Principal investigator: Anđelo Samsarov
PI's Host institution: Ruđer Bošković Institute
Project duration: 01/03/2021 - 28/02/2025

Project Summary

Black holes are predicted by the theory of general relativity as a result of a gravitational collapse of massive astrophysical objects. Among other interesting properties of black holes is a property that they exist in a state of constant arousal. Indeed, realistic black holes can never be fully described by their basic parameters, as they are always in a state of perturbation.

Black hole perturbation is followed by a ringdown phase which is dominated by quasinormal modes (QNM). These modes may provide key signature of the gravitational waves.

During the ringdown phase, black holes gradually relax from the initial perturbation by emitting gravitational waves and presumed Hawking radiation. Notably, the presence of a deformed spacetime structure may distort this signal. In order to account for such effects, in this project we plan to utilise the methods of noncommutative geometry (NC) in order to construct and devise appropriate physical models which would be able to deal with new circumstances. The aim of this project is to invetigate the scalar, Dirac, vector and gravitational QNMs resulting from perturbations of realistic 4-dimensional black holes in a presence of quantized spacetime. The same setting of NC geometry we plan to apply in studying the impact of deformation on both the symmetry and the dispersion relations as revealed in a propagation of high energy gamma rays resulting from distant gamma ray bursts.

Project Members

Ana Bokulić

University of Zagreb, Croatia

Kumar Sankar Gupta

Saha Institute of Nuclear Physics, India

Nikola Herceg

RBI, Croatia

Tajron Jurić

RBI, Croatia

Nikola Konjik

IPB, Serbia

Naveena Kumara

RBI, Croatia

Salvatore Mignemi

Università degli Studi di Cagliari, Italy

Filip Požar

RBI, Croatia

Anđelo Samsarov (PI)

RBI, Croatia

Ivica Smolić

University of Zagreb, Croatia

List of Publications

Black hole thermodynamics in the presence of nonlinear electromagnetic fields
Ana Bokulić, Tajron Jurić, Ivica Smolić
Phys. Rev. D 103, 124059 (2021)

Observables in Quantum Mechanics and the Importance of Self-adjointness
Tajron Jurić
Universe 2022, 8, 129

Nonlinear electromagnetic fields in strictly stationary spacetimes
Ana Bokulić, Tajron Jurić, Ivica Smolić
Phys. Rev. D 105, 024067 (2022)

Arrival time from the general theory of quantum time distributions
Tajron Jurić, Hrvoje Nikolić
Eur. Phys. J. Plus 137 (2022) 5, 63

Constraints on singularity resolution by nonlinear electrodynamics
Ana Bokulić, Tajron Jurić, Ivica Smolić
Phys. Rev. D 106, 064020 (2022)

Passive quantum measurement: Arrival time, quantum Zeno effect and gambler's fallacy
Tajron Jurić, Hrvoje Nikolić
Accepted for publication in Fortschritte der Physik

Propagation of spinors on a noncommutative spacetime: equivalence of the formal and the effective approach
Marija Dimitrijević-Ćirić, Nikola Konjik, Andjelo Samsarov
Eur. Phys. J. C 83 (2023) 387

Noncommutativity and logarithmic correction to the black hole entropy
Kumar S. Gupta, Tajron Jurić, Anđelo Samsarov, Ivica Smolić
JHEP 02 (2023) 060

Noncommutative correction to the entropy of charged BTZ black hole
Tajron Jurić, Filip Požar
Symmetry 2023, 15(2), 417

Generalizations and challenges for the spacetime block-diagonalization
Ana Bokulić, Ivica Smolić
Class. Quantum Grav. 40 (2023) 165010

Noncommutative scalar field theory in a curved background: duality between noncommutative and effective commutative description
Marija Dimitrijević Ćirić, Nikola Konjik, Andjelo Samsarov

Event Organization

05-09 September 2022: Quantum aspects of Black Holes and Gravity, Zagreb, Croatia (A. Samsarov & T. Jurić)

Talks and Seminars

Spanish-Portugal Relativity Meeting EREP2021, 13-16 September 3021, Aveiro
  I. Smolić: Black hole thermodynamics in the presence of NLE fields

Fourth Annual Conference of COST Action CA18108 "Quantum gravity phenomenology in the multi-messenger approach"
10 - 14 July 2023, University of Rijeka, Faculty of Physics
  N. Herceg: Gravitational perturbations of noncommutative Schwarzschild black hole
  F. Požar: Black hole entropy and noncommutativity

The XII. International Symposium on Quantum Theory and Symmetries (QTS12)
24 - 28 July 2023, Technical University in Prague, Czech Republic
  A. Samsarov: Towards gravitational QNM spectrum from NC geometry

XXV SIGRAV Conference on General Relativity and Gravitation
4 - 8 September 2023, SISSA (Miramare campus)
  F. Požar: Black hole entropy and noncommutativity