Tootfinder

Topological Relics of Infrared QED in the Rayleigh-Jeans Regime
J. Gamboa
https://arxiv.org/abs/2508.14928 https://arxiv.org/pdf/2508.14928

Topological Relics of Infrared QED in the Rayleigh-Jeans Regime
We revisit infrared Quantum Electrodynamics (QED) by reformulating the dressing of charged states in terms of a functional Berry connection. In this framework, the electron--photon cloud acquires a topological character, leading to a modification of the Rayleigh-Jeans limit of blackbody radiation. The deviation is controlled by a dimensionless parameter $ε$, estimated as $ε\simeq (1.7$--$2.3)\times 10^{-3}$ in the $80$-$110~\mathrm{GHz}$ range, corresponding to a fractional shift of $\sim 0.2…

Rapid and accurate numerical evolution of linear cosmological perturbations with non-cold relics
Nanoom Lee, Jos\'e Luis Bernal, Sven G\"unther, Lingyuan Ji, Marc Kamionkowski
https://arxiv.org/abs/2506.01956

Rapid and accurate numerical evolution of linear cosmological perturbations with non-cold relics
We describe the implementation of a new approach to the numerical evaluation of the effects of non-cold relics on the evolution of cosmological perturbations. The Boltzmann hierarchies used to compute the contributions of these relics to the stress-energy tensor are replaced with a set of integral equations. These integral equations take the form of convolutions and are solved iteratively with the rest of the system. We develop efficient algorithms for evaluating these convolutions using non-un…

a casket containing relics from Bach’s tomb

PSZ2 G181.06 48.47 - X-Ray Exploration of / Radio Analysis of / Weak-lensing Analysis and Merging Scenario Reconstruction of a Low-mass Cluster with Exceptionally Distant Radio Relics: #GalaxyClusters on Course to Crash Again, NASA's Chandra Finds: https://chandra.si.edu/photo/2025/g181/ / https://www.nasa.gov/image-article/galaxy-clusters-on-course-to-crash-again-nasas-chandra-finds/

A dangerous shift is happening online.
All around the world, governments are quietly rewriting the rules of internet access.
Soon, privacy and anonymity online may become relics of the past.
The UK’s newly enacted Online Safety Act marks a fundamental shift.
You now need to verify your identity simply to watch a video, visit a website, or share your thoughts.
The Act mandates strict age verification and identity checks for websites and platforms considered to ho…

Show Your Papers: The Internet Is About to Change Forever — Ludlow Institute
A crackdown sweeping the globe is replacing the free internet with government surveillance

It’s not the mistakes that matter. Apple has made them before. The Newton, MobileMe, the butterfly keyboard. What matters is the posture. A company once defined by joyful provocation—by thinking different—is now defined by its defensiveness. Its leadership acts not like inventors but like stewards of a status quo. They protect margins like relics. They fear dilution. They optimize at the expense of surprise.

Apple’s Diet of Worms
On a crisp April morning in 1521, the twenty-one-year-old Emperor Charles V entered the Bishop’s Palace in Worms. The weight of a continent rested on his adolescent shoulders, and he carried it with the stiff dignity of someone raised to believe history itself had chosen him. He wore black

Early in my career my CIO, although not the title at the time, asked "Why would anyone want to connect two LANs together?" He also said "All computers will cost around $100 in about a year and you'll be able to get them at a grocery store."
His deputy report would say it is impossible to conduct commerce over HTTP.
These were relics of the mainframe world, and made these statements before the Internet went commercial. I knew they were absurd and wrong, and…

The Effective Field Theory of Large Scale Structure for Mixed Dark Matter Scenarios
Francesco Verdiani, Emanuele Castorina, Ennio Salvioni, Emiliano Sefusatti
https://arxiv.org/abs/2507.08792

The Effective Field Theory of Large Scale Structure for Mixed Dark Matter Scenarios
We initiate a systematic study of the perturbative nonlinear dynamics of cosmological fluctuations in dark sectors comprising a fraction of non-cold dark matter, for example ultra-light axions or light thermal relics. These mixed dark matter scenarios exhibit suppressed growth of perturbations below a characteristic, cosmologically relevant, scale associated with the microscopic nature of the non-cold species. As a consequence, the scale-free nonlinear solutions developed for pure cold dark mat…

Primordial high energy neutrinos: theoretical/observational constraints and sharp spectral features
Nicolas Grimbaum Yamamoto, Thomas Hambye
https://arxiv.org/abs/2507.02063

Primordial high energy neutrinos: theoretical/observational constraints and sharp spectral features
Among the few ways that allow or could allow us to probe the early Universe from the observation of a flux of primordial particles, there is one possibility which has been little studied: the observation today of high energy neutrinos which could have been emitted shortly after the Big Bang, from the decay or annihilation of early universe relics. We perform a general study of such a possibility. To this end we first emphasise that these neutrinos could display various kinds of sharp spectral f…

Origin of the ~150 kpc radio filament in galaxy ESO 137-006
Toushif Alam, Kunal P. Mooley, Kartick C. Sarkar
https://arxiv.org/abs/2507.23026 https://arxiv…

Origin of the ~150 kpc radio filament in galaxy ESO 137-006
Sensitive wide-field radio surveys have started uncovering many filamentary structures associated with the jets and lobes of radio galaxies, radio relics in galaxy clusters, and tailed galaxies. Although limited theoretical investigations on the origin of the filamentary structures have associated these filaments with astrophysical shocks and interactions with intracluster magneto-ionic media, more quantitative studies are needed to ascertain their precise nature and origin. Recent MeerKAT obse…

This https://arxiv.org/abs/2502.03085 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_…

How probable is the Lyman-$α$ damping wing in the spectrum of the redshift z = 5.9896 quasar ULAS J0148+0600?
The shape of the Ly-$α$ transmission in the near zone of the redshift $z=5.9896$ quasar ULAS J0148$+$0600 (hereafter J0148) is consistent with a damping wing arising from an extended neutral hydrogen island in the diffuse intergalactic medium (IGM). Here we use simulations of late-ending reionisation from Sherwood-Relics to assess the expected incidence of quasars with Ly-$α$ and Ly-$β$ absorption similar to the observed J0148 spectrum. We find a late end to reionisation at $z=5.3$ is a nece…

Comprehensively Constraining Ultra-Light Primordial Black Holes Through Relic Formation and Early Mergers
Amirah Aljazaeri, Christian T. Byrnes
https://arxiv.org/abs/2506.16154

Comprehensively Constraining Ultra-Light Primordial Black Holes Through Relic Formation and Early Mergers
We investigate constraints on the least explored, smallest mass scales of primordial black holes (PBHs), which evaporate prior to Big Bang Nucleosynthesis (BBN). Our study examines the impact of Planck-mass relics on the allowed fraction of dark matter composed of PBHs ($f_{PBH}$), as well as on the resulting stochastic gravitational wave background and the formation of primordial binaries. We discuss how these binaries and early mergers lead to longer PBH lifetimes, extending the reach of the …