Euler-Heisenberg lagrangian through Krein regularization

The Euler-Heisenberg effective action at the one-loop for a constant electromagnetic field is derived in Krein space quantization with Ford's idea of uctuated light-cone. In this work we present a perturbative, but convergent solution of the effective action. Without using any renormalization procedure, the result coincides with the famous renormalized Euler-Heisenberg action.Comment: arXiv admin note: text overlap with arXiv:1109.269

On the effective action of the vacuum photon splitting in Lorentz violating QED through Krein space

The finding of an explicit effective action describing amplitude of photon triple splitting is investigated through Krein space quantization and quantum metric fluctuation. Using the derivative expansion method, the one-loop radiative corrections from Lorentz- and CPT- violating extended Krein QED shows that it is not possible to find a nonzero effective action

QED effective action in Krein space quantization

The one-loop effective action of QED is calculated by the Schwinger method in Krein space quantization. We show that the effective action is naturally fnite and regularized. It also coincides with the renormalized solution which was derived by Schwinger.Comment: 15 pages, Accepted for publication in Phys.Lett.

Scalar effective action in Krein space quantization

In this paper, the \lambda\phi^4 scalar feld effective action, in the one-loop approximation, is calculated by using the Krein space quantization. We show that the effective action is naturally fnite and the singularity does not appear in the theory. The physical interaction mass, the running coupling constant and \beta-function are then calculated. The effective potential which is calculated in the Krein space quantization is different from the usual Hilbert space calculation, however we show that \beta-function is the same in the two different methods.Comment: 11 page

How a Small Teaching Center Made a Big Impact During the Pandemic Crises

For many faculty developers, 2020’s challenges changed our approach to our work. We found that by expanding our networks and relying on our collaborative spirit, we were able to adapt quickly and effectively to changing events. Each member of our four-person Learning + Teaching Center (LTC) team brings expertise and skills for faculty development. We employ a holistic approach to faculty development that not only provides programming for teaching improvement but also addresses the social and emotional needs of faculty and staff. The challenges of 2020 forced faculty and staff to work remotely, which necessitated more programming in how to use online technology. In addition, many faculty and staff were deeply troubled by the racial inequities brought to nationwide attention during the spring and summer. During these crises, we moved all of our programming online. We found that participation numbers increased online, but social interaction decreased. We recommend faculty developers continue offering online workshops in addition to in-person opportunities, work with faculty to adapt to new teaching opportunities, build up networks to bring in internal and external experts, and adopt an ethic of care for others and oneself

A Comparative Analysis of Government and Private Hospital Performance in the Republic of Yemen

This study compares the performance of government and private hospitals in the Republic of Yemen, focusing on patient satisfaction, quality of care, accessibility, and community involvement. Results indicate that private hospitals outshine government facilities in service quality, while government hospitals provide crucial access to low-income populations. Recommendations for improved collaboration and legislative reforms are discussed