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Author |
Navarro-Salas, J. |
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Title |
Black holes, conformal symmetry, and fundamental fields |
Type |
Journal Article |
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Year  |
2024 |
Publication |
Classical and Quantum Gravity |
Abbreviated Journal |
Class. Quantum Gravity |
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Volume |
41 |
Issue |
8 |
Pages |
085003 - 14pp |
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Keywords |
black holes; horizons; singularities; conformal symmetry; quantum fields; Standard Model |
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Abstract |
Cosmic censorship protects the outside world from black hole singularities and paves the way for assigning entropy to gravity at the event horizons. We point out a tension between cosmic censorship and the quantum backreacted geometry of Schwarzschild black holes, induced by vacuum polarization and driven by the conformal anomaly. A similar tension appears for the Weyl curvature hypothesis at the Big Bang singularity. We argue that the requirement of exact conformal symmetry resolves both conflicts and has major implications for constraining the set of fundamental constituents of the Standard Model. |
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Address |
[Navarro-Salas, Jose] Univ Valencia, Dept Fis Teor, IFIC, CSIC, E-46100 Burjassot, Valencia, Spain, Email: jnavarro@ific.uv.es |
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Publisher |
IOP Publishing Ltd |
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Language |
English |
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Abbreviated Series Title |
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Series Volume |
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ISSN |
0264-9381 |
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Conference |
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Notes |
WOS:001187435100001 |
Approved |
no |
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Is ISI |
yes |
International Collaboration |
no |
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Call Number |
IFIC @ pastor @ |
Serial |
6029 |
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Author |
Alves Batista, R. et al; Mitsou, V.A.; Olmo, G.J.; Zornoza, J.D. |
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Title |
White paper and roadmap for quantum gravity phenomenology in the multi-messenger era |
Type |
Journal Article |
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Year |
2025 |
Publication |
Classical and Quantum Gravity |
Abbreviated Journal |
Class. Quantum Gravity |
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Volume |
42 |
Issue |
3 |
Pages |
032001 - 47pp |
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Keywords |
quantum gravity phenomenology; Lorentz invariance violation and deformation; gamma-ray astronomy; cosmic neutrinos; ultra-high-energy cosmic rays; gravitational waves; spacetime foam |
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Abstract |
The unification of quantum mechanics and general relativity has long been elusive. Only recently have empirical predictions of various possible theories of quantum gravity been put to test, where a clear signal of quantum properties of gravity is still missing. The dawn of multi-messenger high-energy astrophysics has been tremendously beneficial, as it allows us to study particles with much higher energies and travelling much longer distances than possible in terrestrial experiments, but more progress is needed on several fronts. A thorough appraisal of current strategies and experimental frameworks, regarding quantum gravity phenomenology, is provided here. Our aim is twofold: a description of tentative multimessenger explorations, plus a focus on future detection experiments. As the outlook of the network of researchers that formed through the COST Action CA18108 'Quantum gravity phenomenology in the multi-messenger approach (QG-MM)', in this work we give an overview of the desiderata that future theoretical frameworks, observational facilities, and data-sharing policies should satisfy in order to advance the cause of quantum gravity phenomenology. |
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Address |
[Batista, R. Alves] Univ Autonoma Madrid, CSIC, Inst Fis Teor, C Nicolas Cabrera 13-15, Madrid 28049, Spain, Email: qgmm.cost@gmail.com; |
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Corporate Author |
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Publisher |
IOP Publishing Ltd |
Place of Publication |
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Editor |
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Language |
English |
Summary Language |
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Original Title |
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Series Editor |
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Abbreviated Series Title |
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Series Volume |
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Series Issue |
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ISSN |
0264-9381 |
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Conference |
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Notes |
WOS:001412292900001 |
Approved |
no |
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Is ISI |
yes |
International Collaboration |
yes |
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Call Number |
IFIC @ pastor @ |
Serial |
6555 |
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Author |
Bragado, A.; Olmo, G.J. |
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Title |
Periodic equatorial orbits in a black bounce scenario |
Type |
Journal Article |
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Year |
2025 |
Publication |
Classical and Quantum Gravity |
Abbreviated Journal |
Class. Quantum Gravity |
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Volume |
42 |
Issue |
18 |
Pages |
185004 - 30pp |
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Keywords |
general relativity; black bounce; Simpson-Visser model; periodic orbits |
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Abstract |
We study equatorial closed orbits in a popular black bounce model to see if the internal structure of these objects could lead to peculiar observable features. Paralleling the analysis of the Schwarzschild and Kerr metrics, we show that in the black bounce case each orbit can also be associated with a triplet of integers which can then be used to construct a rational number characterizing each periodic orbit. When the black bounce solution represents a traversable wormhole, we show that the previous classification scheme is still applicable with minor adaptations. We confirm in this way that this established framework enables a complete description of the equatorial dynamics across a spectrum of cases, from regular black holes to wormholes. Varying the black bounce parameter rmin, we compare the trajectories in the Simpson-Visser model with those in the Schwarzschild metric (and the rotating case with Kerr). We find that in some cases even small increments in rmin can lead to significant changes in the orbits. |
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Address |
[Bragado, Anderson; Olmo, Gonzalo J.] Univ Fed Ceara UFC, Dept Fis, Campus Pici,CP 6030, BR-60455760 Fortaleza, CE, Brazil, Email: andersonbragado@fisica.ufc.br; |
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Publisher |
IOP Publishing Ltd |
Place of Publication |
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Language |
English |
Summary Language |
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Original Title |
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Series Editor |
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Abbreviated Series Title |
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Series Volume |
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Series Issue |
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Edition |
