1. |
- Marklund, Mattias, 1970-, et al.
(author)
-
High intensity physics current and future possibilities
- 2009
-
In: AIP Conference Proceedings. - : AIP. - 0094-243X .- 1551-7616. ; 1188:1, s. 301-314
-
Journal article (peer-reviewed)abstract
- The capability to produce high field strengths, and thereby obtain a new means for doing fundamental physics, has over the last thirty years taken great leaps forward. Both superconducting cavities as well ultra-intense lasers can now reach field strengths of the order 50 MV/m (stationary) and 1012 V/m (peak value, time-dependent field), respectively. Here we will describe a collection of problems that catches the flavor of the nonlinear quantum vacuum and the possibility to use high field strengths as a low-energy probe of fundamental physics.
|
|
2. |
- Ilderton, Anton, 1978-, et al.
(author)
-
Infra-red problems and a response
- 2009
-
In: QCD-TNT09. ; , s. 1-10
-
Conference paper (peer-reviewed)abstract
- The standard approach to the infra-red problem is to sum over degenerate final states to remove soft divergences (Bloch-Nordsiech), and over both initial and final states for collinear divergences (Lee-Nauenberg). We show that this division is inconsistent, and further that the Lee-Nauenberg recipe leads to ill-defined results in a variety of theories. We then argue that infra-red divergences are due to using unphysical variables to describe in and out states and introduce gauge invariant, physical ‘dressed’ states. Perturbative and non-perturbative properties of physical electron and quark states are then discussed. It is shown in SU(2) lattice simulations that the overlap between the ground state and our dressed state increases as we approach finer lattices.
|
|