In this study,we investigated worldvolume fermions on the flavor brane in the D0-D4/D8 model,which is holographically equivalent to four-dimensional quantum chromodynamics with instantons or equivalently with a theta ...In this study,we investigated worldvolume fermions on the flavor brane in the D0-D4/D8 model,which is holographically equivalent to four-dimensional quantum chromodynamics with instantons or equivalently with a theta angle.The action involving the worldvolume fermions was obtained by the T-duality rules in string theory,and we accordingly derived their effective five-dimensional and canonical four-dimensional forms by using the systematic dimensional reduction and decomposition of the spinor.Subsequently,we used the AdS/CFT dictionary to evaluate the two-point correlation function as the spectral function for the worldvolume fermions and interpreted the fermions as baryons by analyzing their quantum number with the baryon vertex in holography.In this sense,the interacted action involving the worldvolume fermions and gauge field on the flavor brane was finally derived in holography,which describes the various interactions of mesons and baryons with instantons in the large-N limit.Therefore,this study provides a holographic picture to describe baryons and their interactions based on string theory,particularly in the presence of instantons or a theta angle.展开更多
We discuss the information paradox and its implications for regular black holes.Our primary focus is on Page curve using the island treatment and analyzing relevant parameters like Page time and scrambling time.Calcul...We discuss the information paradox and its implications for regular black holes.Our primary focus is on Page curve using the island treatment and analyzing relevant parameters like Page time and scrambling time.Calculations without considering the island show that the entanglement entropy increases linearly and continues to infinity.When we consider the generalized entropy,we find that the island extends just beyond the horizon,leading to a constant entanglement entropy.Specifically,we find that in the early stages,the island never forms,regardless of the charge and mass configuration of the black hole.展开更多
传统的开关器件脉频调制(Pulse Frequency Modulation,PFM)控制方法,存在开关频率高、频率不固定且稳定性能不好的缺点,使得它在APF的应用中增加了滤波器的设计难度。为此提出了以最优占空比为原则的改进脉频调制方法。该方法通过最小...传统的开关器件脉频调制(Pulse Frequency Modulation,PFM)控制方法,存在开关频率高、频率不固定且稳定性能不好的缺点,使得它在APF的应用中增加了滤波器的设计难度。为此提出了以最优占空比为原则的改进脉频调制方法。该方法通过最小二乘法获得最优占空比,并依此合理选择控制参数,且在控制器中,引入电网及补偿电压的实时特性,参与开关器件的导通时间、关断时间及滞环环宽的控制,从而实现定频、降损、提高控制精度及动态性能。通过对PFM的传统与改进控制策略的仿真与实验,验证了所提方法的有效性,且该方法易于控制电路的设计。展开更多
基金supported by the National Natural Science Foundation of China(Grant No.12005033)the Fundamental Research Funds for the Central Universities(Grant No.3132024192)。
文摘In this study,we investigated worldvolume fermions on the flavor brane in the D0-D4/D8 model,which is holographically equivalent to four-dimensional quantum chromodynamics with instantons or equivalently with a theta angle.The action involving the worldvolume fermions was obtained by the T-duality rules in string theory,and we accordingly derived their effective five-dimensional and canonical four-dimensional forms by using the systematic dimensional reduction and decomposition of the spinor.Subsequently,we used the AdS/CFT dictionary to evaluate the two-point correlation function as the spectral function for the worldvolume fermions and interpreted the fermions as baryons by analyzing their quantum number with the baryon vertex in holography.In this sense,the interacted action involving the worldvolume fermions and gauge field on the flavor brane was finally derived in holography,which describes the various interactions of mesons and baryons with instantons in the large-N limit.Therefore,this study provides a holographic picture to describe baryons and their interactions based on string theory,particularly in the presence of instantons or a theta angle.
基金Project supported by the National Natural Science Foundation of China(Grant Nos.12275166 and 12311540141)。
文摘We discuss the information paradox and its implications for regular black holes.Our primary focus is on Page curve using the island treatment and analyzing relevant parameters like Page time and scrambling time.Calculations without considering the island show that the entanglement entropy increases linearly and continues to infinity.When we consider the generalized entropy,we find that the island extends just beyond the horizon,leading to a constant entanglement entropy.Specifically,we find that in the early stages,the island never forms,regardless of the charge and mass configuration of the black hole.
文摘传统的开关器件脉频调制(Pulse Frequency Modulation,PFM)控制方法,存在开关频率高、频率不固定且稳定性能不好的缺点,使得它在APF的应用中增加了滤波器的设计难度。为此提出了以最优占空比为原则的改进脉频调制方法。该方法通过最小二乘法获得最优占空比,并依此合理选择控制参数,且在控制器中,引入电网及补偿电压的实时特性,参与开关器件的导通时间、关断时间及滞环环宽的控制,从而实现定频、降损、提高控制精度及动态性能。通过对PFM的传统与改进控制策略的仿真与实验,验证了所提方法的有效性,且该方法易于控制电路的设计。
