Tootfinder

To Be or not to Be: the role of rotation in modeling Galactic Be X-ray Binaries
Kyle Akira Rocha, Vicky Kalogera, Zoheyr Doctor, Jeff J. Andrews, Meng Sun, Seth Gossage, Simone S. Bavera, Tassos Fragos, Konstantinos Kovlakas, Matthias U. Kruckow, Devina Misra, Philipp M. Srivastava, Zepei Xing, Emmanouil Zapartas
https://arxiv.o…

To Be or not to Be: the role of rotation in modeling Galactic Be X-ray Binaries
Be X-ray binaries (Be-XRBs) are crucial in understanding high-mass X-ray binaries, featuring a rapidly rotating Be star and a neutron star companion in an eccentric orbit, intermittently accreting material from the Be star's decretion disk. Originating from binary stellar evolution, Be-XRBs are of significant interest to binary population synthesis (BPS) studies, encapsulating the physics of supernovae, common envelope, and mass transfer (MT). Using the POSYDON BPS code, employing pre-computed …

Background discrimination with a Micromegas detector prototype and veto system for BabyIAXO
K. Altenm\"uller, J. F. Castel, S. Cebri\'an, T. Dafni, D. D\'iez-Iba\~nez, A. Ezquerro, E. Ferrer-Ribas, J. Galan, J. Galindo, J. A. Garc\'ia, A. Giganon, C. Goblin, I. G. Irastorza, C. Loiseau, G. Luz\'on, X. F. Navick, C. Margalejo, H. Mirallas, L. Obis, A. Ortiz de Sol\'orzano, T. Papaevangelou, O. P\'erez, A. Quintana, J. Ruz, J. K. Vogel

Background discrimination with a Micromegas detector prototype and veto system for BabyIAXO
In this paper we present measurements performed with a Micromegas X-ray detector setup. The detector is a prototype in the context of the BabyIAXO helioscope, which is under construction to search for an emission of the hypothetical axion particle from the sun. An important component of such a helioscope is a low background X-ray detector with a high efficiency in the 1-10 keV energy range. The goal of the measurement was to study techniques for background discrimination. In addition to common …

The summatory function of the M\"obius function involving the greatest common divisor
Isao Kiuchi, Sumaia Saad Eddin
https://arxiv.org/abs/2403.02792 …

The summatory function of the Möbius function involving the greatest common divisor
Let $\gcd(m,n)$ denote the greatest common divisor of the positive integers $m$ and $n$, and let $μ$ represent the M\" obius function. For any real number $x>5$, we define the summatory function of the M\" obius function involving the greatest common divisor as $ S_μ(x) := \sum_{mn\leq x} μ(\gcd(m,n)). $ In this paper, we present an asymptotic formula for $S_μ(x)$. Assuming the Riemann Hypothesis, we delve further into the asymptotic behavior of $S_μ(x)$ and derive a mean square estimate f…

Distributed Artificial Intelligence as a Means to Achieve Self-X-Functions for Increasing Resilience: the First Steps
Oxana Shamilyan, Ievgen Kabin, Zoya Dyka, Peter Langendoerfer
https://arxiv.org/abs/2404.06159

Distributed Artificial Intelligence as a Means to Achieve Self-X-Functions for Increasing Resilience: the First Steps
Using sensors as a means to achieve self-awareness and artificial intelligence for decision-making, may be a way to make complex systems self-adaptive, autonomous and resilient. Investigating the combination of distributed artificial intelligence methods and bio-inspired robotics can provide results that will be helpful for implementing autonomy of such robots and other complex systems. In this paper, we describe Distributed Artificial Intelligence application area, the most common examples of …

Common neighborhood (signless) Laplacian spectrum and energy of CCC-graph
Firdous Ee Jannat, Rajat Kanti Nath
https://arxiv.org/abs/2403.02703 https://

Common neighborhood (signless) Laplacian spectrum and energy of CCC-graph
In this paper, we consider commuting conjugacy class graph (abbreviated as CCC-graph) of a finite group $G$ which is a graph with vertex set $\{x^G : x \in G \setminus Z(G)\}$ (where $x^G$ denotes the conjugacy class containing $x$) and two distinct vertices $x^G$ and $y^G$ are joined by an edge if there exist some elements $x'\in x^G$ and $y'\in y^G$ such that they commute. We compute common neighborhood (signless) Laplacian spectrum and energy of CCC-graph of finite non-abelian groups whose c…

A correlation between hard X-rays and neutrinos in radio-loud and radio-quiet AGN
Emma Kun, Imre Bartos, Julia Becker Tjus, Peter L. Biermann, Anna Franckowiak, Francis Halzen, Santiago del Palacio, Jooyun Woo
https://arxiv.org/abs/2404.06867

A correlation between hard X-rays and neutrinos in radio-loud and radio-quiet AGN
The production mechanism of astrophysical high-energy neutrinos is not yet understood. A common assumption is that beamed relativistic outflows (jets) driven by accreting black holes are needed to accelerate particles to such high energies to produce high-energy neutrinos. Indeed, the first astrophysical high-energy neutrino source candidate identified by IceCube at a significance level of $>3σ$ was a blazar -- an AGN with an accreting supermassive black hole that drives a relativistic jet dir…

