Tootfinder

Frequency drift corrected ultra-stable laser through phase-coherent fiber producing a quantum channel
Stanley Johnson, Sandeep Mishra, Anirban Pathak, Subhadeep De
https://arxiv.org/abs/2509.08419

Frequency drift corrected ultra-stable laser through phase-coherent fiber producing a quantum channel
Phase coherent fibers (PCF) are essential to distribute nearly monochromatic photons, ultra-stable in their frequency and phases, which have demanding requirements for state-of-the-art networked experiments, quantum as well as very high-speed communications. We report the development of a novel system that produces PCF links, also actively corrects the unavoidable slow frequency drift of the source laser. The PCF follows white phase noise limited $σ_o \times τ^{-1}$ stability behavior having …

Multi-messenger Analysis of Supermassive Black Hole Binaries: The Joint-likelihood Approach
Maria Charisi, Stephen Taylor, Jessie Runnoe, Caitlin Witt, Polina Petrov
https://arxiv.org/abs/2510.08683

Multi-messenger Analysis of Supermassive Black Hole Binaries: The Joint-likelihood Approach
Supermassive black hole binaries (SMBHBs) formed in galaxy mergers are promising multi-messenger sources. They can be identified as quasars with periodic variability in electromagnetic (EM) time-domain surveys. The most massive of those systems can be detected by Pulsar Timing Arrays (PTAs) in the nanohertz frequency gravitational-wave (GW) band. We present a method to simultaneously analyze EM lightcurves and PTA observations as a multi-messenger data stream. For this, we employ a joint likeli…

Prospects and Limitations of PTAs Anisotropy Searches -- The Frequentist Case
Thomas Konstandin, Anna-Malin Lemke, Andrea Mitridate, Enrico Perboni
https://arxiv.org/abs/2509.07074

Prospects and Limitations of PTAs Anisotropy Searches -- The Frequentist Case
Recent findings from several Pulsar Timing Array (PTA) collaborations point to the existence of a Gravitational Wave Background (GWB) at nanohertz frequencies. A key next step towards characterizing this signal and identifying its origin is to map the sky distribution of its power. Several strategies have been proposed to reconstruct this distribution using PTA data. In this work, we compare these different strategies to determine which one is best suited to detect GWB anisotropies of different…

Pitch Estimation With Mean Averaging Smoothed Product Spectrum And Musical Consonance Evaluation Using MASP
Murat Yasar Baskin
https://arxiv.org/abs/2510.06625 https://

Pitch Estimation With Mean Averaging Smoothed Product Spectrum And Musical Consonance Evaluation Using MASP
This study introduces Mean Averaging Smoothed Product (MASP) Spectrum, which is a modified version of the Harmonic Product Spectrum, designed to enhance pitch estimation for many algorithm-wise deceptive frequency spectra that still lead clear pitches, for both harmonic and inharmonic cases. By introducing a global mean based smoothing for spectrum, the MASP algorithm diminishes the unwanted sensitivity of HPS for spectra with missing partials. The method exhibited robust pitch estimations cons…

Mapping the Gravitational-wave Background Across the Spectrum with a Next-Generation Anisotropic Per-frequency Optimal Statistic
Kyle A. Gersbach, Stephen R. Taylor, Bence B\'ecsy, Anna-Malin Lemke, Andrea Mitridate, Nihan Pol
https://arxiv.org/abs/2509.07090

Mapping the Gravitational-wave Background Across the Spectrum with a Next-Generation Anisotropic Per-frequency Optimal Statistic
With pulsar timing arrays (PTAs) having observed a gravitational wave background (GWB) at nanohertz frequencies, the focus of the field is shifting towards determining and characterizing its origin. While the primary candidate is a population of GW-emitting supermassive black hole binaries (SMBHBs), many other cosmological processes could produce a GWB with similar spectral properties as have been measured. One key argument to help differentiate an SMBHB GWB from a cosmologically sourced one is…

Frequent Extreme Galaxy-scale Outflows among Luminous Early Quasars
Weizhe Liu, Xiaohui Fan, Huan Li, Richard Green, Jinyi Yang, Xiangyu Jin, Jianwei Lyu, Maria Pudoka, Yongda Zhu, Eduardo Banados, Silvia Belladitta, Thomas Connor, Tiago Costa, Roberto Decarli, Anna-Christina Eilers, Hyunsung Jun, Madeline A. Marshall, Chiara Mazzucchelli, Jan-Torge Schindler, Yue Shen, Sylvain Veilleux, Julien Wolf, Huanian Zhang, Mingyang Zhuang, Siwei Zou, Mingyu Li

Frequent Extreme Galaxy-scale Outflows among Luminous Early Quasars
The existence of abundant post-starburst/quiescent galaxies just $\sim$1-2 Gyrs after the Big Bang challenges our current paradigm of galaxy evolution. Cosmological simulations suggest that quasar feedback is likely the most promising mechanism responsible for such rapid quenching. Here we report a high detection rate (6/27) of exceptionally fast and powerful galaxy-scale outflows traced by [O III] emission in z $\sim$ 5-6 luminous quasars as revealed by the James Webb Space Telescope (JWST), w…