Pub Date : 2025-01-22DOI: 10.1088/1361-6382/ada90c
Samuel Blitz and Shahn Majid
Understanding the microscopic behavior of spacetime, in particular quantum uncertainty in the Ricci scalar, is critical for developing a theory of quantum gravity and perhaps solving the cosmological constant problem. To test this, we compute this quantity for a simple but exact discrete quantum gravity model based on a single plaquette of spacetime. Our results confirm initial speculations of Wheeler from 1955 in finding a UV divergence in the quantum uncertainty. We further show that this behavior is stable under renormalization, but potentially unstable with the introduction of a cosmological constant, suggesting that a bare cosmological constant is ruled out.
{"title":"Quantum curvature fluctuations and the cosmological constant in a single plaquette quantum gravity model","authors":"Samuel Blitz and Shahn Majid","doi":"10.1088/1361-6382/ada90c","DOIUrl":"https://doi.org/10.1088/1361-6382/ada90c","url":null,"abstract":"Understanding the microscopic behavior of spacetime, in particular quantum uncertainty in the Ricci scalar, is critical for developing a theory of quantum gravity and perhaps solving the cosmological constant problem. To test this, we compute this quantity for a simple but exact discrete quantum gravity model based on a single plaquette of spacetime. Our results confirm initial speculations of Wheeler from 1955 in finding a UV divergence in the quantum uncertainty. We further show that this behavior is stable under renormalization, but potentially unstable with the introduction of a cosmological constant, suggesting that a bare cosmological constant is ruled out.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"18 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-01-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142992014","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-22DOI: 10.1088/1361-6382/ada714
David Sloan
In previous work I have shown that Herglotz actions reproduce the dynamics of classical mechanical theories which exhibit dynamical similarities. Recent work has shown how to extend field theories in both the Lagrangian and de Donder-Weyl formalism to contact geometry (Gaset et al 2020 Ann. Phys., NY414 168092; 2021 Rep. Math. Phys.87 347–68; 2022 arXiv:2211.17058). In this article I show how dynamical similarity applies in field theory. This is applied in both the Lagrangian and Hamiltonian frameworks, producing the contact equivalents. The result can be applied to general relativity where I demonstrate how to construct a complete description of the dynamics, equivalent to those derived from the Einstein–Hilbert action, without reference to the conformal factor.
在以前的工作中，我已经表明，赫格洛茨动作再现了经典力学理论的动力学，这些力学理论表现出动力学相似性。最近的工作展示了如何将拉格朗日和德·多德-魏尔形式论中的场论扩展到接触几何（Gaset et al . 2020）。理论物理。， ny414 168092；2021众议员数学。Phys.87 347 - 68;2022 arXiv: 2211.17058)。在这篇文章中，我将展示动力学相似性在场论中的应用。这适用于拉格朗日和哈密顿框架，产生接触当量。这个结果可以应用于广义相对论，在广义相对论中，我演示了如何构建一个完整的动力学描述，等同于那些从爱因斯坦-希尔伯特作用中推导出来的动力学描述，而不涉及保形因子。
{"title":"Dynamical similarity in field theories","authors":"David Sloan","doi":"10.1088/1361-6382/ada714","DOIUrl":"https://doi.org/10.1088/1361-6382/ada714","url":null,"abstract":"In previous work I have shown that Herglotz actions reproduce the dynamics of classical mechanical theories which exhibit dynamical similarities. Recent work has shown how to extend field theories in both the Lagrangian and de Donder-Weyl formalism to contact geometry (Gaset et al 2020 Ann. Phys., NY414 168092; 2021 Rep. Math. Phys.87 347–68; 2022 arXiv:2211.17058). In this article I show how dynamical similarity applies in field theory. This is applied in both the Lagrangian and Hamiltonian frameworks, producing the contact equivalents. The result can be applied to general relativity where I demonstrate how to construct a complete description of the dynamics, equivalent to those derived from the Einstein–Hilbert action, without reference to the conformal factor.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"105 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-01-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142992013","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-20DOI: 10.1088/1361-6382/ada2d7
Batoul Banihashemi, Edgar Shaghoulian and Sanjit Shashi
We study the thermodynamics of Einstein gravity with vanishing cosmological constant subjected to conformal boundary conditions. Our focus is on comparing the series of subextensive terms to predictions from thermal effective field theory, with which we find agreement for the boundary theory on a spatial sphere, hyperbolic space, and flat space. We calculate the leading Wilson coefficients and observe that the first subextensive correction to the free energy is negative. This violates a conjectured bound on this coefficient in quantum field theory, which we interpret as a signal that gravity does not fully decouple in the putative boundary dual.
