La matière manquante de l'Univers enfin localisée ? ✨

Les astronomes ont longtemps cherché à comprendre où se cache la moitié de la matière ordinaire de l'Univers. La...

Meeting JS GRAM - AG FIRST-TF- WS QUANTIQUE 2023 - Sciencesconf.org

Italy's pasta row: a scientist on how to cook spaghetti properly and save money

Many Italians would disagree but there are ways of cooking pasta and saving energy.

A Note On The Canonical Formalism for Gravity

We describe a simple gauge-fixing that leads to a construction of a quantum Hilbert space for quantum gravity in an asymptotically Anti de Sitter spacetime, valid to all orders of perturbation theory. The construction is motivated by a relationship of the phase space of gravity in asymptotically Anti de Sitter spacetime to a cotangent bundle. We describe what is known about this relationship and some extensions that might plausibly be true. A key fact is that, under certain conditions, the Einstein Hamiltonian constraint equation can be viewed as a way to gauge fix the group of conformal rescalings of the metric of a Cauchy hypersurface. An analog of the procedure that we follow for Anti de Sitter gravity leads to standard results for a Klein-Gordon particle.