Astrophysics – Page 48 – Kavli Institute Pre-Print Publications

PixelPop: High Resolution Nonparameteric Inference of Gravitational-Wave Populations in Multiple Dimensions

Posted by dbos June 24, 2024MIT

Kavli Affiliate: Salvatore Vitale | First 5 Authors: Jack Heinzel, Matthew Mould, Sofía Álvarez-López, Salvatore Vitale, | Summary: The origins of merging compact binaries observed by gravitational-wave detectors remains highly uncertain. Several astrophysical channels may contribute to the overall merger rate, with distinct formation processes imprinted on the structure and correlations in the underlying distributions […]

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The FRB-searching pipeline of the Tianlai Cylinder Pathfinder Array

Posted by June 22, 2024Chicago

Kavli Affiliate: Albert Stebbins | First 5 Authors: Zijie Yu, Furen Deng, Shijie Sun, Chenhui Niu, Jixia Li | Summary: This paper presents the design, calibration, and survey strategy of the Fast Radio Burst (FRB) digital backend and its real-time data processing pipeline employed in the Tianlai Cylinder Pathfinder array. The array, consisting of three […]

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Parity-Odd Power Spectra: Concise Statistics for Cosmological Parity Violation

Posted by dbos June 21, 2024Tokyo

Kavli Affiliate: Eiichiro Komatsu | First 5 Authors: Drew Jamieson, Angelo Caravano, Jiamin Hou, Zachary Slepian, Eiichiro Komatsu | Summary: We introduce the Parity-Odd Power (POP) spectra, a novel set of observables for probing parity violation in cosmological $N$-point statistics. POP spectra are derived from composite fields obtained by applying nonlinear transformations, involving also gradients, […]

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Parity-Odd Power Spectra: Concise Statistics for Cosmological Parity Violation

Posted by dbos June 21, 2024Tokyo

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Early Galaxies and Early Dark Energy: A Unified Solution to the Hubble Tension and Puzzles of Massive Bright Galaxies revealed by JWST

Posted by dbos June 21, 2024MIT

Kavli Affiliate: Mark Vogelsberger | First 5 Authors: Xuejian Shen, Mark Vogelsberger, Michael Boylan-Kolchin, Sandro Tacchella, Rohan P. Naidu | Summary: JWST has revealed a large population of ultra-violet (UV)-bright galaxies at $zgtrsim 10$ and possibly overly massive galaxies at $zgtrsim 7$, challenging standard galaxy formation models in the $Lambda$CDM cosmology. We use an empirical […]

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FlowBench: Revisiting and Benchmarking Workflow-Guided Planning for LLM-based Agents

Posted by dbos June 21, 2024July 9, 2024Peking

Kavli Affiliate: Ke Wang | First 5 Authors: Ruixuan Xiao, Wentao Ma, Ke Wang, Yuchuan Wu, Junbo Zhao | Summary: LLM-based agents have emerged as promising tools, which are crafted to fulfill complex tasks by iterative planning and action. However, these agents are susceptible to undesired planning hallucinations when lacking specific knowledge for expertise-intensive tasks. […]

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Growth of high redshift supermassive black holes from heavy seeds in the BRAHMA cosmological simulations: Implications of overmassive black holes

Posted by dbos June 20, 2024July 9, 2024MIT

Kavli Affiliate: Mark Vogelsberger | First 5 Authors: Aklant K Bhowmick, Laura Blecha, Paul Torrey, Rachel S Somerville, Luke Zoltan Kelley | Summary: JWST has recently revealed a large population of accreting black holes (BHs) in the early Universe. Even after accounting for possible systematic biases, the high-z $M_*-M_{rm rm bh}$ relation derived from these […]

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Roman FFP Revolution: Two, Three, Many Plutos

Posted by dbos June 20, 2024July 9, 2024Peking

Kavli Affiliate: Subo Dong | First 5 Authors: Andrew Gould, Jennifer C. Yee, Subo Dong, , | Summary: Roman microlensing stands at a crossroads between its originally charted path of cataloging a population of cool planets that has subsequently become well-measured down to super-Earths, and the path of free-floating planets (FFPs), which did not exist […]

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Roman FFP Revolution: Two, Three, Many Plutos

Posted by dbos June 20, 2024Peking

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The Radius of the High Mass Pulsar PSR J0740+6620 With 3.6 Years of NICER Data

Posted by dbos June 20, 2024July 9, 2024MIT

Kavli Affiliate: Deepto Chakrabarty | First 5 Authors: Tuomo Salmi, Devarshi Choudhury, Yves Kini, Thomas E. Riley, Serena Vinciguerra | Summary: We report an updated analysis of the radius, mass, and heated surface regions of the massive pulsar PSR J0740+6620 using NICER data from 2018 September 21 to 2022 April 21, a substantial increase in […]

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