Silvia De Bianchi
Current Organizations / Institutes
The organizations/institutes from the scholar's latest article
Previous Organizations / Institutes
The organizations / institutes from the scholar's other articles in the past ten years
Research Subjects
Silvia De Bianchi has a total of 29 co-authors. Here are the top co-authors by number of shared publications:
- Emmanuele Battista
Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati
6 shared publications - Salvatore Capozziello
Scuola Superiore Meridionale
6 shared publications - Luciano Gabbanelli
Institut de Física d'Altes Energies (IFAE), The Barcelona Institute of Science and Technology, Barcelona, Spain
2 shared publications S. Gaudenzi
Dept. of Physics, Universita degli Studi di Roma ”La Sapienza”, Piazzale A. Moro 5, 00185 Rome, Italy
2 shared publicationsA. Pasquini
University of Siena
1 shared publication- Antonio Caciolli
Università degli Studi di Padova, 35131 Padova, Italy
1 shared publication
Latest Publications
- Open Access
- 19 December 2025
- Published by Milano University Press in The Reasoner
- Vol. 19 (4)
COSMOS
Overview of the aims, scope and results obtained within the CARIPLO funded COSMOS research project (2021-2026)
- 19 December 2025
- Published by Milano University Press in The Reasoner
- Vol. 19 (4)
Open AccessCOSMOS
Overview of the aims, scope and results obtained within the CARIPLO funded COSMOS research project (2021-2026)
- 6 August 2025
- Published by American Physical Society (APS) in Physical Review D
- Vol. 112 (4)
Null geodesics, causal structure, and matter accretion in Lorentzian-Euclidean black holes
- 6 August 2025
- Published by American Physical Society (APS) in Physical Review D
- Vol. 112 (4)
Null geodesics, causal structure, and matter accretion in Lorentzian-Euclidean black holes
- Open Access
Null geodesics, causal structure, and matter accretion in Lorentzian-Euclidean black holes
Recently, we introduced the Lorentzian-Euclidean black hole, a static and spherically symmetric solution of vacuum Einstein equations that exhibits a change in metric signature across the event horizon. In this framework, the analysis of radial trajectories of freely falling bodies proves that the central singularity can be avoided via a mechanism we interpret as atemporality, which is responsible for the shift of the time variable from real to imaginary values. In this paper, we further explore this model by first examining the behavior of null geodesics. Our investigation requires a set of signature-adaptive coordinate changes that generalize the local Lorentz transformations underlying General Relativity. We find that photon orbits, like their massive counterparts, cannot traverse the event horizon, thereby strengthening the previous result on the impossibility to reach the $r=0$ singularity. Additionally, we discuss the causal structure of the spacetime, provide the corresponding Penrose diagram, and analyze the process of matter accretion in the outer region of the black hole.Open AccessNull geodesics, causal structure, and matter accretion in Lorentzian-Euclidean black holes
Recently, we introduced the Lorentzian-Euclidean black hole, a static and spherically symmetric solution of vacuum Einstein equations that exhibits a change in metric signature across the event horizon. In this framework, the analysis of radial trajectories of freely falling bodies proves that the central singularity can be avoided via a mechanism we interpret as atemporality, which is responsible for the shift of the time variable from real to imaginary values. In this paper, we further explore this model by first examining the behavior of null geodesics. Our investigation requires a set of signature-adaptive coordinate changes that generalize the local Lorentz transformations underlying General Relativity. We find that photon orbits, like their massive counterparts, cannot traverse the event horizon, thereby strengthening the previous result on the impossibility to reach the $r=0$ singularity. Additionally, we discuss the causal structure of the spacetime, provide the corresponding Penrose diagram, and analyze the process of matter accretion in the outer region of the black hole. - Open Access
- 5 May 2025
- Published by Springer Nature in Foundations of Physics
- Vol. 55 (3) , 1-13
Atemporality from Conservation Laws of Physics in Lorentzian-Euclidean Black Holes
Recent results have shown that singularities can be avoided from the general relativistic standpoint in Lorentzian-Euclidean black holes by means of the transition from a Lorentzian to an Euclidean region where time loses its physical meaning and becomes imaginary. This dynamical mechanism, dubbed “atemporality”, prevents the emergence of black hole singularities and the violation of conservation laws. In this paper, the notion of atemporality together with a detailed discussion of its implications is presented from a philosophical perspective. The main result consists in showing that atemporality is naturally related to conservation laws.
- 5 May 2025
- Published by Springer Nature in Foundations of Physics
- Vol. 55 (3) , 1-13
Open AccessAtemporality from Conservation Laws of Physics in Lorentzian-Euclidean Black Holes
Recent results have shown that singularities can be avoided from the general relativistic standpoint in Lorentzian-Euclidean black holes by means of the transition from a Lorentzian to an Euclidean region where time loses its physical meaning and becomes imaginary. This dynamical mechanism, dubbed “atemporality”, prevents the emergence of black hole singularities and the violation of conservation laws. In this paper, the notion of atemporality together with a detailed discussion of its implications is presented from a philosophical perspective. The main result consists in showing that atemporality is naturally related to conservation laws.
