Pub Date : 2025-12-23DOI: 10.1088/1361-6382/ae2731
Simon C Tait, Michael J Williams, Joseph Bayley, Bryan W Barr and Iain Martin
Gravitational-wave detectors, such as LIGO, are predominantly limited by coating Brownian thermal noise (CTN), which arises from mechanical losses in the Bragg mirror coatings of test-mass optics. Accurately characterising and minimising these losses is crucial for enhancing detector sensitivity. This paper introduces a Bayesian framework for precisely analysing mechanical ring-down measurements of disk resonators, a standard method for quantifying mechanical loss in coating materials. Our approach incorporates an improved model that captures the non-linear behaviour of beam spot motion on split photodiode sensors, significantly improving upon traditional simplified exponential-decay methods, and models the non-stationary noise present in the data. We perform analyses using nested sampling and show, using Bayesian model comparison, that our improved model is strongly preferred over the existing model. We obtain more accurate estimates of the decay constants (τ1 and τ2), particularly for measurements with large oscillation amplitudes and for signals dominated by a single decay mode. This leads to improved accuracy in the measured losses: the uncertainty decreases by a factor of 2.9 for and 3.8 for , whilst the median change in the inferred values is less than 3% for both losses. Our method can also reliably analyze measurements that were previously discarded due to fitting errors, recovering 15% more usable measurements from our dataset, and can robustly characterise measurements where only a single decay is measured. This enhanced analytical capability yields more precise and reliable loss estimates from disk resonator data and provides a diagnostic tool for systematic errors, thereby supporting efforts to reduce coating thermal noise and improve gravitational-wave detector sensitivity.
{"title":"Use of Bayesian inference to diagnose issues in experimental measurements of mechanical disk resonators","authors":"Simon C Tait, Michael J Williams, Joseph Bayley, Bryan W Barr and Iain Martin","doi":"10.1088/1361-6382/ae2731","DOIUrl":"https://doi.org/10.1088/1361-6382/ae2731","url":null,"abstract":"Gravitational-wave detectors, such as LIGO, are predominantly limited by coating Brownian thermal noise (CTN), which arises from mechanical losses in the Bragg mirror coatings of test-mass optics. Accurately characterising and minimising these losses is crucial for enhancing detector sensitivity. This paper introduces a Bayesian framework for precisely analysing mechanical ring-down measurements of disk resonators, a standard method for quantifying mechanical loss in coating materials. Our approach incorporates an improved model that captures the non-linear behaviour of beam spot motion on split photodiode sensors, significantly improving upon traditional simplified exponential-decay methods, and models the non-stationary noise present in the data. We perform analyses using nested sampling and show, using Bayesian model comparison, that our improved model is strongly preferred over the existing model. We obtain more accurate estimates of the decay constants (τ1 and τ2), particularly for measurements with large oscillation amplitudes and for signals dominated by a single decay mode. This leads to improved accuracy in the measured losses: the uncertainty decreases by a factor of 2.9 for and 3.8 for , whilst the median change in the inferred values is less than 3% for both losses. Our method can also reliably analyze measurements that were previously discarded due to fitting errors, recovering 15% more usable measurements from our dataset, and can robustly characterise measurements where only a single decay is measured. This enhanced analytical capability yields more precise and reliable loss estimates from disk resonator data and provides a diagnostic tool for systematic errors, thereby supporting efforts to reduce coating thermal noise and improve gravitational-wave detector sensitivity.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"1 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145813023","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 : 2025-12-23DOI: 10.1088/1361-6382/ae2411
D F López, A A Coley and R J van den Hoogen
New general relativity (NGR) is a class of teleparallel theories defined by three free parameters, effectively reduced to two after appropriate normalization, which are subject to experimental constraints. In this framework, matter couples minimally to the metric, ensuring that test particles follow geodesics and that null congruence expansions can be employed to detect local horizons. Assuming such horizons exist, we demonstrate that all physically viable NGR models, including the teleparallel equivalent of general Relativity and the one-parameter Hayashi and Shirafuji model, inevitably exhibit divergences in torsion scalars at the local horizon. This singular behavior obstructs the interpretation of these models and their associated teleparallel geometries as black hole configurations.