{"title":"Flat space gravity at finite cutoff","authors":"Batoul Banihashemi, Edgar Shaghoulian and Sanjit Shashi","doi":"10.1088/1361-6382/ada2d7","DOIUrl":"https://doi.org/10.1088/1361-6382/ada2d7","url":null,"abstract":"We study the thermodynamics of Einstein gravity with vanishing cosmological constant subjected to conformal boundary conditions. Our focus is on comparing the series of subextensive terms to predictions from thermal effective field theory, with which we find agreement for the boundary theory on a spatial sphere, hyperbolic space, and flat space. We calculate the leading Wilson coefficients and observe that the first subextensive correction to the free energy is negative. This violates a conjectured bound on this coefficient in quantum field theory, which we interpret as a signal that gravity does not fully decouple in the putative boundary dual.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"56 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142990010","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-20DOI: 10.1088/1361-6382/ada245
Michael Blanc, Philippe Jetzer and Shubhanshu Tiwari
The present cosmological model and the surveys favor the Universe with a small but positive cosmological constant Λ, which accounts for dark energy and causes an exponential expansion. This can have observational consequences in the current detection of gravitational waves, as most of the waveforms for gravitational radiation are computed assuming a flat (Minkowski) background. In this work, we compute gravitational radiation within the quadrupole approximation on a positive Λ (de Sitter) background for a binary system interacting gravitationally through a hyperbolic encounter. We quantify the influence of the cosmological constant on the radiated energy as small corrections to the leading order Minkowski background results. The first order de Sitter background correction is of the order , and is thus extremely small. Therefore, the cosmological constant influence on the gravitational radiation is negligible and may not be detected with the existing or planned gravitational wave detectors.
{"title":"Quadrupolar power radiation by a binary system in a hyperbolic encounter on de Sitter background","authors":"Michael Blanc, Philippe Jetzer and Shubhanshu Tiwari","doi":"10.1088/1361-6382/ada245","DOIUrl":"https://doi.org/10.1088/1361-6382/ada245","url":null,"abstract":"The present cosmological model and the surveys favor the Universe with a small but positive cosmological constant Λ, which accounts for dark energy and causes an exponential expansion. This can have observational consequences in the current detection of gravitational waves, as most of the waveforms for gravitational radiation are computed assuming a flat (Minkowski) background. In this work, we compute gravitational radiation within the quadrupole approximation on a positive Λ (de Sitter) background for a binary system interacting gravitationally through a hyperbolic encounter. We quantify the influence of the cosmological constant on the radiated energy as small corrections to the leading order Minkowski background results. The first order de Sitter background correction is of the order , and is thus extremely small. Therefore, the cosmological constant influence on the gravitational radiation is negligible and may not be detected with the existing or planned gravitational wave detectors.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"37 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142990263","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-17DOI: 10.1088/1361-6382/ada513
Andrzej Borowiec, Jerzy Kowalski-Glikman and Tomasz Trześniewski
In this paper, we find a class of Carrollian and Galilean contractions of (extended) Bondi–van der Burg–Metzner–Sachs (BMS) algebra in 3+1 and 2+1 dimensions. To this end, we investigate possible embeddings of 3D/4D Poincaré into the BMS and BMS algebras, respectively. The contraction limits in the 2+1-dimensional case are then enforced by appropriate contractions of its Poincaré subalgebras. In 3+1 dimensions, we have to apply instead the analogy between the structures of Poincaré and BMS algebra. In the case of non-vanishing cosmological constant in 2+1 dimensions, we consider the contractions of Λ-BMS algebra in an analogous manner. As a by-product, we have also analyzed reality conditions on the Witt algebra and obtained new results.
