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Danielsson, Ulf
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Publications (10 of 93) Show all publications
Giri, S., Danielsson, U., Lehner, L. & Pretorius, F. (2025). Exploring black hole mimickers: Electromagnetic and gravitational signatures of AdS black shells. Physical Review D: covering particles, fields, gravitation, and cosmology, 111(2), Article ID 024007.
Open this publication in new window or tab >>Exploring black hole mimickers: Electromagnetic and gravitational signatures of AdS black shells
2025 (English)In: Physical Review D: covering particles, fields, gravitation, and cosmology, ISSN 2470-0010, E-ISSN 2470-0029, Vol. 111, no 2, article id 024007Article in journal (Refereed) Published
Abstract [en]

We study electromagnetic and gravitational properties of anti-de Seitter (AdS) black shells (also referred to as AdS black bubbles)-a class of quantum gravity motivated black hole mimickers, that in the classical limit are described as ultracompact shells of matter. We find that their electromagnetic properties are remarkably similar to black holes. We then discuss the extent to which these objects are distinguishable from black holes, both for intrinsic interest within the black shell model, and as a guide for similar efforts in other subclasses of exotic compact objects (ECOs). We study photon rings and lensing band characteristics, relevant for very large baseline interferometry (VLBI) observations, as well as gravitational wave observables-quasinormal modes in the eikonal limit and the static tidal Love number for nonspinning shells-relevant for ongoing and upcoming gravitational wave observations.

Place, publisher, year, edition, pages
American Physical Society, 2025
National Category
Astronomy, Astrophysics and Cosmology Subatomic Physics
Identifiers
urn:nbn:se:uu:diva-548458 (URN)10.1103/PhysRevD.111.024007 (DOI)001397042700006 ()2-s2.0-85214310948 (Scopus ID)
Funder
Swedish Research Council, 2022-06157
Available from: 2025-01-27 Created: 2025-01-27 Last updated: 2025-01-27Bibliographically approved
Danielsson, U. & Van Hemelryck, V. (2024). Charged Nariai black holes on the dark bubble. Classical and quantum gravity, 41(24), Article ID 245011.
Open this publication in new window or tab >>Charged Nariai black holes on the dark bubble
2024 (English)In: Classical and quantum gravity, ISSN 0264-9381, E-ISSN 1361-6382, Vol. 41, no 24, article id 245011Article in journal (Refereed) Published
Abstract [en]

In this paper, we realise the charged Nariai black hole on a braneworld from a nucleated bubble in AdS5, known as the dark bubble model. Geometrically, the black hole takes the form of a cylindrical spacetime pulling on the dark bubble. This is realised by a brane embedding in an AdS5 black string background. Identifying the brane with a D3-brane in string theory allows us to determine a relation between the fine structure constant and the string coupling, αEM = 3/2 gs, which was previously obtained for a microscopic black hole. We also speculate on the consequences for the Festina Lente bound and neutrino masses.

Place, publisher, year, edition, pages
Institute of Physics Publishing (IOPP), 2024
Keywords
dark bubble, black hole, string theory, Nariai, black strings
National Category
Subatomic Physics
Identifiers
urn:nbn:se:uu:diva-544239 (URN)10.1088/1361-6382/ad8f8d (DOI)001358791100001 ()2-s2.0-85210068706 (Scopus ID)
Funder
Olle Engkvists stiftelse
Available from: 2024-12-04 Created: 2024-12-04 Last updated: 2024-12-04Bibliographically approved
Danielsson, U. & Giri, S. (2024). Horizonless black hole mimickers with spin. Physical Review D: covering particles, fields, gravitation, and cosmology, 109(2), Article ID 024038.
Open this publication in new window or tab >>Horizonless black hole mimickers with spin
2024 (English)In: Physical Review D: covering particles, fields, gravitation, and cosmology, ISSN 2470-0010, E-ISSN 2470-0029, Vol. 109, no 2, article id 024038Article in journal (Refereed) Published
Abstract [en]

In this paper, we study rotating horizonless black shells as an alternative to Kerr black holes. We make use of Ernst’s potential to solve the Einstein equations perturbatively in the angular momentum a. Calculating to order a6, we find accurate predictions up to about a = 0.45, where the quadrupole moment is predicted to be around 1% higher than its Kerr value; higher multipole moments show deviation of the order of ∼ 10%. Our analysis takes into account deformations of the black shells, and we propose that it can be used for numerical simulations comparing gravitational waves emitted by orbiting black shells with those emitted by orbiting black holes. We find that matter on the rotating shell takes the form of a viscous fluid. We make extensive use of relativistic hydrodynamics, and discover an intricate structure of circulating flows of this fluid and heat on the black shell, sustained by the Unruh effect.