{"title":"On black holes in new general relativity","authors":"D F López, A A Coley and R J van den Hoogen","doi":"10.1088/1361-6382/ae2411","DOIUrl":"https://doi.org/10.1088/1361-6382/ae2411","url":null,"abstract":"New general relativity (NGR) is a class of teleparallel theories defined by three free parameters, effectively reduced to two after appropriate normalization, which are subject to experimental constraints. In this framework, matter couples minimally to the metric, ensuring that test particles follow geodesics and that null congruence expansions can be employed to detect local horizons. Assuming such horizons exist, we demonstrate that all physically viable NGR models, including the teleparallel equivalent of general Relativity and the one-parameter Hayashi and Shirafuji model, inevitably exhibit divergences in torsion scalars at the local horizon. This singular behavior obstructs the interpretation of these models and their associated teleparallel geometries as black hole configurations.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"26 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145813021","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 : 2025-12-22DOI: 10.1088/1361-6382/ae2413
Bernard J Kelly, Sarah Gossan, Leonardo R Werneck, John Wise, Zachariah B Etienne, Thiago Assumpção, Aláine Lee and John G Baker
Direct-collapse black holes (DCBHs) are an important component of the massive BH population of the early Universe, and their formation and early mergers will be prominent in the data stream of the Laser Interferometer Space Antenna. However, the population and binary properties of these early BHs are poorly understood, with masses, mass ratios, spins, and orbital eccentricities strongly dependent on the details of their formation, and the properties of the remaining exterior material (baryonic and non-baryonic), which may be substantial to the point of merger. We report on initial work to simulate the formation, collapse, and/or merger of such DCBH regions in order to extract the resulting gravitational-wave signals.
直接坍缩黑洞（Direct-collapse black holes, DCBHs）是早期宇宙大质量黑洞群的重要组成部分，它们的形成和早期合并将成为激光干涉仪空间天线数据流中的重要内容。然而，人们对这些早期黑洞的总体和双星性质知之甚少，质量、质量比、自旋和轨道偏心性强烈依赖于它们形成的细节，以及剩余的外部物质（重子和非重子）的性质，这些物质可能对合并点很重要。我们报告了模拟这些DCBH区域的形成、坍缩和/或合并的初步工作，以提取由此产生的引力波信号。
{"title":"Gravitational-wave signatures of massive black hole formation","authors":"Bernard J Kelly, Sarah Gossan, Leonardo R Werneck, John Wise, Zachariah B Etienne, Thiago Assumpção, Aláine Lee and John G Baker","doi":"10.1088/1361-6382/ae2413","DOIUrl":"https://doi.org/10.1088/1361-6382/ae2413","url":null,"abstract":"Direct-collapse black holes (DCBHs) are an important component of the massive BH population of the early Universe, and their formation and early mergers will be prominent in the data stream of the Laser Interferometer Space Antenna. However, the population and binary properties of these early BHs are poorly understood, with masses, mass ratios, spins, and orbital eccentricities strongly dependent on the details of their formation, and the properties of the remaining exterior material (baryonic and non-baryonic), which may be substantial to the point of merger. We report on initial work to simulate the formation, collapse, and/or merger of such DCBH regions in order to extract the resulting gravitational-wave signals.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"22 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145801391","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 : 2025-12-22DOI: 10.1088/1361-6382/ae29dc
Andronikos Paliathanasis
We investigate hidden symmetries in a minimally coupled scalar field cosmology within the Friedmann–Lemaître–Robertson–Walker Universe, considering a perfect fluid both with and without interaction with the scalar field. We show that, for an exponential potential, there exists a set of canonical transformations through which the cosmological field equations can be recast as those of a free particle in flat space. Based on this equivalence, we construct a mapping that generates cosmological solutions with interaction terms, corresponding to a chameleon mechanism. Finally, we discuss how this class of canonical transformations can relate the solution spaces of different cosmological models, such as those of the scalar field and of the Λ-cosmology.