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ISSN |
0264-9381 |
ISBN |
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Area |
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Expedition |
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Conference |
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Notes |
WOS:001569025300001 |
Approved |
no |
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Is ISI |
yes |
International Collaboration |
yes |
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Call Number |
IFIC @ pastor @ |
Serial |
6833 |
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Author |
Lima Junior, H.C.D.; Magalhaes, R.B.; Olmo, G.J.; Rubiera-Garcia, D. |
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Title |
On the resolution of space-time singularities in spherically symmetric black holes: geodesic completeness, curvature scalars, and tidal forces |
Type |
Journal Article |
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Year |
2025 |
Publication |
Classical and Quantum Gravity |
Abbreviated Journal |
Class. Quantum Gravity |
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Volume |
42 |
Issue |
22 |
Pages |
225004 - 34pp |
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Keywords |
geodesic completeness; space-time singularities; tidal forces; regular black holes |
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Abstract |
The existence of black holes in the Universe is nowadays established on the grounds of a blench of astrophysical observations, most notably those of gravitational waves from binary mergers and the imaging of supermassive objects at the heart of M87 and Milky Way galaxies. However, this success of Einstein's general relativity (GR) to connect theory of black holes with observations is also the source of its doom, since Penrose's theorem proves that, under physically sensible conditions, the development of a space-time singularity (as defined by the existence of a focal point for some geodesic paths in finite affine time) within black holes as described by GR is unavoidable. In this work, we thoroughly study how to resolve space-time singularities in spherically symmetric black holes. To do it so we find the conditions on the metric functions required for the restoration of geodesic completeness without any regards to the specific theory of the gravitational and matter fields supporting the amended metric. Our discussion considers both the usual trivial radial coordinate case and the bouncing radial function case and arrives to two mechanisms for this restoration: either the focal point is displaced to infinite affine distance or a bounce prevents the focusing of geodesics. Several explicit examples of well known (in)complete space-times are given. Furthermore, we consider the connection of geodesic (in)completeness with another criterion frequently used in the literature to monitor singular space-times: the blow up of (some sets of) curvature scalars and the infinite tidal forces they could bring with them, and discuss the conditions required for the harmlessness upon physical observers according to each criterion. |
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Address |
[Lima Junior, Haroldo C. D.] Univ Fed Maranhao, Dept Fis, Campus Univ Bacanga, BR-65080805 Sao Luis, Maranhao, Brazil, Email: haroldo.lima@ufma.br; |
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Corporate Author |
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Thesis |
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Publisher |
IOP Publishing Ltd |
Place of Publication |
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Editor |
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Language |
English |
Summary Language |
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Original Title |
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Series Editor |
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Series Title |
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Abbreviated Series Title |
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Series Volume |
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Series Issue |
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Edition |
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ISSN |
0264-9381 |
ISBN |
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Medium |
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Area |
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Expedition |
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Conference |
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Notes |
WOS:001613672000001 |
Approved |
no |
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Is ISI |
yes |
International Collaboration |
yes |
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Call Number |
IFIC @ pastor @ |
Serial |
6930 |
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Author |
Barbagallo, G.; Cerdeira, J.L.; Gomez-Fayren, C.; Ortin, T. |
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Title |
A note on the calculation of the Komar integral in the Lorentzian Taub-NUT spacetime |
Type |
Journal Article |
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Year |
2025 |
Publication |
Classical and Quantum Gravity |
Abbreviated Journal |
Class. Quantum Gravity |
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Volume |
42 |
Issue |
22 |
Pages |
227001 - 8pp |
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Keywords |
conserved quantities; Komar charge; Smarr formula; thermodynamics; Taub-NUT solution; Misner strings |
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Abstract |
It has recently been shown that one can derive consistent thermodynamical expressions in the Lorentzian Taub-NUT spacetime keeping the Misner-string singularities and taking into account their contributions in the Komar integrals. We show how the same results are obtained when the Misner-string singularities are removed by using Misner's procedure because, even though the complete spacetime has no such singularities anymore, they are unavoidable in all spacelike hypersurfaces which are used in the Komar integrals. Different choices of hypersurfaces may contain different strings and lead to different physics, though. |
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Address |
[Barbagallo, Gabriele; Cerdeira, Jose Luis, V; Gomez-Fayren, Carmen; Ortin, Tomas] UAM, CSIC, Inst Fis Teor, C Nicolas Cabrera 13-15,CU Cantoblanco, E-28049 Madrid, Spain, Email: gabriele.barbagallo@estudiante.uam.es; |
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Corporate Author |
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Thesis |
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Publisher |
IOP Publishing Ltd |
Place of Publication |
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Editor |
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Language |
English |
Summary Language |
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Original Title |
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Series Editor |
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Series Title |
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Abbreviated Series Title |
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Series Volume |
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Series Issue |
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Edition |
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ISSN |
0264-9381 |
ISBN |
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Medium |
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Area |
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Expedition |
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Conference |
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Notes |
WOS:001622716800001 |
Approved |
no |
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Is ISI |
yes |
International Collaboration |
no |
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Call Number |
IFIC @ pastor @ |
Serial |
6953 |
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| Permanent link to this record |