Place, publisher, year, edition, pages
American Physical Society, 2024
National Category
Other Physics Topics
Identifiers
urn:nbn:se:uu:diva-527248 (URN)10.1103/PhysRevD.109.024038 (DOI)001173299800008 ()
Funder
Swedish Research Council, 2022-06157
Available from: 2024-04-26 Created: 2024-04-26 Last updated: 2024-04-26Bibliographically approved
Basile, I., Danielsson, U., Giri, S. & Panizo Pérez, D. (2024). Shedding light on dark bubble cosmology. Journal of High Energy Physics (JHEP) (2), Article ID 112.
Open this publication in new window or tab >>Shedding light on dark bubble cosmology
2024 (English)In: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, no 2, article id 112Article in journal (Refereed) Published
Abstract [en]

Dark bubble cosmology is an alternative paradigm to compactification, which can circumvent issues of moduli stabilization and scale separation. In this paper we investigate how electromagnetic fields can be incorporated in this framework. Worldvolume fields backreact on the ambient universe in which the bubble expands, which in turn affects the energy-momentum distribution and the effective gravity induced on the brane. We compute these effects, showing that the resulting four-dimensional cosmology consistently includes electromagnetic waves.

Place, publisher, year, edition, pages
Springer, 2024
Keywords
String and Brane Phenomenology, de Sitter space
National Category
Fusion, Plasma and Space Physics
Identifiers
urn:nbn:se:uu:diva-524616 (URN)10.1007/JHEP02(2024)112 (DOI)001162485900007 ()
Funder
Swedish Research Council, 2022-06157
Available from: 2024-03-11 Created: 2024-03-11 Last updated: 2024-03-11Bibliographically approved
Banerjee, S., Danielsson, U. & Zemsch, M. (2024). The dark bubbleography. Journal of High Energy Physics (JHEP) (2), Article ID 102.
Open this publication in new window or tab >>The dark bubbleography
2024 (English)In: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, no 2, article id 102Article in journal (Refereed) Published
Abstract [en]

We present the holographic construction of the dark bubble model of dark energy and highlight the pivotal role played by the non-normalizable modes. Following the route of holographic renormalization, we show that the non-normalizable modes are essential for having a vanishing mass for the induced graviton in any braneworld model. We then apply this idea in the computation of the propagator on the wall of the dark bubble introduced in [1].

Place, publisher, year, edition, pages
Springer, 2024
Keywords
AdS-CFT Correspondence, Cosmological models, de Sitter space, Extra Dimensions
National Category
Astronomy, Astrophysics and Cosmology Subatomic Physics
Identifiers
urn:nbn:se:uu:diva-524618 (URN)10.1007/JHEP02(2024)102 (DOI)001162485900005 ()
Available from: 2024-03-11 Created: 2024-03-11 Last updated: 2024-03-11Bibliographically approved
Banerjee, S., Danielsson, U. & Giri, S. (2023). Features of a dark energy model in string theory. Physical Review D: covering particles, fields, gravitation, and cosmology, 108(12), Article ID 126009.
Open this publication in new window or tab >>Features of a dark energy model in string theory
2023 (English)In: Physical Review D: covering particles, fields, gravitation, and cosmology, ISSN 2470-0010, E-ISSN 2470-0029, Vol. 108, no 12, article id 126009Article in journal (Refereed) Published
Abstract [en]

In this article we clear up misconceptions concerning the dark bubble model as a realization of dark energy in string theory. In particular we point out important differences with Randall-Sundrum, and explain why gravity neither is, nor need be, localized on the dark bubble.

Place, publisher, year, edition, pages
American Physical Society, 2023
National Category
Other Physics Topics Astronomy, Astrophysics and Cosmology
Identifiers
urn:nbn:se:uu:diva-524321 (URN)10.1103/PhysRevD.108.126009 (DOI)001144882600002 ()
Available from: 2024-03-06 Created: 2024-03-06 Last updated: 2024-03-06Bibliographically approved
Banerjee, S., Danielsson, U. & Giri, S. (2021). Bubble needs strings. Journal of High Energy Physics (JHEP) (3), Article ID 250.
Open this publication in new window or tab >>Bubble needs strings
2021 (English)In: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, no 3, article id 250Article in journal (Refereed) Published
Abstract [en]

In this paper, we want to emphasize the pivotal role played by strings in the model realizing de Sitter using an expanding bubble, proposed and subsequently developed in [1-3]. Contrary to the Randall-Sundrum model of brane-localized gravity, we use the end points of radially stretched strings to obtain matter sourcing gravity induced on the bubble wall. This allows us to reinterpret the possible volume divergence coming from naive dimensional reduction as mass renormalization in four dimensional particle physics. Furthermore, we argue that the residual time dependence in the bulk, pointed out by some recent work as a possible shortcoming of such models, is automatically cured in presence of these stringy sources.

