Based on the ABCD matrix formalism,the propagation property of an Airy beam from right-handed material（RHM） to left-handed material（LHM） is investigated.The result shows that when the Airy beam propagates in the L...Based on the ABCD matrix formalism,the propagation property of an Airy beam from right-handed material（RHM） to left-handed material（LHM） is investigated.The result shows that when the Airy beam propagates in the LHM,the intensity self-bending due to its propagation in the RHM can be compensated.In particular,if the propagation distance in the RHM is equal to that in the LHM and the refractive index of the LHM is n L =-1,the transverse intensity distribution of the Airy beam can return to its original state.展开更多
The epitaxial material, device structure, and corresponding equivalent large signal circuit model of GaAs planar Schottky varactor diode are successfully developed to design and fabricate a monolithic phase shifter, w...The epitaxial material, device structure, and corresponding equivalent large signal circuit model of GaAs planar Schottky varactor diode are successfully developed to design and fabricate a monolithic phase shifter, which is based on right-handed nonlinear transmission lines and consists of a coplanar waveguide transmission line and periodically distributed GaAs planar Schottky varactor diode. The distributed-Schottky transmission-line-type phase shifter at a bias voltage greater than 1.5 V presents a continuous 0°–360° differential phase shift over a frequency range from 0 to 33 GHz. It is demonstrated that the minimum insertion loss is about 0.5 dB and that the return loss is less than-10 dB over the frequency band of 0–33 GHz at a reverse bias voltage less than 4.5 V. These excellent characteristics, such as broad differential phase shift, low insertion loss, and return loss, indicate that the proposed phase shifter can entirely be integrated into a phased array radar circuit.展开更多
Numerical methods for Differential-Algebraic systems with discontinuous right-hand sides is discussed. A class of continuous Rosenbrock methods are constructed, and numerical experiments show that the continuous Rosen...Numerical methods for Differential-Algebraic systems with discontinuous right-hand sides is discussed. A class of continuous Rosenbrock methods are constructed, and numerical experiments show that the continuous Rosenbrock methods are effective. Applying the methods, a fast and high-precision numerical algorithm is given to deal with typical discontinuous parts, which occur frequently in differential-algebraic systems(DAS).展开更多
Updated measurements from the LHCb and SHoES collaborations have respectively strengthened the de-viations of the ratio R_(K)in rare semi-leptonic B-meson decays and the present-day Hubble parameter H_(0)in the Uni-ve...Updated measurements from the LHCb and SHoES collaborations have respectively strengthened the de-viations of the ratio R_(K)in rare semi-leptonic B-meson decays and the present-day Hubble parameter H_(0)in the Uni-verse,implying tantalizing hints of new physics beyond the standard model.In this paper,we consider a simple fla-vor-specific two-Higgs-doublet model,where long-standing R_(K(*))anomalies can be addressed by a one-flavor right-handed neutrino.An intriguing prediction resulting from the parameter space for the R_(K(*))resolution under flavor and clliderphysics constraints points toward a shift in the efective neutrino number,ON_(eff)=N_(eff)-N_(eff)^(SM),as a-favored way to ease the H_(0)tension.Depending on whether the neutrino is of the Dirac or Majorana type,we show that the resulting shift is △N_(eff)■1.0 for the former case and △N_(eff)■0.5 for the latter case.While the Dirac case is disfavored by the CMB polarization measurements,the Majorana solution is consistent with recent studies using a combined dataset from various sources.Consequently,such a simple flavor-specific two-Higgs-doublet model provides a link between R_(K(*)) anomalies and H_(0) tension,which in turn can be readily verified or disproved by up-comingmeasurements.展开更多
In the framework of the left-right twin Higgs model, we study pair production of the right-handed neutrinos at the International Linear Collider (ILC) and the CERN Large Hadron Collider (LHC). Our numerical results sh...In the framework of the left-right twin Higgs model, we study pair production of the right-handed neutrinos at the International Linear Collider (ILC) and the CERN Large Hadron Collider (LHC). Our numerical results show that the production cross section of the process e+e→N N is at the level of several tens fb at the ILC. However, the resonance production cross section can be significantly enhanced to the order of pb. The pair production cross section for the right-handed neutrinos is the level of several hundreds of fb at the LHC. In general, pair production of right-handed neutrinos gives rise to 2l+4j signal without missing energy. As long as the right-handed neutrinos are not too heavy, we conclude that its pair production might be used to test for the left-right twin Higgs model at the future ILC and LHC experiments.展开更多
基金Project supported by the National Natural Science Foundation of China (Grant Nos. 60977068,61178015 and 11102100)the Youth Foundation of Sanming University,China (Grant No. B201008/Q)
文摘Based on the ABCD matrix formalism,the propagation property of an Airy beam from right-handed material（RHM） to left-handed material（LHM） is investigated.The result shows that when the Airy beam propagates in the LHM,the intensity self-bending due to its propagation in the RHM can be compensated.In particular,if the propagation distance in the RHM is equal to that in the LHM and the refractive index of the LHM is n L =-1,the transverse intensity distribution of the Airy beam can return to its original state.
