Role of polarization-mode coupling in the crosstalk between cores of weakly-coupled multi-core fibers

Experimental indications for the role of the van Hove singularity (vHs) in the electronic density of states of high Tc superconductors are discussed. It is argued that (i) like the resistivity, the measured temperature and doping dependences of the normal state electronic specific heat of YBCO are consistent with the existence of a vHs and (ii) the doping dependence of Tc in the underdoped and optimally doped regimes may be accounted for mainly by a vHs. Further, we discuss the suppression of the quasiparticle scattering rate below Tc, and the coherence lengths in the hole-doped materials and NCCO. Assuming that the same mechanism for superconductivity operates in the electron-doped and the hole-doped cuprates, we argue that the bosonic mode that causes the superconductivity is strongly influenced by the doping in the overdoped regime. We further argue that this boson involves an energy scale larger than that of phonons and is only weakly coupled to the charge carriers.

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KÄHLER STABILIZED, MODULAR INVARIANT HETEROTIC STRING MODELS

International Journal of Modern Physics A ◽

10.1142/s0217751x07036439 ◽

2007 ◽

Vol 22 (08n09) ◽

pp. 1451-1588 ◽

Cited By ~ 27

Author(s):

MARY K. GAILLARD ◽

BRENT D. NELSON

Keyword(s):

Heterotic String ◽

Target Space ◽

Modular Invariant ◽

Heterotic String Theory ◽

Effective Lagrangian ◽

Parity Conservation ◽

Weakly Coupled ◽

String Models ◽

Early Universe Cosmology

We review the theory and phenomenology of effective supergravity theories based on orbifold compactifications of the weakly-coupled heterotic string. In particular, we consider theories in which the four-dimensional theory displays target space modular invariance and where the dilatonic mode undergoes Kähler stabilization. A self-contained exposition of effective Lagrangian approaches to gaugino condensation and heterotic string theory is presented, leading to the development of the models of Binétruy, Gaillard and Wu. Various aspects of the phenomenology of this class of models are considered. These include issues of supersymmetry breaking and superpartner spectra, the role of anomalous U(1) factors, issues of flavor and R-parity conservation, collider signatures, axion physics, and early universe cosmology. For the vast majority of phenomenological considerations the theories reviewed here compare quite favorably to other string-derived models in the literature. Theoretical objections to the framework and directions for further research are identified and discussed.

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High-Order Interference Effect Introduced by Polarization Mode Coupling in Polarization—Maintaining Fiber and Its Identification

Sensors ◽

10.3390/s16030419 ◽

2016 ◽

Vol 16 (3) ◽

pp. 419 ◽

Cited By ~ 3

Author(s):

Chuang Li ◽

Jun Yang ◽

Zhangjun Yu ◽

Yonggui Yuan ◽

Jianzhong Zhang ◽

...

Keyword(s):

Interference Effect ◽

Mode Coupling ◽

High Order ◽

Polarization Mode ◽

Polarization Maintaining Fiber ◽

Polarization Maintaining

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CP VIOLATION AND MODULI STABILIZATION IN HETEROTIC MODELS

Modern Physics Letters A ◽

10.1142/s0217732302007879 ◽

2002 ◽

Vol 17 (22) ◽

pp. 1465-1473 ◽

Cited By ~ 12

Author(s):

JOEL GIEDT

Keyword(s):

Supergravity Models ◽

Simple Model ◽

Cp Violation ◽

Scalar Potential ◽

Background Values ◽

Moduli Stabilization ◽

Weakly Coupled ◽

Potential Sources

The role of moduli stabilization in predictions for CP violation is examined in the context of four-dimensional effective supergravity models obtained from the weakly coupled heterotic string. We point out that while stabilization of compactification moduli has been studied extensively, the determination of background values for other scalars by dynamical means has not been subjected to the same degree of scrutiny. These other complex scalars are important potential sources of CP violation and we show in a simple model how their background values (including complex phases) may be determined from the minimization of the supergravity scalar potential, subject to the constraint of vanishing cosmological constant.

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