Total Emission Damping

Total-Variation Regularization in Positron Emission Tomography

Emission lines in GRBs constrain the total energy reservoir

The emission features observed in the X–ray afterglow of Gamma Ray Bursts are extremely powerful. Since they last at least for several hours, they imply energies of the order of 10 ergs. This in turn implies that the energy contained in the illuminating continuum thought to be responsible of the line production must exceed 10 ergs. This is a strong lower limit to the energy reservoir of Gamma R...

Supersymmetric Partner Damping of Free Damping

We determine the class of damped modes ỹ which are related to the common free damping modes y by supersymmetry. They are obtained by employing the factorization of Newton’s differential equation of motion for the free damped oscillator by means of the general solution of the corresponding Riccati equation together with Witten’s method of constructing the supersymmetric partner operator. This pr...

TRASER - Total Reflection Amplification of Spontaneous Emission of Radiation

BACKGROUND AND OBJECTIVE Light and lasers in medical therapy have made dramatic strides since their invention five decades ago. However, the manufacture of lasers can be complex and expensive which often makes treatments limited and costly. Further, no single laser will provide the correct parameters to treat all things. Hence, laser specialists often need multiple devices to practice their spe...

A Computational Framework for Total Variation-Regularized Positron Emission Tomography

In positron emission tomography, image data corresponds to measurements of emitted photons from a radioactive tracer in the subject. Such count data is typically modeled using a Poisson random variable, leading to the use of the negative-log Poisson likelihood fit-to-data function. Regularization is needed, however, in order to guarantee reconstructions with minimal artifacts. Given that tracer...