{"title":"Canonical structure and hidden symmetries in scalar field cosmology","authors":"Andronikos Paliathanasis","doi":"10.1088/1361-6382/ae29dc","DOIUrl":"https://doi.org/10.1088/1361-6382/ae29dc","url":null,"abstract":"We investigate hidden symmetries in a minimally coupled scalar field cosmology within the Friedmann–Lemaître–Robertson–Walker Universe, considering a perfect fluid both with and without interaction with the scalar field. We show that, for an exponential potential, there exists a set of canonical transformations through which the cosmological field equations can be recast as those of a free particle in flat space. Based on this equivalence, we construct a mapping that generates cosmological solutions with interaction terms, corresponding to a chameleon mechanism. Finally, we discuss how this class of canonical transformations can relate the solution spaces of different cosmological models, such as those of the scalar field and of the Λ-cosmology.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"45 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145801409","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 : 2025-12-18DOI: 10.1088/1361-6382/ae2735
Juliano C S Neves
The Deser–Woodard gravity is a modified theory of gravity in which nonlocality plays a central role. In this context, nonlocality is a consequence of the inverse of the d’Alembertian operator in the effective action. Here, exact black hole and wormhole solutions are built in the revised Deser–Woodard gravity following a recent approach, where a special tetrad frame simplifies the complicated field equations of the theory. Using the Schwarzschild metric and the Reissner–Nordström metric as initial seed solutions, the developed algorithm generates new traversable wormholes, singular black holes and a regular black hole as solutions of the vacuum field equations of the modified theory. Also, the auxiliary fields, which are responsible for the nonlocality, are computed. However, even for a regular black hole solution, in which spacetime does not contain a curvature singularity, the corresponding auxiliary fields diverge at the event horizon. Regarding observational results, the shadow angular radius is computed for the new solutions. In particular, the deviation of the Schwarzschild black hole in the Deser–Woodard gravity casts a larger shadow than the corresponding black hole in general relativity.
{"title":"Black holes and wormholes in Deser–Woodard gravity","authors":"Juliano C S Neves","doi":"10.1088/1361-6382/ae2735","DOIUrl":"https://doi.org/10.1088/1361-6382/ae2735","url":null,"abstract":"The Deser–Woodard gravity is a modified theory of gravity in which nonlocality plays a central role. In this context, nonlocality is a consequence of the inverse of the d’Alembertian operator in the effective action. Here, exact black hole and wormhole solutions are built in the revised Deser–Woodard gravity following a recent approach, where a special tetrad frame simplifies the complicated field equations of the theory. Using the Schwarzschild metric and the Reissner–Nordström metric as initial seed solutions, the developed algorithm generates new traversable wormholes, singular black holes and a regular black hole as solutions of the vacuum field equations of the modified theory. Also, the auxiliary fields, which are responsible for the nonlocality, are computed. However, even for a regular black hole solution, in which spacetime does not contain a curvature singularity, the corresponding auxiliary fields diverge at the event horizon. Regarding observational results, the shadow angular radius is computed for the new solutions. In particular, the deviation of the Schwarzschild black hole in the Deser–Woodard gravity casts a larger shadow than the corresponding black hole in general relativity.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"6 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145771424","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 : 2025-12-18DOI: 10.1088/1361-6382/ae2736
E Minguzzi
The properties of the stable distance over stable spacetimes are used as a reference to propose a simplified, abstract notion of spacetime. Our analysis establishes that the fundamental structures of spacetime, namely its topology, causal order, and (upper semi-continuous) Lorentzian distance, can be derived from a general and minimalistic set of axioms. Specifically, it is shown that spacetime can be represented as nothing more than a family of functions defined over an arbitrary set, the functions being a posteriori interpreted as rushing time functions. The proof makes use of the product trick which reduces causality and metricity to causality in a space with one additional dimension, so leading to a unification for the notions of time function and proper time. Ultimately, our results show that time fully characterizes spacetime.
{"title":"The representation of spacetime through time functions","authors":"E Minguzzi","doi":"10.1088/1361-6382/ae2736","DOIUrl":"https://doi.org/10.1088/1361-6382/ae2736","url":null,"abstract":"The properties of the stable distance over stable spacetimes are used as a reference to propose a simplified, abstract notion of spacetime. Our analysis establishes that the fundamental structures of spacetime, namely its topology, causal order, and (upper semi-continuous) Lorentzian distance, can be derived from a general and minimalistic set of axioms. Specifically, it is shown that spacetime can be represented as nothing more than a family of functions defined over an arbitrary set, the functions being a posteriori interpreted as rushing time functions. The proof makes use of the product trick which reduces causality and metricity to causality in a space with one additional dimension, so leading to a unification for the notions of time function and proper time. Ultimately, our results show that time fully characterizes spacetime.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"27 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145771425","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 : 2025-12-18DOI: 10.1088/1361-6382/ae272f
Tahereh Azizi and Mojtaba Alimoradi
We study a thick brane scenario within the Palatini formulation of gravity, where the metric and affine connection are treated as independent variables. By introducing a non-minimal coupling between a bulk scalar field and the Ricci scalar, we obtain analytic solutions under a flat, four-dimensional Poincaré-invariant metric with a kink-like scalar configuration. The warp factor exhibits a bell-shaped profile, while the scalar potential forms a symmetric volcano-like structure, characteristic of a finite-thickness brane. The corresponding energy density is regular and localized, featuring a central peak with symmetrically placed negative minima. Through the analysis of linear tensor perturbations, we derive a Schrödinger-like equation with supersymmetric factorization, ensuring the absence of tachyonic modes and thus the stability of the background configuration. The effective potential also takes a volcano-like form that supports a localized graviton zero mode, confirming the recovery of four-dimensional gravity on the brane. A numerical study of the massive Kaluza–Klein spectrum reveals the progressive delocalization of massive modes into the bulk. Our results demonstrate a stable and physically consistent thick brane configuration within the Palatini gravity framework, offering new insights into gravity localization and braneworld phenomenology.