本文研究了3+1和2+1维Bondi-van der Burg-Metzner-Sachs （BMS）代数的（扩展）Carrollian和Galilean压缩。为此，我们分别研究了3D/4D poincarcarve嵌入BMS和BMS代数的可能性。在2+1维情况下，通过对其poincarcars子代数进行适当的压缩来实现收缩极限。在3+1维中，我们必须应用poincarcarve和BMS代数结构之间的类比。在2+1维宇宙常数不消失的情况下，我们以类似的方式考虑Λ-BMS代数的收缩。作为副产物，我们还分析了Witt代数的现实条件，得到了新的结果。
{"title":"On Carrollian and Galilean contractions of BMS algebra in 3 and 4 dimensions","authors":"Andrzej Borowiec, Jerzy Kowalski-Glikman and Tomasz Trześniewski","doi":"10.1088/1361-6382/ada513","DOIUrl":"https://doi.org/10.1088/1361-6382/ada513","url":null,"abstract":"In this paper, we find a class of Carrollian and Galilean contractions of (extended) Bondi–van der Burg–Metzner–Sachs (BMS) algebra in 3+1 and 2+1 dimensions. To this end, we investigate possible embeddings of 3D/4D Poincaré into the BMS and BMS algebras, respectively. The contraction limits in the 2+1-dimensional case are then enforced by appropriate contractions of its Poincaré subalgebras. In 3+1 dimensions, we have to apply instead the analogy between the structures of Poincaré and BMS algebra. In the case of non-vanishing cosmological constant in 2+1 dimensions, we consider the contractions of Λ-BMS algebra in an analogous manner. As a by-product, we have also analyzed reality conditions on the Witt algebra and obtained new results.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"54 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142987321","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-17DOI: 10.1088/1361-6382/ada244
D I Jones and K Riles
Rotating and oscillating neutron stars can give rise to long-lived Continuous Gravitational Waves (CGWs). Despite many years of searching, the detection of such a CGW signal remains elusive. In this article we describe the main astrophysical uncertainties regarding such emission, and their relation to the behaviour of matter at extremely high density. We describe the main challenges in searching for CGWs, and the prospects of detecting them using third-generation gravitational wave detectors. We end by describing some pressing issues in the field, whose resolution would help turn the detection and exploitation of CGWs into reality.
{"title":"Multimessenger observations and the science enabled: continuous waves and their progenitors, equation of state of dense matter","authors":"D I Jones and K Riles","doi":"10.1088/1361-6382/ada244","DOIUrl":"https://doi.org/10.1088/1361-6382/ada244","url":null,"abstract":"Rotating and oscillating neutron stars can give rise to long-lived Continuous Gravitational Waves (CGWs). Despite many years of searching, the detection of such a CGW signal remains elusive. In this article we describe the main astrophysical uncertainties regarding such emission, and their relation to the behaviour of matter at extremely high density. We describe the main challenges in searching for CGWs, and the prospects of detecting them using third-generation gravitational wave detectors. We end by describing some pressing issues in the field, whose resolution would help turn the detection and exploitation of CGWs into reality.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"24 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142987320","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-17DOI: 10.1088/1361-6382/ad605a
R Alves Batista, G Amelino-Camelia, D Boncioli, J M Carmona, A di Matteo, G Gubitosi, I Lobo, N E Mavromatos, C Pfeifer, D Rubiera-Garcia, E N Saridakis, T Terzić, E C Vagenas, P Vargas Moniz, H Abdalla, M Adamo, A Addazi, F K Anagnostopoulos, V Antonelli, M Asorey, A Ballesteros, S Basilakos, D Benisty, M Boettcher, J Bolmont, A Bonilla, P Bosso, M Bouhmadi-López, L Burderi, A Campoy-Ordaz, S Caroff, S Cerci, J L Cortes, V D’Esposito, S Das, M de Cesare, M Demirci, F Di Lodovico, T Di Salvo, J M Diego, G S Djordjevic, A Domi, L Ducobu, C Escamilla-Rivera, G Fabiano, D Fernández-Silvestre, S A Franchino-Viñas, A M Frassino, D Frattulillo, M Gaug, L Á Gergely, E I Guendelman, D Guetta, I Gutierrez-Sagredo, P He, S Heefer, T Jurić, T Katori, J Kowalski-Glikman, G Lambiase, J Levi Said, C Li, H Li, G G Luciano, B-Q Ma, A Marciano, M Martinez, A Mazumdar, G Menezes, F Mercati, D Minic, L Miramonti, V A Mitsou, M F Mustamin, S Navas, G J Olmo, D Oriti, A Övgün, R C Pantig, A Parvi..
