#LISACommunityTalks

The #LISACommunity recently hosted a talk by Ollie Burke about a paper by Ollie Burke, Sylvain Marsat, Jonathan R. Gair, Michael L. Katz: "Mind the gap: addressing data gaps and assessing noise mismodeling in LISA", which can be found here 👉 https://arxiv.org/abs/2502.17426

Here's a summary of the paper:

"Communication outages and malfunctions for complicated space-missions are simply an inevitability. Although talented personnel will craft an instrument that runs as smoothly as possible, the space-based gravitational wave observatory LISA will be no outlier — LISA will observe gaps and gremlins in the data. These artefacts could violate a number of assumptions scientists usually place on the data prior to analysis, potentially hampering our ability to extract gravity waves from the data that are generated from collisions of the most extreme compact objects within our universe. This talk (with associated paper) details calculations, theory and computational techniques that can be used to mitigate the impact of data gaps on LISA-based gravitational wave data analysis."

#LISACommunityTalks

The #LISACommunity recently hosted a talk by David Maibach about a paper by Nils Deppe, Lavinia Heisenberg, Henri Inchauspé, Lawrence E. Kidder, David Maibach, Sizheng Ma, Jordan Moxon, Kyle C. Nelli, William Throwe, Nils L. Vu: "Echoes from Beyond: Detecting Gravitational Wave Quantum Imprints with LISA", which can be found here 👉 https://arxiv.org/abs/2411.05645

#LISACommunityTalks

The #LISACommunity recently hosted a talk by Sarah Paczkowski about a paper by Marie-Sophie Hartig, Sarah Paczkowski, Martin Hewitson, Gerhard Heinzel, Gudrun Wanner: "Post-processing subtraction of tilt-to-length noise in LISA in the presence of gravitational wave signals", which can be found here 👉 https://arxiv.org/abs/2411.14191 and https://journals.aps.org/prd/abstract/10.1103/PhysRevD.111.043048

#LISACommunityTalks

The #LISACommunity recently hosted a talk by Jan Niklas Reinhardt on a paper by Jan Niklas Reinhardt, Olaf Hartwig, Gerhard Heinzel: "Clock synchronization and light-travel-time estimation for space-based gravitational-wave detectors", linked here 👉 https://arxiv.org/abs/2408.09832 and https://iopscience.iop.org/article/10.1088/1361-6382/ada2d3

Here's a summary of the paper:

"Space-based gravitational-wave detectors, such as LISA, record interferometric measurements on widely separated satellites. Their clocks are not actively synchronized. Instead, clock synchronization is performed in on-ground data processing using pseudorange measurements, which entangle the interspacecraft ranges with the relative clock desynchronizations. To achieve clock synchronization between the spacecraft, we need to isolate these clock desynchronizations by disentangling the pseudoranges. We introduce a nonstandard Kalman filter algorithm for this purpose, designed for systems where pseudorange measurements are taken in different time frames. This algorithm enables clock synchronization and light travel time estimation with sub-meter accuracy."

#LISACommunityTalks

The #LISACommunity recently hosted a talk by Valerio De Luca on a paper by Valerio De Luca, Justin Khoury, Sam S. C. Wong: "Gravitational memory and soft theorems: the local perspective", linked here 👉 https://arxiv.org/abs/2412.01910 and https://arxiv.org/abs/2412.12273 (accepted in PRD at https://journals.aps.org/prd/accepted/76071Qd0M2118331f5b87943d34c36b167b45d9d9)

Here's a summary of the paper:

"Gravitational memory describes the lasting effect on freely falling detectors after a gravitational wave passes by, and it has been intimately connected to asymptotic symmetries and soft theorems.
In this talk, we will explore a new symmetry perspective of gravitational memory in synchronous coordinates, which are relevant for detectors like LISA.
We will show how memory ties to residual coordinate transformations, such as volume-preserving spatial rescalings, and we will derive the corresponding soft theorems for both scattering amplitudes and correlation functions. The latter are recognized as the flat-space analog of soft theorems in inflationary cosmology."

#LISACommunityTalks

The #LISACommunity recently hosted a talk by Senwen Deng on a paper by Senwen Deng, Stanislav Babak, Maude Le Jeune, Sylvain Marsat, Éric Plagnol, Andrea Sartirana: "Modular global-fit pipeline for LISA data analysis", linked here 👉 https://arxiv.org/abs/2501.10277

Here's a summary of the paper:

"The #LISAMission data band is expected to be dominated by gravitational wave signals emitted by a plethora of astrophysical sources. Signals of the Galactic white dwarf Binaries are long-lived, overlapping in time and their unresolved residual forms a confusion noise. Massive Black Hole Binary signals are loud and broadband, hindering the estimation of the noise property, the knowledge of which is key to the detection and parameter estimation for the gravitational wave signals. We came up with a modular two-stage iterative pipeline prototype to disentangle the intertwined signals and to infer the parameters for the different signal sources and the noise level. We demonstrated its capability by applying it to simulated LISA dataset known as "Sangria", where we managed to recover the injected parameters at the simulation with faithfulness."