基金Project supported by the Fundamental Research Funds for Central Universities,China(Grant No.XDJK2013B004)the Research Fund for the Doctoral Program of Southwest University,China(Grant No.SWU111030)the State Key Laboratory for Millimeter Waves of Southeast University,China(Grant No.K201312)
文摘The epitaxial material, device structure, and corresponding equivalent large signal circuit model of GaAs planar Schottky varactor diode are successfully developed to design and fabricate a monolithic phase shifter, which is based on right-handed nonlinear transmission lines and consists of a coplanar waveguide transmission line and periodically distributed GaAs planar Schottky varactor diode. The distributed-Schottky transmission-line-type phase shifter at a bias voltage greater than 1.5 V presents a continuous 0°–360° differential phase shift over a frequency range from 0 to 33 GHz. It is demonstrated that the minimum insertion loss is about 0.5 dB and that the return loss is less than-10 dB over the frequency band of 0–33 GHz at a reverse bias voltage less than 4.5 V. These excellent characteristics, such as broad differential phase shift, low insertion loss, and return loss, indicate that the proposed phase shifter can entirely be integrated into a phased array radar circuit.
文摘Numerical methods for Differential-Algebraic systems with discontinuous right-hand sides is discussed. A class of continuous Rosenbrock methods are constructed, and numerical experiments show that the continuous Rosenbrock methods are effective. Applying the methods, a fast and high-precision numerical algorithm is given to deal with typical discontinuous parts, which occur frequently in differential-algebraic systems(DAS).
基金Supported by the National Natural Science Foundation of China(12135006,12075097,11675061,11775092)the Fundamental Research Funds for the Central Universities(CCNU20TS007,CCNU19TD012,CCNU22LJ004)。
文摘Updated measurements from the LHCb and SHoES collaborations have respectively strengthened the de-viations of the ratio R_(K)in rare semi-leptonic B-meson decays and the present-day Hubble parameter H_(0)in the Uni-verse,implying tantalizing hints of new physics beyond the standard model.In this paper,we consider a simple fla-vor-specific two-Higgs-doublet model,where long-standing R_(K(*))anomalies can be addressed by a one-flavor right-handed neutrino.An intriguing prediction resulting from the parameter space for the R_(K(*))resolution under flavor and clliderphysics constraints points toward a shift in the efective neutrino number,ON_(eff)=N_(eff)-N_(eff)^(SM),as a-favored way to ease the H_(0)tension.Depending on whether the neutrino is of the Dirac or Majorana type,we show that the resulting shift is △N_(eff)■1.0 for the former case and △N_(eff)■0.5 for the latter case.While the Dirac case is disfavored by the CMB polarization measurements,the Majorana solution is consistent with recent studies using a combined dataset from various sources.Consequently,such a simple flavor-specific two-Higgs-doublet model provides a link between R_(K(*)) anomalies and H_(0) tension,which in turn can be readily verified or disproved by up-comingmeasurements.
基金supported in part by the National Natural Science Foundation of China (Grant Nos. 10775039 and 10975047)
文摘In the framework of the left-right twin Higgs model, we study pair production of the right-handed neutrinos at the International Linear Collider (ILC) and the CERN Large Hadron Collider (LHC). Our numerical results show that the production cross section of the process e+e→N N is at the level of several tens fb at the ILC. However, the resonance production cross section can be significantly enhanced to the order of pb. The pair production cross section for the right-handed neutrinos is the level of several hundreds of fb at the LHC. In general, pair production of right-handed neutrinos gives rise to 2l+4j signal without missing energy. As long as the right-handed neutrinos are not too heavy, we conclude that its pair production might be used to test for the left-right twin Higgs model at the future ILC and LHC experiments.
