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20022026
most citedOverview of the SDSS-IV MaNGA Survey: Mapping Nearby Galaxies at Apache Point Observatory

1.7k citations

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Showing 2008 · gr-qcShow all

8 papers · 2 filters

gr-qc2008★ 36 cited

A Lagrangian approach to the Barrett-Crane spin foam model

Valentin Bonzom, Etera R. Livine

We provide the Barrett-Crane spin foam model for quantum gravity with a discrete action principle, consisting in the usual BF term with discretized simplicity constraints which in…

gr-qc2008★ 9 cited

Intertwiner dynamics in the flipped vertex

Emanuele Alesci, Eugenio Bianchi, Elena Magliaro +1

We continue the semiclassical analysis, started in a previous paper, of the intertwiner sector of the flipped vertex spinfoam model. We use independently both a semi-analytical and…

gr-qc2008★ 20 cited

A Note on B-observables in Ponzano-Regge 3d Quantum Gravity

Etera R. Livine, James P. Ryan

We study the insertion and value of metric observables in the (discrete) path integral formulation of the Ponzano-Regge spinfoam model for 3d quantum gravity. In particular, we dis…

gr-qc2008★ 23 cited

Spin-Foam Models and the Physical Scalar Product

Emanuele Alesci, Karim Noui, Francesco Sardelli

This paper aims at clarifying the link between Loop Quantum Gravity and Spin-Foam models in four dimensions. Starting from the canonical framework, we construct an operator P actin…

gr-qc2008★ 10 cited

The entropic boundary law in BF theory

Etera R. Livine, Daniel R. Terno

We compute the entropy of a closed bounded region of space for pure 3d Riemannian gravity formulated as a topological BF theory for the gauge group SU(2) and show its holographic b…

gr-qc2008★ 7 cited

How hot are expanding universes ?

Nathaniel Obadia

A way to address the conundrum of Quantum Gravity is to illustrate the potentially fundamental interplay between quantum field theory, curved space-times physics and thermodynamics…