Results 41 to 50 of about 67,287 (207)

Wheeler-DeWitt equation and Feynman diagrams

, 1997
We present a systematic expansion of all constraint equations in canonical quantum gravity up to the order of the inverse Planck mass squared. It is demonstrated that this method generates the conventional Feynman diagrammatic technique involving ...
Andrei O. Barvinsky, Arnowitt, Avramidy, Banks, Barvinsky, Barvinsky, Barvinsky, Barvinsky, Barvinsky, Barvinsky, Barvinsky, Barvinsky, Barvinsky, Barvinsky, Barvinsky, Batalin, Batalin, Brout, Cangemi, Claus Kiefer, DeWitt, DeWitt, DeWitt, DeWitt-Morette, Dirac, Embacher, Faddeev, Fradkin, Fradkin, Fradkin, Giulini, Giulini, Halliwell, Halliwell, Hartle, Keski-Vakkuri, Kiefer, Kiefer, Kiefer, Kiefer, Kiefer, Kiefer, Kuchař, Lapchinsky, Leutwyler, Lifschytz, Massar, Parentani, Rosales, Teitelboim, Vilenkin   +50 more
core   +1 more source

Spin Foams and Canonical Quantization

Symmetry, Integrability and Geometry: Methods and Applications, 2012
This review is devoted to the analysis of the mutual consistency of the spin foam and canonical loop quantizations in three and four spacetime dimensions.
Sergei Alexandrov, Marc Geiller, Karim Noui   +2 more
doaj   +1 more source

On Characterizing the Quantum Geometry Underlying Asymptotic Safety

Frontiers in Physics, 2020
The asymptotic safety program builds on a high-energy completion of gravity based on the Reuter fixed point, a non-trivial fixed point of the gravitational renormalization group flow. At this fixed point the canonical mass-dimension of coupling constants
Aleksandr Kurov, Frank Saueressig
doaj   +1 more source

Magnetically Actuated Drops‐on‐Stilts Microrobots for Transport and Delivery of Hydrophobic Cargo

Advanced Materials Interfaces, EarlyView.
Iron oxide nanoparticles and oil droplets in external magnetic fields form “drops‐on‐stilts” microrobots that transport hydrophobic cargo. Tunable nanoparticle–droplet interactions generate stilt‐like structures. Field rotation enables walking, obstacle navigation, and collective motion.
Oluwafemi Ligan, Hrishabh Singh, Sahil Kulkarni, Hong Huy Tran, James M. Kikkawa, Daeyeon Lee, Ravi Radhakrishnan, Edward Steager, Hyun Koo, Kathleen Stebe   +9 more
wiley   +1 more source

MINISUPERSPACE MODEL FOR REVISED CANONICAL QUANTUM GRAVITY [PDF]

International Journal of Modern Physics D, 2004
We present a reformulation of the canonical quantization of gravity, as referred to the minisuperspace; the new approach is based on fixing a Gaussian (or synchronous) reference frame and then quantizing the system via the reconstruction of a suitable constraint; then the quantum dynamics is re-stated in a generic coordinates system and it becomes ...
openaire   +2 more sources

From Classical To Quantum Gravity: Introduction to Loop Quantum Gravity

, 2013
We present an introduction to the canonical quantization of gravity performed in loop quantum gravity, based on lectures held at the 3rd quantum geometry and quantum gravity school in Zakopane in 2011.
Giesel, Kristina, Sahlmann, Hanno
core   +1 more source

The volume operator in covariant quantum gravity [PDF]

, 2010
A covariant spin-foam formulation of quantum gravity has been recently developed, characterized by a kinematics which appears to match well the one of canonical loop quantum gravity.
Alexandrov S, Ashtekar A, Ashtekar A, Ashtekar A, Ashtekar A Campiglia M Henderson A, Baez J C, Barrett J W, Battisti M V Marciano A Rovelli C, Bianchi E Rovelli C Vidotto F, Carlo Rovelli, Engle J, Flori C, Flori C Thiemann T, Freidel L, Iwasaki J, Livine E, Noui K, Oriti D, Pereira R, Perez A, Reisenberger M P, Reisenberger M P, Reisenberger M P, Reisenberger M P, Rovelli C, Rovelli C, Rovelli C, Rovelli C Vidotto F, Smolin L, Thiemann T, You Ding   +30 more
core   +4 more sources

Intersecting Quantum Gravity with Noncommutative Geometry - a Review

Symmetry, Integrability and Geometry: Methods and Applications, 2012
We review applications of noncommutative geometry in canonical quantum gravity. First, we show that the framework of loop quantum gravity includes natural noncommutative structures which have, hitherto, not been explored.
Johannes Aastrup, Jesper Møller Grimstrup   +1 more
doaj   +1 more source

Photon‐Sphere Modes in Curved Optical Microcavities: A Black‐Hole Analogue Laser

Advanced Science, EarlyView.
An optical analogue of a Schwarzschild black hole is realized using curved microcavities that preserve light‐like geodesics. A new family of laser modes confined around the photon sphere is identified alongside conventional whispering‐gallery modes. Analytical theory, numerical simulations, and experiments reveal curvature‐induced confinement, enabling
Chenni Xu, Aswathy Sundaresan, Nazire‐Begüm Kazkal, Clement Lafargue, Lior Zarfaty, Li‐Gang Wang, Ofek Birnholtz, Dominique Decanini, Melanie Lebental, Patrick Sebbah   +9 more
wiley   +1 more source

QUANTUM GRAVITY BY THE COMPLEX CANONICAL FORMULATION [PDF]

International Journal of Modern Physics D, 1992
The basic features of the complex canonical formulation of general relativity and the recent developments in the quantum gravity program based on it are reviewed. The exposition is intended to be complementary to the review articles already available and some original arguments are included.
openaire   +3 more sources