{"title":"Thick brane in Palatini formalism with a non-minimally coupled bulk scalar field","authors":"Tahereh Azizi and Mojtaba Alimoradi","doi":"10.1088/1361-6382/ae272f","DOIUrl":"https://doi.org/10.1088/1361-6382/ae272f","url":null,"abstract":"We study a thick brane scenario within the Palatini formulation of gravity, where the metric and affine connection are treated as independent variables. By introducing a non-minimal coupling between a bulk scalar field and the Ricci scalar, we obtain analytic solutions under a flat, four-dimensional Poincaré-invariant metric with a kink-like scalar configuration. The warp factor exhibits a bell-shaped profile, while the scalar potential forms a symmetric volcano-like structure, characteristic of a finite-thickness brane. The corresponding energy density is regular and localized, featuring a central peak with symmetrically placed negative minima. Through the analysis of linear tensor perturbations, we derive a Schrödinger-like equation with supersymmetric factorization, ensuring the absence of tachyonic modes and thus the stability of the background configuration. The effective potential also takes a volcano-like form that supports a localized graviton zero mode, confirming the recovery of four-dimensional gravity on the brane. A numerical study of the massive Kaluza–Klein spectrum reveals the progressive delocalization of massive modes into the bulk. Our results demonstrate a stable and physically consistent thick brane configuration within the Palatini gravity framework, offering new insights into gravity localization and braneworld phenomenology.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"23 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145771422","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 : 2025-12-18DOI: 10.1088/1361-6382/ae2733
Guan-Yu Wu, Si-Yu Wang and Yan-Gang Miao
Phantom scalar fields, as a viable candidate for dark energy, have been instrumental in eliminating spacetime singularities and constructing wormholes and regular black holes. We investigate the Einstein–Maxwell–phantom (EMP) framework, in which the Ellis–Bronnikov wormholes can be charged and regular black holes can be admitted. While the previous study has shown the stability of EMP wormholes under massless scalar field perturbations, we further perform a comprehensive linear analysis of the EMP spacetime through gravito-electromagnetic field perturbations in the axial sector and phantom scalar field perturbations under an approximate treatment in the polar sector. Our analyses of effective potentials and finite difference time profiles reveal the linear instability of EMP wormholes. In the black hole scenario, the quasinormal spectra of Type I black holes, where the matrix-valued direct integration method and the Prony method are used, recover those of general relativity (GR) when the scalar charge goes to zero. Finally, by introducing the concepts of generalized specific charge and mixing angle, we quantify how the relative contributions between the phantom scalar and the electromagnetic fields modify the quasinormal spectra, and we assess the prospects for detecting spectral deviations between the EMP theory and GR in gravitational wave observation.
