121 citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- University of LisbonPT135 papers
- Instituto Superior TécnicoPT23 papers
- Universidade Lusófona de Humanidades e TecnologiasPT23 papers
- Iscte – Instituto Universitário de LisboaPT8 papers
- Mathematical Institute of the Serbian Academy of Sciences and Arts7 papers
- Serbian Academy of Sciences and ArtsRS7 papers
- Universidad Complutense de MadridES7 papers
- Universidade LusófonaPT7 papers
- Universidade Técnica de LisboaPT7 papers
- University of AlgarvePT7 papers
- Instituto de Plasmas e Fusão NuclearPT6 papers
- Scuola Internazionale Superiore di Studi AvanzatiIT5 papers
18 papers · 1 filter
Self-dual cosmological Bianchi IX and VIII metrics
A. Mikovic, N. Manojlovic
We show that self-dual Bianchi IX and VIII cosmological models are described by the Nahm dynamical system for an appropriate type of matrices. We construct the general solutions in…
Hamiltonian analysis of the BFCG formulation of General Relativity
Aleksandar Mikovic, Miguel A. Oliveira, Marko Vojinovic
We perform the complete Hamiltonian analysis of the BFCG action for General Relativity. We determine all the constraints of the theory and classify them into the first-class and th…
Gravity-Matter Entanglement in Regge Quantum Gravity
Nikola Paunković, Marko Vojinović
We argue that Hartle-Hawking states in the Regge quantum gravity model generically contain non-trivial entanglement between gravity and matter fields. Generic impossibility to talk…
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…
Hamiltonian analysis of the BFCG theory for the Poincare 2-group
Aleksandar Mikovic, Miguel A. Oliveira, Marko Vojinovic
We perform the full Hamiltonian analysis of the topological BFCG action based on the Poincare 2-group. The Hamiltonian of the theory is constructed, and the algebra of constraints…
Cosmological Constant in a Quantum Gravity Theory for a Piecewise-linear Spacetime
Aleksandar Mikovic, Marko Vojinovic
We study the quantum contributions to the classical cosmological constant in a quantum gravity theory for GR with matter on a piecewise linear spacetime corresponding to a triangul…
Cosine problem in EPRL/FK spinfoam model
Marko Vojinovic
We calculate the classical limit effective action of the EPRL/FK spinfoam model of quantum gravity coupled to matter fields. By employing the standard QFT background field method a…
Spin-cube Models of Quantum Gravity
A. Mikovic
We study the state-sum models of quantum gravity based on a representation 2-category of the Poincare 2-group. We call them spin-cube models, since they are categorical generalizat…
Planetary motion on an expanding locally anisotropic background
P. Castelo Ferreira
In this work are computed analytical solutions for orbital motion on a background described by an Expanding Locally Anisotropic (ELA) metric ansatz. This metric interpolates betwee…
Constraining an Expanding Locally Anisotropic metric from the Pioneer anomaly
P. Castelo Ferreira
It is discussed the possibility of a fine-tuneable contribution to the two way Doppler acceleration either towards, either outwards the Sun for heliocentric distances above 20 AU b…
Noncanonical Phase-Space Noncommutative Black Holes
Catarina Bastos, Orfeu Bertolami, Nuno Dias +1
In this contribution we present a noncanonical phase-space noncommutative (NC) extension of a Kantowski Sachs (KS) cosmological model to describe the interior of a Schwarzschild bl…
Effective action for EPRL/FK spin foam models
Aleksandar Mikovic, Marko Vojinovic
We show that a natural modification of the EPRL/FK vertex amplitude gives a finite spin foam model whose effective action gives the Einstein-Hilbert action in the limit of large sp…
Poincare 2-group and quantum gravity
Aleksandar Mikovic, Marko Vojinovic
We show that General Relativity can be formulated as a constrained topological theory for flat 2-connections associated to the Poincaré 2-group. Matter can be consistently coupled…
Effective action and semiclassical limit of spin foam models
A. Mikovic, M. Vojinovic
We define an effective action for spin foam models of quantum gravity by adapting the background field method from quantum field theory. We show that the Regge action is the leadin…
A finiteness bound for the EPRL/FK spin foam model
Aleksandar Mikovic, Marko Vojinovic
We show that the EPRL/FK spin foam model of quantum gravity has an absolutely convergent partition function if the vertex amplitude is divided by an appropriate power of the pr…
Noncommutative Black Holes
C. Bastos, O. Bertolami, N. C. Dias +1
One considers phase-space noncommutativity in the context of a Kantowski-Sachs cosmological model to study the interior of a Schwarzschild black hole. It is shown that the potentia…
Large-spin asymptotics of Euclidean LQG flat-space wavefunctions
Aleksandar Mikovic, Marko Vojinovic
We analyze the large-spin asymptotics of a class of spin-network wavefunctions of Euclidean Loop Quantum Gravity, which corresponds to a flat spacetime. A wavefunction from this cl…
Invariants of Spin Networks Embedded in Three-Manifolds
João Faria Martins, Aleksandar Mikovic
We study the invariants of spin networks embedded in a three-dimensional manifold which are based on the path integral for SU(2) BF-Theory. These invariants appear naturally in Loo…