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.
{"title":"White paper and roadmap for quantum gravity phenomenology in the multi-messenger era","authors":"R Alves Batista, G Amelino-Camelia, D Boncioli, J M Carmona, A di Matteo, G Gubitosi, I Lobo, N E Mavromatos, C Pfeifer, D Rubiera-Garcia, E N Saridakis, T Terzić, E C Vagenas, P Vargas Moniz, H Abdalla, M Adamo, A Addazi, F K Anagnostopoulos, V Antonelli, M Asorey, A Ballesteros, S Basilakos, D Benisty, M Boettcher, J Bolmont, A Bonilla, P Bosso, M Bouhmadi-López, L Burderi, A Campoy-Ordaz, S Caroff, S Cerci, J L Cortes, V D’Esposito, S Das, M de Cesare, M Demirci, F Di Lodovico, T Di Salvo, J M Diego, G S Djordjevic, A Domi, L Ducobu, C Escamilla-Rivera, G Fabiano, D Fernández-Silvestre, S A Franchino-Viñas, A M Frassino, D Frattulillo, M Gaug, L Á Gergely, E I Guendelman, D Guetta, I Gutierrez-Sagredo, P He, S Heefer, T Jurić, T Katori, J Kowalski-Glikman, G Lambiase, J Levi Said, C Li, H Li, G G Luciano, B-Q Ma, A Marciano, M Martinez, A Mazumdar, G Menezes, F Mercati, D Minic, L Miramonti, V A Mitsou, M F Mustamin, S Navas, G J Olmo, D Oriti, A Övgün, R C Pantig, A Parvi..","doi":"10.1088/1361-6382/ad605a","DOIUrl":"https://doi.org/10.1088/1361-6382/ad605a","url":null,"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.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"49 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142987252","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-13DOI: 10.1088/1361-6382/ada2d4
Johanna Borissova, Astrid Eichhorn and Shouryya Ray
The no-global-symmetries conjecture is central to the swampland program that delineates the boundary between effective field theories that can be obtained from a quantum theory of gravity to those that cannot. The conjecture states that virtual black-hole configurations in the path integral generate terms that violate all global symmetries in the effective action for matter. Because of its central role, it is crucial to understand limitations to the validity of this conjecture. In the context of the Lorentzian path integral over spacetime geometries, we explore whether virtual black-hole configurations can be suppressed dynamically. To that end, we work in a spherically symmetric setting and make use of horizon-detecting curvature invariants which vanish on the horizon. By constructing a non-local gravitational action from the inverse of such curvature invariants, we can achieve destructive interference of black-hole configurations in the path integral. Given that non-local gravitational actions appear generically as the result of integrating out matter degrees of freedom from a theory for quantum gravity and matter, our exemplary construction reinforces discussions about the role of non-locality in assessing arguably universal properties of quantum gravity within the framework of path integrals.