Place, publisher, year, edition, pages
Springer NatureSPRINGER, 2021
Keywords
Phenomenology of Large extra dimensions, Strings and branes phenomenology
National Category
Other Physics Topics Subatomic Physics
Identifiers
urn:nbn:se:uu:diva-442294 (URN)10.1007/JHEP03(2021)250 (DOI)000635241800003 ()
Available from: 2021-05-26 Created: 2021-05-26 Last updated: 2024-01-15Bibliographically approved
Banerjee, S., Danielsson, U. & Giri, S. (2021). Curing with Hemlock: Escaping the swampland using instabilities from string theory. International Journal of Modern Physics D, 30(14), Article ID 2142029.
Open this publication in new window or tab >>Curing with Hemlock: Escaping the swampland using instabilities from string theory
2021 (English)In: International Journal of Modern Physics D, ISSN 0218-2718, Vol. 30, no 14, article id 2142029Article in journal (Refereed) Published
Abstract [en]

In this essay, we will take a wonderful ride on a dark bubble with strings attached, which carries our universe out of the swampland and makes it realizable in the landscape of string theory. To find the way to the landscape, we make use of apparently hostile corners of the swampland and their instabilities.

Place, publisher, year, edition, pages
World ScientificWorld Scientific Pub Co Pte Ltd, 2021
Keywords
de Sitter, swampland, braneworlds, string theory, general relativity
National Category
Other Physics Topics Astronomy, Astrophysics and Cosmology
Identifiers
urn:nbn:se:uu:diva-467418 (URN)10.1142/S0218271821420293 (DOI)000739427800023 ()
Available from: 2022-02-11 Created: 2022-02-11 Last updated: 2024-01-15Bibliographically approved
Banerjee, S., Danielsson, U. & Giri, S. (2021). Dark bubbles and black holes. Journal of High Energy Physics (JHEP) (9), Article ID 158.
Open this publication in new window or tab >>Dark bubbles and black holes
2021 (English)In: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, no 9, article id 158Article in journal (Refereed) Published
Abstract [en]

In this paper we study shells of matter and black holes on the expanding bubbles realizing de Sitter space, that were proposed in [4]. We construct explicit solutions for a rigid shell of matter as well as black hole like solutions. The latter of these can also be used to construct Randall-Sundrum braneworld black holes in four dimensions.

Place, publisher, year, edition, pages
Springer NatureSPRINGER, 2021
Keywords
Phenomenology of Large extra dimensions
National Category
Condensed Matter Physics Astronomy, Astrophysics and Cosmology
Identifiers
urn:nbn:se:uu:diva-457472 (URN)10.1007/JHEP09(2021)158 (DOI)000698952200004 ()
Available from: 2021-11-02 Created: 2021-11-02 Last updated: 2024-01-15Bibliographically approved
Danielsson, U., Lehner, L. & Pretorius, F. (2021). Dynamics and observational signatures of shell-like black hole mimickers. Physical Review D: covering particles, fields, gravitation, and cosmology, 104(12), Article ID 124011.
Open this publication in new window or tab >>Dynamics and observational signatures of shell-like black hole mimickers
2021 (English)In: Physical Review D: covering particles, fields, gravitation, and cosmology, ISSN 2470-0010, E-ISSN 2470-0029, Vol. 104, no 12, article id 124011Article in journal (Refereed) Published
Abstract [en]

We undertake the task of studying the nonlinear dynamics of quantum gravity motivated alternatives to black holes that in the classical limit appear as ultracompact shells of matter. We develop a formalism that should be amenable to numerical solution in generic situations. For a concrete model, we focus on the spherically symmetric anti-de Sitter (AdS) black bubble—a shell of matter at the Buchdahl radius separating a Schwarzschild exterior from an AdS interior. We construct a numerical code to study the radial dynamics of and accretion onto AdS black bubbles, with exterior matter provided by scalar fields. In doing so, we develop numerical methods that could be extended to future studies beyond spherical symmetry. Regarding AdS black bubbles in particular, we find that the original prescription for the internal matter fluxes needed to stabilize the black bubble is inadequate in dynamical settings, and we propose a two-parameter generalization of the flux model to fix this. To allow for more efficient surveys of parameter space, we develop a simpler numerical model adapted to spherically symmetric bubble dynamics. We identify regions of parameter space that do allow for stable black bubbles and moreover allow control to a desired end state after an accretion episode. Based on these results, and evolution of scalar fields on black bubble backgrounds, we speculate on some observational consequences if what are currently presumed to be black holes in the Universe were actually black bubbles.

Place, publisher, year, edition, pages
American Physical SocietyAmerican Physical Society (APS), 2021
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
urn:nbn:se:uu:diva-461723 (URN)10.1103/PhysRevD.104.124011 (DOI)000727716600027 ()
Available from: 2022-02-08 Created: 2022-02-08 Last updated: 2024-01-15Bibliographically approved
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