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Earlier sources: Astronomy
This space thread follows astronomy through original research, public projects, and source reports. Read the evidence below to see which developments are represented in SYMTRI’s archive.
SYMTRI organizes observations from public sources into a living map. Connections reflect shared subject matter; they do not establish causation or endorse a source.
Open in the map ↗263 classified signals in the fourteen-day window. These counts include signals awaiting readable evidence.
Earlier sources
Up to ten sources with readable evidence, ordered by their feed timestamp. These archive sources can be older than the live fourteen-day window. This list is a sample, not a measure of total activity. Dates distinguish paper publication, repository creation, model/dataset activity, Hacker News posts, and KEV catalog additions. “First archived” records when SYMTRI first stored the signal.
- arXiv · Published · First archived
ALMA2040: Mapping the Spatially Resolved Dust and Star Formation Physics Driving High-z Galaxy Assembly ↗
Interstellar dust reprocesses approximately half of the starlight emitted across cosmic history. However, dust temperature, which is essential to convert continuum flux into dust mass, molecular gas mass, and obscured star-formation rates, remains largely unconstrained on sub-galactic scales at high redshift. While single-band ALMA imaging has characterized continuum sizes for hundreds of z>1 galaxies, single-frequency measurements cannot separate the dust mass column from the local dust heating. To date, spatially resolved ( 1, with ongoing programs within a few years adding at most a few doz…
- arXiv · Published · First archived
Properties and limitations of linear models for mutual coupling in 21 cm arrays ↗
Mutual coupling between elements of low-frequency arrays is a leading systematic for 21 cm cosmology, leaking bright foregrounds into otherwise clean regions of the power spectrum. Many mitigation models describe coupling as a linear combination of uncoupled signals re-radiated from neighboring feeds, but data suggest additional mechanisms. Inspired by antenna scattering theory, we decompose coupling into an antenna mode, constructed from translated isolated responses and expected to be removable by linear combination models, and a structural mode, the remainder. Full-wave simulations of HERA-…
- arXiv · Published · First archived
The gravitational constant and the cosmic microwave background ↗
The CMB constrains the gravitational constant $G$ at recombination to a few percent of its laboratory value, but the effect of $G$ on recombination itself is usually absorbed into a global fit rather than made explicit. We return to the semi-analytic description of the acoustic spectrum to ask how the acoustic scale $\ell_A$, the equality scale $\ell_{\rm eq}$ and the damping scale $\ell_{\rm damp}$ respond to a variation of $G$ during recombination, and where $G$ enters the residual ionization of the dark ages. We use a modified version of CLASS in which $G$ is varied through $λ_G \equiv \sqr…
- arXiv · Published · First archived
From Axion Detection to Dark Matter Astronomy ↗
A global haloscope network could turn an axion discovery into astronomy of dark matter substructure and transients. We combine interferometric phase, spatial coherence, and spectroscopy to study the formation and evolution of axion substructure through measurements of flow directions and velocity distributions. For tidal streams, a four-site forecast shows how longitudinal and transverse velocity dispersions can be measured jointly. Interpreted with dynamical and population models, these measurements could test axion production scenarios. Extensions to miniclusters, axion stars, and emitted bu…
- arXiv · Published · First archived
The Radius-Luminosity Relationship for Active Galactic Nuclei with Hierarchical Bayesian Reverberation Mapping ↗
Reverberation mapping of active galactic nuclei uses the time taken for variability to travel through the system as a measure of system size, with this size being used to inform estimates of the mass of the central black hole, a technique that has graduated to an industrial-scale effort in recent decades. Such large target-count, multi-year surveys have been consistently undercut by poor light curve quality and the aliasing problems of seasonal observations. These impacts compound with statistical approaches that are not consistent between works and sometimes combine inconsistent statistical f…
- arXiv · Published · First archived
Chemistry on solar system scales ↗
The initial chemical composition of planets, primitive bodies in our solar system, and exoplanets is ultimately set by their nascent protoplanetary disks. Yet observing key carbon-, oxygen-, and nitrogen-bearing molecules (as well as rarer but important sulphur- and phosphorus-bearing species) in the inner (exo)planet-forming zone ($\lesssim 10$~au) remains extremely challenging with current facilities. Therefore, to construct a complete picture of the chemistry of planet formation and understand how (exo)planetary composition is set by physical and chemical processes within the protoplanetary…
- arXiv · Published · First archived
Multi-wavelength Polarization as a Probe of Planet Formation ↗
Polarization reveals details of circumstellar disks that are not readily available from total intensity observations. Via multi-wavelength polarimetric observations of disks, we can trace how planets form, how dust grains evolve at the onset of planet formation, and how magnetic fields (B-fields) influence accretion. Since polarized emission from these disks is typically at levels from 0.5% to a few percent of the total emission, very high sensitivities are needed. Current ALMA capabilities make these key measurements of protoplanetary disks challenging due to (1) long integrations with separa…
- arXiv · Published · First archived
Time-reversible timestepping in many-body planetary systems ↗
Simulating chaotic planetary system evolution requires resolving small time-scales due to close encounters, scattering, collisions, and more. Simulations typically assign fixed timesteps to all particles, however, which is inefficient and wastes compute resources in a chaotically evolving system; moreover, it may under-resolve the simulation. Hybrid methods are a blunt tool for resolving small time-scales as they do not allow for fine-grained adaptation. Assigning individual timesteps, which vary in time, to planetary bodies usually violates desirable properties such as symplecticity and rever…
- Hacker News · Posted on Hacker News · First archived
Muslim Prayer Reminder MCP: Astronomical prayer calculation engine ↗
Hacker News discussion.
- arXiv · Published · First archived
Planetary system architectures in the final stages of planet formation ↗
The processes in the last stages of planet formation determine the final assembly and composition of planets. After the protoplanetary discs dissipate, a system of planets and planetesimals -- analogues of the Asteroid and Kuiper Belts -- remains. Ongoing collisions between these bodies produce second-generation dust and gas that form a debris disc. Resolved images of such belts allow us to trace the dynamical history of these systems, including giant impacts and planet-belt interactions, during the crucial era from 10 to a few 100 Myr of terrestrial planet formation. High-resolution mm and op…
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How to assess evidence about Astronomy
Check each original source for its methods, release status, limitations, and supporting data. A repository announcement, a preprint, and a published study provide different kinds of evidence. SYMTRI’s subject classification helps discovery; it does not independently validate the source’s claims.
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