{"title":"Perturbations of Einstein–Maxwell–phantom spacetime: instabilities of charged Ellis–Bronnikov wormholes and quasinormal modes of black holes","authors":"Guan-Yu Wu, Si-Yu Wang and Yan-Gang Miao","doi":"10.1088/1361-6382/ae2733","DOIUrl":"https://doi.org/10.1088/1361-6382/ae2733","url":null,"abstract":"Phantom scalar fields, as a viable candidate for dark energy, have been instrumental in eliminating spacetime singularities and constructing wormholes and regular black holes. We investigate the Einstein–Maxwell–phantom (EMP) framework, in which the Ellis–Bronnikov wormholes can be charged and regular black holes can be admitted. While the previous study has shown the stability of EMP wormholes under massless scalar field perturbations, we further perform a comprehensive linear analysis of the EMP spacetime through gravito-electromagnetic field perturbations in the axial sector and phantom scalar field perturbations under an approximate treatment in the polar sector. Our analyses of effective potentials and finite difference time profiles reveal the linear instability of EMP wormholes. In the black hole scenario, the quasinormal spectra of Type I black holes, where the matrix-valued direct integration method and the Prony method are used, recover those of general relativity (GR) when the scalar charge goes to zero. Finally, by introducing the concepts of generalized specific charge and mixing angle, we quantify how the relative contributions between the phantom scalar and the electromagnetic fields modify the quasinormal spectra, and we assess the prospects for detecting spectral deviations between the EMP theory and GR in gravitational wave observation.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"5 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145771423","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 : 2025-12-18DOI: 10.1088/1361-6382/ae28ac
Juan Wang, Keqi Qi, Heshan Liu, Pan Li, Ruihong Gao, Shaoxin Wang and Ziren Luo
This paper presents an integrated fiber phase modulation device (FPMD) to suppress front-end optical path difference (OPD) noise in heterodyne interferometry systems, particularly addressing noise induced by acoustic-optic modulator sideband coupling. To achieve real-time optical path stabilization, the FPMD employs a polarization-maintaining fiber coupled with piezoelectric ceramics in a monolithic aluminum structure. The compact, all-fiber design offers enhanced immunity to environmental disturbances while simplifying integration into precision interferometric systems. Through systematic characterization, the FPMD exhibits a highly linear response ( nm V−1, R2 = 0.99914) and effective noise suppression in the critical sub-10 mHz frequency band, achieving picometer-level ranging accuracy across the entire frequency band above 2 mHz. This work provides a theoretical framework and experimental validation for a robust solution to OPD noise in ultra-high-precision metrology applications.
{"title":"An integrated fiber phase modulation device for optical path noise suppression","authors":"Juan Wang, Keqi Qi, Heshan Liu, Pan Li, Ruihong Gao, Shaoxin Wang and Ziren Luo","doi":"10.1088/1361-6382/ae28ac","DOIUrl":"https://doi.org/10.1088/1361-6382/ae28ac","url":null,"abstract":"This paper presents an integrated fiber phase modulation device (FPMD) to suppress front-end optical path difference (OPD) noise in heterodyne interferometry systems, particularly addressing noise induced by acoustic-optic modulator sideband coupling. To achieve real-time optical path stabilization, the FPMD employs a polarization-maintaining fiber coupled with piezoelectric ceramics in a monolithic aluminum structure. The compact, all-fiber design offers enhanced immunity to environmental disturbances while simplifying integration into precision interferometric systems. Through systematic characterization, the FPMD exhibits a highly linear response ( nm V−1, R2 = 0.99914) and effective noise suppression in the critical sub-10 mHz frequency band, achieving picometer-level ranging accuracy across the entire frequency band above 2 mHz. This work provides a theoretical framework and experimental validation for a robust solution to OPD noise in ultra-high-precision metrology applications.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"12 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145771426","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 : 2025-12-18DOI: 10.1088/1361-6382/ae2730
Marcos V de S Silva, T M Crispim, G Alencar, R R Landim and Manuel E Rodrigues
In this work, following our recent findings in Alencar et al (2025 Phys. Dark Universe49 102060), we extend our analysis to explore the generalization of spherically symmetric and static black-bounce (BB) solutions, known from General Relativity, within the framework of the f(R) theory in the metric formalism. We develop a general approach to determine the sources for any model where , provided that the corresponding source for the bounce metric in General Relativity is known. As a result, we demonstrate that BB solutions can emerge from this theory when considering the coupling of f(R) gravity with nonlinear electrodynamics and a partially phantom scalar field. We also analyzed the energy conditions of these solutions and found that, unlike in General Relativity, it is possible to satisfy all energy conditions in certain regions of space-time.
{"title":"Generalized black-bounces solutions in f(R) gravity and their field sources","authors":"Marcos V de S Silva, T M Crispim, G Alencar, R R Landim and Manuel E Rodrigues","doi":"10.1088/1361-6382/ae2730","DOIUrl":"https://doi.org/10.1088/1361-6382/ae2730","url":null,"abstract":"In this work, following our recent findings in Alencar et al (2025 Phys. Dark Universe49 102060), we extend our analysis to explore the generalization of spherically symmetric and static black-bounce (BB) solutions, known from General Relativity, within the framework of the f(R) theory in the metric formalism. We develop a general approach to determine the sources for any model where , provided that the corresponding source for the bounce metric in General Relativity is known. As a result, we demonstrate that BB solutions can emerge from this theory when considering the coupling of f(R) gravity with nonlinear electrodynamics and a partially phantom scalar field. We also analyzed the energy conditions of these solutions and found that, unlike in General Relativity, it is possible to satisfy all energy conditions in certain regions of space-time.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"20 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145771427","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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