- Open Access
Atemporality from Conservation Laws of Physics in Lorentzian-Euclidean Black Hole
Recent results have shown that singularities can be avoided from the general relativistic standpoint in Lorentzian-Euclidean black holes by means of the transition from a Lorentzian to an Euclidean region where time loses its physical meaning and becomes imaginary. This dynamical mechanism, dubbed ``atemporality'', prevents the emergence of black hole singularities and the violation of conservation laws. In this paper, the notion of atemporality together with a detailed discussion of its implications is presented from a philosophical perspective. The main result consists in showing that atemporality is naturally related to conservation laws.
Open AccessAtemporality from Conservation Laws of Physics in Lorentzian-Euclidean Black Hole
Recent results have shown that singularities can be avoided from the general relativistic standpoint in Lorentzian-Euclidean black holes by means of the transition from a Lorentzian to an Euclidean region where time loses its physical meaning and becomes imaginary. This dynamical mechanism, dubbed ``atemporality'', prevents the emergence of black hole singularities and the violation of conservation laws. In this paper, the notion of atemporality together with a detailed discussion of its implications is presented from a philosophical perspective. The main result consists in showing that atemporality is naturally related to conservation laws.
- 21 December 2024
- Published by Springer Nature in Foundations of Physics
- Vol. 55 (1) , 1-13
Achronotopic Interpretation of Quantum Mechanics
- 21 December 2024
- Published by Springer Nature in Foundations of Physics
- Vol. 55 (1) , 1-13
Achronotopic Interpretation of Quantum Mechanics
- 30 August 2024
- Published by Springer Nature
- p. 29-46
Not Even Ideal. Kant on Absolute Time and Gödel’s Rotating Universes
- 30 August 2024
- Published by Springer Nature
- p. 29-46
Not Even Ideal. Kant on Absolute Time and Gödel’s Rotating Universes
- Top Cited Papers
- 20 May 2024
- Published by American Physical Society (APS) in Physical Review D
- Vol. 109 (10) , 104060
Avoiding singularities in Lorentzian-Euclidean black holes: The role of atemporality
We investigate a Schwarzschild metric exhibiting a signature change across the event horizon, which gives rise to what we term a Lorentzian-Euclidean black hole. The resulting geometry is regularized by employing the Hadamard partie finie technique, which allows us to prove that the metric represents a solution of vacuum Einstein equations. In this framework, we introduce the concept of atemporality as the dynamical mechanism responsible for the transition from a regime with a real-valued time variable to a new one featuring an imaginary time. We show that this mechanism prevents the occurrence of the singularity and, by means of the regularized Kretschmann invariant, we discuss in which terms atemporality can be considered as the characteristic feature of this black hole.
- 20 May 2024
- Published by American Physical Society (APS) in Physical Review D
- Vol. 109 (10) , 104060
Top Cited PapersAvoiding singularities in Lorentzian-Euclidean black holes: The role of atemporality
We investigate a Schwarzschild metric exhibiting a signature change across the event horizon, which gives rise to what we term a Lorentzian-Euclidean black hole. The resulting geometry is regularized by employing the Hadamard partie finie technique, which allows us to prove that the metric represents a solution of vacuum Einstein equations. In this framework, we introduce the concept of atemporality as the dynamical mechanism responsible for the transition from a regime with a real-valued time variable to a new one featuring an imaginary time. We show that this mechanism prevents the occurrence of the singularity and, by means of the regularized Kretschmann invariant, we discuss in which terms atemporality can be considered as the characteristic feature of this black hole.
- 13 May 2024
- Published by Cambridge University Press (CUP) in Philosophy of Science
- Vol. 91 (3) , 1-4
“Philosophy of Astrophysics: Stars, Simulations, and the Struggle to Determine What is Out There”, edited by Nora Mills Boyd, Siska De Baerdemaeker , Kevin Heng, and Vera Matarese , Cham: Springer, 2023.
- 13 May 2024
- Published by Cambridge University Press (CUP) in Philosophy of Science
- Vol. 91 (3) , 1-4
“Philosophy of Astrophysics: Stars, Simulations, and the Struggle to Determine What is Out There”, edited by Nora Mills Boyd, Siska De Baerdemaeker , Kevin Heng, and Vera Matarese , Cham: Springer, 2023.
- Open Access
Avoiding singularities in Lorentzian-Euclidean black holes: the role of atemporality
We investigate a Schwarzschild metric exhibiting a signature change across the event horizon, which gives rise to what we term a Lorentzian-Euclidean black hole. The resulting geometry is regularized by employing the Hadamard partie finie technique, which allows us to prove that the metric represents a solution of vacuum Einstein equations. In this framework, we introduce the concept of atemporality as the dynamical mechanism responsible for the transition from a regime with a real-valued time variable to a new one featuring an imaginary time. We show that this mechanism prevents the occurrence of the singularity and, by means of the regularized Kretschmann invariant, we discuss in which terms atemporality can be considered as the characteristic feature of this black hole.
Open AccessAvoiding singularities in Lorentzian-Euclidean black holes: the role of atemporality
We investigate a Schwarzschild metric exhibiting a signature change across the event horizon, which gives rise to what we term a Lorentzian-Euclidean black hole. The resulting geometry is regularized by employing the Hadamard partie finie technique, which allows us to prove that the metric represents a solution of vacuum Einstein equations. In this framework, we introduce the concept of atemporality as the dynamical mechanism responsible for the transition from a regime with a real-valued time variable to a new one featuring an imaginary time. We show that this mechanism prevents the occurrence of the singularity and, by means of the regularized Kretschmann invariant, we discuss in which terms atemporality can be considered as the characteristic feature of this black hole.