{"title":"A non-local way around the no-global-symmetries conjecture in quantum gravity?","authors":"Johanna Borissova, Astrid Eichhorn and Shouryya Ray","doi":"10.1088/1361-6382/ada2d4","DOIUrl":"https://doi.org/10.1088/1361-6382/ada2d4","url":null,"abstract":"The no-global-symmetries conjecture is central to the swampland program that delineates the boundary between effective field theories that can be obtained from a quantum theory of gravity to those that cannot. The conjecture states that virtual black-hole configurations in the path integral generate terms that violate all global symmetries in the effective action for matter. Because of its central role, it is crucial to understand limitations to the validity of this conjecture. In the context of the Lorentzian path integral over spacetime geometries, we explore whether virtual black-hole configurations can be suppressed dynamically. To that end, we work in a spherically symmetric setting and make use of horizon-detecting curvature invariants which vanish on the horizon. By constructing a non-local gravitational action from the inverse of such curvature invariants, we can achieve destructive interference of black-hole configurations in the path integral. Given that non-local gravitational actions appear generically as the result of integrating out matter degrees of freedom from a theory for quantum gravity and matter, our exemplary construction reinforces discussions about the role of non-locality in assessing arguably universal properties of quantum gravity within the framework of path integrals.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"36 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-01-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142968246","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-13DOI: 10.1088/1361-6382/ad9f13
Kylan Jersey, Harold Hollis, Han-Yu Chia, Jose Sanjuan, Paul Fulda, Guido Mueller and Felipe Guzman
The optical truss interferometer (OTI) is a contingent subsystem proposed for the LISA telescopes to aid in the verification of a optical path length stability. Each telescope would be equipped with three pairs of compact fiber-coupled units, each forming an optical cavity with a baseline proportional to the telescope length at different points around the aperture. Employing a Pound–Drever–Hall approach to maintain a modulated laser field on resonance with each cavity, the dimensional stability of the telescope can be measured and verified. We have designed and developed prototype OTI units to demonstrate the capability of measuring stable structures, such as the LISA telescope, with a sensitivity using a set of freely mountable fiber-injected cavities. Aside from its initial motivation for the telescope, the OTI can also be readily integrated with other systems to aid in ground testing experiments. In this paper, we outline our experimental setup, measurement results, and analyses of the noise limitations.
{"title":"Picometer sensitive prototype of the optical truss interferometer for LISA","authors":"Kylan Jersey, Harold Hollis, Han-Yu Chia, Jose Sanjuan, Paul Fulda, Guido Mueller and Felipe Guzman","doi":"10.1088/1361-6382/ad9f13","DOIUrl":"https://doi.org/10.1088/1361-6382/ad9f13","url":null,"abstract":"The optical truss interferometer (OTI) is a contingent subsystem proposed for the LISA telescopes to aid in the verification of a optical path length stability. Each telescope would be equipped with three pairs of compact fiber-coupled units, each forming an optical cavity with a baseline proportional to the telescope length at different points around the aperture. Employing a Pound–Drever–Hall approach to maintain a modulated laser field on resonance with each cavity, the dimensional stability of the telescope can be measured and verified. We have designed and developed prototype OTI units to demonstrate the capability of measuring stable structures, such as the LISA telescope, with a sensitivity using a set of freely mountable fiber-injected cavities. Aside from its initial motivation for the telescope, the OTI can also be readily integrated with other systems to aid in ground testing experiments. In this paper, we outline our experimental setup, measurement results, and analyses of the noise limitations.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"11 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-01-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142968245","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-10DOI: 10.1088/1361-6382/ad9e67
Kaloian D Lozanov, Shi Pi, Misao Sasaki, Volodymyr Takhistov and Ao Wang
Formation of cosmological solitons is generically accompanied by production of gravitational waves (GWs), with a universal GW background expected at frequency scales below that of non-linear dynamics. Beginning with a general phenomenological description of GWs associated with soliton formation, we demonstrate that universal GW background from axion-like particle solitonic oscillons provides a viable interpretation to the recent NANOGrav 15 year pulsar timing array (PTA) data, which does not suffer from the overproduction of primordial black holes. We show that PTA data displays preference for models where formed solitons do not strongly interact or cluster. Coincidence observations with Nancy Roman telescope will allow to discriminate between distinct scenarios of cosmological solitons.
{"title":"Axion-like universal gravitational wave interpretation of pulsar timing array data","authors":"Kaloian D Lozanov, Shi Pi, Misao Sasaki, Volodymyr Takhistov and Ao Wang","doi":"10.1088/1361-6382/ad9e67","DOIUrl":"https://doi.org/10.1088/1361-6382/ad9e67","url":null,"abstract":"Formation of cosmological solitons is generically accompanied by production of gravitational waves (GWs), with a universal GW background expected at frequency scales below that of non-linear dynamics. Beginning with a general phenomenological description of GWs associated with soliton formation, we demonstrate that universal GW background from axion-like particle solitonic oscillons provides a viable interpretation to the recent NANOGrav 15 year pulsar timing array (PTA) data, which does not suffer from the overproduction of primordial black holes. We show that PTA data displays preference for models where formed solitons do not strongly interact or cluster. Coincidence observations with Nancy Roman telescope will allow to discriminate between distinct scenarios of cosmological solitons.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"67 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142939951","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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