation values of the fundamental fields. The Effective Actions in both
formalisms are the same if and only if the fundamental fields and the momentum
fields are related by the stationarity condition. These momentum fields in
general differ from the canonical fields as defined via the Effective Action.
By means of functional methods a systematic procedure is presented to identify
the full correlation functions, which depend on the momentum fields, as
functionals of those usually appearing in the standard Lagrange formalism.
Whereas Lagrange correlation functions can be decomposed into tree diagrams the
decomposition of Hamilton correlation functions involves loop corrections
similar to those arising in n-particle effective actions. To demonstrate the
method we derive for theories with linearized interactions the propagators of
composite auxiliary fields and the ones of the fundamental degrees of freedom.
The formalism is then utilized in the case of Coulomb gauge Yang-Mills theory
for which the relations between the two-point correlation functions of the
transversal and longitudinal components of the conjugate momentum to the ones
of the gauge field are given.Comment: 25 pages, 24 figures, revised and extended version with an explicit
application of the formalism to Coulomb gauge QC
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