37 citations · 222 across the 16 of their papers we have counts for
16 papers
Categorical generalization of spinfoam models
Aleksandar Mikovic, Marko Vojinovic
We give a brief review of the problem of quantum gravity. After the discussion of the nonrenormalizability of general relativity, we briefly mention the main research directions wh…
Quantum Gravity as a Deformed Topological Quantum Field Theory
A. Mikovic
It is known that the Einstein-Hilbert action with a positive cosmological constant can be represented as a perturbation of the SO(4,1) BF theory by a symmetry-breaking term quadrat…
Coherent States Expectation Values as Semiclassical Trajectories
N. C. Dias, A. Mikovic, J. N. Prata
We study the time evolution of the expectation value of the anharmonic oscillator coordinate in a coherent state as a toy model for understanding the semiclassical solutions in qua…
Quantum Field Theory of Open Spin Networks and New Spin Foam Models
A. Mikovic
We describe how a spin-foam state sum model can be reformulated as a quantum field theory of spin networks, such that the Feynman diagrams of that field theory are the spin-foam am…
Spin Foam Models of Matter Coupled to Gravity
A. Mikovic
We construct a class of spin foam models describing matter coupled to gravity, such that the gravitational sector is described by the unitary irreducible representations of the app…
Painleve III Equation and Bianchi VII_0 Model
N. Manojlovic, A. Mikovic
We examine the reduced phase space of the Bianchi VII_0 cosmological model, including the moduli sector. We show that the dynamics of the relevant sector of local degrees of freedo…
General Solution for Self-Gravitating Spherical Null Dust
A. Mikovic
We find the general solution of equations of motion for self-gravitating spherical null dust as a perturbative series in powers of the outgoing matter energy-momentum tensor, with…
Loop Corrections in the Spectrum of 2D Hawking Radiation
A. Mikovic, V. Radovanovic
We determine the one-loop and the two-loop back-reaction corrections in the spectrum of the Hawking radiation for the CGHS model of 2d dilaton gravity by evaluating the Bogoliubov…
Two-loop Back-reaction in 2D Dilaton Gravity
A. Mikovic, V. Radovanovic
We calculate the two-loop quantum corrections, including the back-reaction of the Hawking radiation, to the one-loop effective metric in a unitary gauge quantization of the CGHS mo…
W-Strings on Curved Backgrounds
A. Mikovic, B. Sazdovic
We discuss a canonical formalism method for constructing actions describing propagation of W-strings on curved backgrounds. The method is based on the construction of a representat…
W-Strings on Group Manifolds
A. Mikovicć, B. Sazdović
We present a procedure for constructing actions describing propagation of W-strings on group manifolds by using the Hamiltonian canonical formalism and representations of W-algebra…
Hawking Radiation and Back-Reaction in a Unitary Theory of 2D Quantum Gravity
A. Mikovic
We investigate the semiclassical limit and quantum corrections to the metric in a unitary quantum gravity formulation of the CGHS 2d dilaton gravity model. A new method for calcula…
Symplectic Structure of 2D Dilaton Gravity
A. Mikovic, M. Navarro
We analyze the symplectic structure of two-dimensional dilaton gravity by evaluating the symplectic form on the space of classical solutions. The case when the spatial manifold is…
Two-dimensional dilaton gravity in a unitary gauge
A. Mikovic
Reduced phase space formulation of CGHS model of 2d dilaton gravity is studied in en extrinsic time gauge. The corresponding Hamiltonian can be promoted into a Hermitian operator a…
Exactly Solvable Models of 2d Dilaton Quantum Gravity
A. Mikovic
We study canonical quantization of a class of 2d dilaton gravity models, which contains the model proposed by Callan, Giddings, Harvey and Strominger. A set of non-canonical phase…
Ashtekar Formulation of 2+1 Gravity on a Torus
N. Manojlovic, A. Mikovic
Pure (2+1)-dimensional Einstein gravity is analysed in the Ashtekar formulation, when the spatial manifold is a torus. We have found a set of globally defined observables, forming…