Classical and Quantum Gravity

Journal: Classical and Quantum Gravity

Abbreviation

Class. Quantum Grav.

Publisher

IOP Publishing

ISSN

0264-9381
1361-6382

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Publications 1 - 10 of 38

Gravitational waves decohere quantum superpositions
Linton, Flynn; Tiwari, Shubhanshu (2025)
Classical and Quantum Gravity
Understanding the interplay between quantum mechanical systems and gravity is a crucial step towards unifying these two fundamental ideas. Recent theoretical developments have explored how global properties of spacetime would cause a quantum spatial superposition to lose coherence. In particular, this loss of coherence is closely related to the memory effect, which is a prominent feature of gravitational radiation. In this work, we explore how a burst of gravitational radiation from a far-away source would decohere a quantum superposition. We identify the individual contributions to the decoherence from the memory and oscillatory components of the gravitational wave source, corresponding to hard and soft graviton emissions, respectively. In general, the memory contributions dominate, while the oscillatory component of the decoherence is strongly dependent on the phase of the burst when it is switched off. This work demonstrates how quantum systems can lose coherence from interactions with a classical gravitational field. We also comment on the electromagnetic analogue of this effect and discuss its correspondence to the gravitational case.
The LISA Pathfinder interferometry
Audley, H.; Giardini, Domenico; Mance, Davor; et al. (2011)
Classical and Quantum Gravity
The LISA Pathfinder mission
Antonucci, F.; Armano, M.; Audley, H.; et al. (2012)
Classical and Quantum Gravity
Constraints on LISA Pathfinder's self-gravity: Design requirements, estimates and testing procedures
Armano, M.; Audley, H.; Auger, G.; et al. (2016)
Classical and Quantum Gravity
Robust Bayesian inference with gapped LISA data using all-in-one TDI-∞
Houba, Niklas; Bayle, Jean-Baptiste; Vallisneri, Michele (2025)
Classical and Quantum Gravity
The Laser Interferometer Space Antenna (LISA), an European Space Agency L-class mission, is designed to detect gravitational waves in the millihertz frequency band, with operations expected to begin in the next decade. LISA will enable groundbreaking studies of astrophysical phenomena such as massive black hole mergers, extreme mass ratio inspirals, and compact binary systems. A key challenge in analyzing LISA’s data is the significant laser frequency noise, which must be suppressed using time-delay interferometry (TDI) during on-ground processing. Classical TDI mitigates this noise by algebraically combining phase measurements taken at different times and spacecraft. However, data gaps caused by instrumental issues or operational interruptions complicate the process. These gaps affect multiple TDI samples due to the time delays inherent to the algorithm, rendering surrounding measurements unusable for parameter inference and degrading overall data quality. In this paper, we apply the recently proposed variant of TDI known as TDI-∞ to astrophysical parameter inference, focusing on the challenge posed by data gaps. TDI-∞ frames the LISA likelihood numerically in terms of raw measurements, marginalizing over laser phase noises under the assumption of infinite noise variance. Additionally, TDI-∞ is set up to incorporate and cancel other noise sources beyond laser noise, including optical bench motion, clock noise, and modulation noise, establishing it as an all-in-one TDI solution. The method gracefully handles measurement interruptions, removing the need to explicitly address discontinuities during gravitational-wave template matching. We integrate TDI-∞ into a Bayesian framework, demonstrating its superior performance in scenarios involving data gaps. Compared to classical TDI, the method preserves signal integrity more effectively and is particularly interesting for low-latency applications, where the limited amount of available data makes data gaps particularly disruptive. The study’s results highlight the potential of TDI-∞ to enhance LISA’s scientific capabilities, paving the way for more robust data analysis pipelines.
Blowup of the local energy of linear waves at the Reissner–Nordström–AdS Cauchy horizon
Kehle, Christoph (2021)
Classical and Quantum Gravity
LISA Pathfinder: the experiment and the route to LISA
Armano, M.; Benedetti, M.; Bogenstahl, J.; et al. (2009)
Classical and Quantum Gravity
Black holes, gravitational waves and fundamental physics: a roadmap
Barack, Leor; Heisenberg, Lavinia; et al. (2019)
Classical and Quantum Gravity
The Gravito-Maxwell equations of General Relativity in the local reference frame of a GR-noninertial observer
Schmid, Christoph (2023)
Classical and Quantum Gravity
We show that the acceleration-difference of neighboring freefalling particles (= geodesic deviation) measured in the local reference frame of a noninertial observer in general relativity (GR) is not given by the Riemann tensor. With the gravito-electric field Eg of GR defined as the acceleration of freefalling quasi-static particles relative to the observer, divEg measured in the reference frame of a GR-noninertial observer is different from the curvature R00. We derive our exact, explicit, and simple gravito-Gauss law for divEg in our new reference frame of a GR-noninertial observer with his LONB (Local Ortho-Normal Basis ¯eˆa) and his LONB-connections (ωˆbˆa)ˆc in his time- and 3-directions: the sources of divEg are contributed by all fields including the GR-gravitational fields (Eg,Bg). In the reference frame of a GR-inertial observer our gravito-Gauss law coincides with with Einstein’s R00 equation, which does not have gravitational fields as sources. We derive the gravito-Ampère law for curlBg, the gravito-Faraday law for curlEg, and the law for divBg. The densities of energy, momentum, and momentum-flow of GR-gravitational fields (Eg,Bg) are local observables, but they depend on the observer with his local reference frame: if measured by a GR-inertial observer on his worldline in his frame of LONB con nections, these quantities are zero. For a GR-noninertial observer the sources of gravitational energy, momentum, and momentum-flow densities have the opposite sign from the electromagnetic and matter sources. The sources in the gravito-Gauss law contributed by gravitational energy and momentum-flow densities have a repulsive effect on the gravitational acceleration-difference of particles. This contributes to the accelerated expansion of our inhomogeneous Universe today.
The Schwarzschild-black string AdS soliton
Haehl, Felix M. (2013)
Classical and Quantum Gravity

Publications 1 - 10 of 38

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