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@cdarwin@c.im
2025-07-22 01:42:32

Hundreds of employees at the National Aeronautics and Space Administration (NASA)
have signed an open letter,
directed to Department of Transportation (DOT) Secretary Sean Duffy,
criticizing proposed cuts to the agency
and condemning recent policies that could potentially harm the U.S.
The letter, titled
“The Voyager Declaration”
in honor of two spacecraft that were launched by NASA in the 1970s
(that continue to zoom beyond the boundaries of t…

Hundreds of NASA Employees Write Open Letter Blasting Trump Over “Rapid and Wasteful Changes” to Agency
Trump’s cuts will “leave the American people without the unique public good that NASA provides,” NASA workers wrote.

@arXiv_astrophGA_bot@mastoxiv.page
2025-06-18 09:41:33

The DORCHA suite: nature, nurture, and the phase space distribution of the Milky Way's high redshift progenitors today
Sreedhar Balu, Chris Power, Kris Walker, J. Stuart B. Wyithe
arxiv.org/abs/2506.14016

The DORCHA suite: nature, nurture, and the phase space distribution of the Milky Way's high redshift progenitors today
Where in the present-day Milky Way should we search for the remnants of its earliest stars? We address this question using the DORCHA (Gaelic for Dark; DUR-uh-khuh) suite: a set of 25 high-resolution, dark-matter-only cosmological zoom-in simulations of Milky Way analogue (MWA) haloes evolved to $z=0$. Of these, 15 are isolated and the rest are in pairs, similar to the MW and M31. By identifying and tagging the most bound material in high-redshift ($z\geq5$) progenitor haloes -- those likely to…

@arXiv_hepth_bot@mastoxiv.page
2025-08-11 07:47:59

Universal sectors of two-dimensional Carrollian CFTs
Ankit Aggarwal, Arjun Bagchi, Stephane Detournay, Daniel Grumiller, Max Riegler, Joan Simon
arxiv.org/abs/2508.05735

Universal sectors of two-dimensional Carrollian CFTs
We revisit modular invariance in two-dimensional Carrollian conformal field theories from a geometric perspective. Focusing on the characters of the induced and highest-weight representations of the theory, we show that there are regions of parameter space where the vacuum character dominates in the dual channel. We use this property to zoom into different subsectors of the Carrollian theory. One of them is reminiscent of the Schwarzian sector of a relativistic CFT2 and has a flat space hologra…

@unchartedworlds@scicomm.xyz
2025-07-19 08:48:43
Content warning: BiCon coming up, Fri 25 to Sun 27 July 2025, Nottingham and online

BiCon comes to Nottingham this Friday!
It's a masking-friendly, though not mask-required, event, in a venue which is said to be pretty good for air quality.
There's also an online-only option, which I went to myself last year when the in-person side wasn't in Nottingham. We had a nice little group being companionable on the Zoom, with some of the in-person sessions running as hybrid.
You don't have to be bi to go - just bi-friendly and trans-inclusive. Typically it does include some non-bi people who just like the vibes :-)
Sliding-scale admission prices:
- in-person weekend tickets £65 down to £20
- in-person day tickets £40 down to £10
- online weekend tickets £20 down to £4.
Venue this year is two of the buildings belonging to the girls' high school, in between the Forest and the Arboretum. Nearest tram stop is High School. Nearest bus lines are brown, green, yellow, and purple.
There's usually a variety of session options in the day: some talky and some not; some bi-themed, some unrelated. In the evenings there'll be social space. Some people will go and march as a group in Notts Pride on the Saturday. I'm going to host an online pre-meet on the Wednesday evening.
Myself I've booked for the weekend, but in reality I might only make it to the online-Wednesday-pre-meet and the Friday, esp if I do go to Notts Pride on the Saturday. I might be all used up by Saturday night. (Even pre-covid I might've run out of steam by then :-) ) But if I didn't come in on the Sunday, I probably would still join in at least a little bit online.
More below on what I'm planning to contribute!
Feel free to ping me if you have questions :-)
#bi #trans #Nottingham #EastMidlands #England #UK #BiCon #bisexual #bisexuality #queer #LGBT #LGBTQ

@arXiv_astrophGA_bot@mastoxiv.page
2025-06-12 08:41:31

Bar-driven dispersal of Galactic substructure
Adam M. Dillamore, Jason L. Sanders
arxiv.org/abs/2506.09117 arxiv.org/…

Bar-driven dispersal of Galactic substructure
Galactic archaeologists often assume that integrals of motion (IoMs) such as $L_z$ and $E$ are conserved, so substructure remains frozen in IoM space over many Gyr. However, this is not true in the Milky Way due in part to its rotating bar. In this study we quantify the effects of the bar on the dynamics of substructure. We employ three different theoretical models: an analytical toy model; a set of test particle simulations with steady and slowing bars; and a cosmological zoom-in simulation of…

@arXiv_grqc_bot@mastoxiv.page
2025-07-03 09:17:10

Parameter estimation of gravitational waves from hyperbolic black hole encounters
Chad Henshaw, Jacob Lange, Peter Lott, Richard O'Shaughnessy, Laura Cadonati
arxiv.org/abs/2507.01156

Parameter estimation of gravitational waves from hyperbolic black hole encounters
Systems of two black holes with unbound orbits can produce a diverse array of gravitational wave signals with rich morphology. This parameter space encompasses both hyperbolic orbit scattering events and dynamical captures, including zoom-whirl orbits with multiple flybys and direct plunge mergers. These signals challenge traditional parameter estimation infrastructure, which is largely optimized for quasicircular inspiral binaries. In this work we discuss the adaptation of the Rapid Iterative …