Yet More Ado about Nothing: the Remarkable Relativistic Vacuum State *

More Ado About Nothing : The Remarkable Relativistic Vacuum State ∗

An overview is given of what mathematical physics can currently say about the vacuum state for relativistic quantum field theories on Minkowski space. Along with a review of classical results such as the Reeh–Schlieder Theorem and its immediate and controversial consequences, more recent results are discussed. These include the nature of vacuum correlations and the degree of entanglement of the...

Much Ado About Nothing by William Shakespeare

More than 400 years after its first appearance in London, Much Ado about Nothing remains a popular stage play with both actors and audiences. Perhaps its success stems from Shakespeare’s compelling presentation of a number of themes with universal appeal, especially those related to courtship and marriage. In the plot of Much Ado young romantic love and faith at first fail, but ultimately true ...

Much Ado about Nothing: Vacuum and Renormalization on the Light-front

In the first part of my lectures, I will use the example of deep-inelastic scattering to explain why light-front coordinates play a distinguished role in many high energy scattering experiments. After a brief introduction into the concept of light-front quantization, I will show that the vacuum for any light-front Hamiltonian is trivial, i.e. the same as for non-interacting fields. In the rest ...

Singular Optics: more ado about nothing

www.econstor.eu Much Ado About Nothing? Smoking Bans and Germany’s Hospitality Industry

Over the last years, public smoking bans have been introduced in most European countries. Unlike elsewhere, in Germany such bans were introduced at state level at different points in time, which provides important intra-country regional variation that can be exploited to identify the effects of such bans on the hospitality industry. Using monthly data from a compulsory survey carried out by the...