Copying and pasting out of the Supreme Court opinion PDF reveals an earlier version of the title:
https://twitter.com/JakeTruscott_44/status/1764723582947475820
How is this even possible? That type of leak is common when a pre-existing PDF is edite…

Jake S. Truscott, Ph.D (@JakeTruscott_44) on X
@mjs_DC Can confirm - It's still in the metadata

Developments on frequency domain multiplexing readout for large arrays of transition-edge sensor X-ray micro-calorimeters
D. Vaccaro, H. Akamatsu, L. Gottardi, M. de Wit, M. P. Bruijn, J. van der Kuur, K. Nagayoshi, E. Taralli, K. Ravensberg, J. R. Gao, J. W. A. den Herder
https://arxiv.org/abs/2403.02989

Developments on frequency domain multiplexing readout for large arrays of transition-edge sensor X-ray micro-calorimeters
At SRON we have been developing X-ray TES micro-calorimeters as backup technology for the X-ray Integral Field Unit (X-IFU) of the Athena mission, demonstrating excellent resolving powers both under DC and AC bias. We also developed a frequency-domain multiplexing (FDM) readout technology, where each TES is coupled to a superconducting band-pass LC resonator and AC biased at MHz frequencies through a common readout line. The TES signals are summed at the input of a superconducting quantum inter…

This https://arxiv.org/abs/2307.04270 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_csLO_…

A Complete Finite Axiomatisation of the Equational Theory of Common Meadows
We analyse abstract data types that model numerical structures with a concept of error. Specifically, we focus on arithmetic data types that contain an error value $\bot$ whose main purpose is to always return a value for division. To rings and fields, we add a division operator $x/y$ and study a class of algebras called common meadows wherein $x/0 = \bot$. The set of equations true in all common meadows is named the equational theory of common meadows. We give a finite equational axiomatisatio…

Finding Diverse Strings and Longest Common Subsequences in a Graph
Yuto Shida, Giulia Punzi, Yasuaki Kobayashi, Takeaki Uno, Hiroki Arimura
https://arxiv.org/abs/2405.00131

Finding Diverse Strings and Longest Common Subsequences in a Graph
In this paper, we study for the first time the Diverse Longest Common Subsequences (LCSs) problem under Hamming distance. Given a set of a constant number of input strings, the problem asks to decide if there exists some subset $\mathcal X$ of $K$ longest common subsequences whose diversity is no less than a specified threshold $Δ$, where we consider two types of diversities of a set $\mathcal X$ of strings of equal length: the Sum diversity and the Min diversity defined as the sum and the min…

An environmental analysis of public #UAP sightings and #sky view potential: #UFOs: https://www.newswise.com/articles/the-west-is-best-to-spot-ufos - researchers identified environmental factors that explain why reports of Unidentified Anomalous Phenomena are more common in certain regions of the country.

This https://arxiv.org/abs/2211.02039 has been replaced.
link: https://scholar.google.com/scholar?q=a

The Projected Covariance Measure for assumption-lean variable significance testing
Testing the significance of a variable or group of variables $X$ for predicting a response $Y$, given additional covariates $Z$, is a ubiquitous task in statistics. A simple but common approach is to specify a linear model, and then test whether the regression coefficient for $X$ is non-zero. However, when the model is misspecified, the test may have poor power, for example when $X$ is involved in complex interactions, or lead to many false rejections. In this work we study the problem of testi…

This https://arxiv.org/abs/2309.14108 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_mat…

A Common Approach to Singular Perturbation and Homogenization II: Semilinear Elliptic Systems
We consider periodic homogenization of boundary value problems for second-order semilinear elliptic systems in 2D of the type $$ \partial_{x_i}\left(a_{ij}^{αβ}(x/\varepsilon)\partial_{x_j}u(x)+b_i^α(x,u(x))\right)=b^α(x,u(x)) \mbox{ for } x \in Ω. $$ For small $\varepsilon>0$ we prove existence of weak solutions $u=u_\varepsilon$ as well as their local uniqueness for $\|u-u_0\|_\infty \approx 0$, where $u_0$ is a given non-degenerate weak solution to the homogenized boundary val…

Ukraine: Russlands neue Vorwürfe sind Lügen
Die Ukraine weist auch die jüngsten Vorwürfe Russlands zurück, sie stecke hinter dem Anschlag auf die Konzerthalle bei Moskau. Das seien Lügen, erklärt der enge Berater des ukrainischen Präsidenten Wolodymyr Selenskyj, Mychailo Podoljak, auf dem Kurznachrichtendienst X. "Die Lügen werden offiziell verbreitet von Patruschew und danach vom FSB-Chef Bortnikow.…
🐦

Михайло Подоляк (@Podolyak_M) on X
Once again. This is now chronic. There are irrefutable facts, common (in different countries) understanding of causes and consequences, complete disbelief even by neutral countries in the "Ukrainian trace in the terrorist attack in Crocus City Hall". And nevertheless, after…

Anda, mira qué bien, el #Tesla #CyberCacharro viene con cortador de verduras incorporado, cosa que no tienen ni los Mercedes, Toyota, BMW...

AB Dor: Coronal imaging and activity cycles
Gurpreet Singh, Jeewan C. Pandey
https://arxiv.org/abs/2402.19083 https://arxiv.org/pdf/2…

AB Dor: Coronal imaging and activity cycles
Using long-term X-ray observations, we present the short-term and long-term X-ray variability analysis of the ultra-fast rotating active star AB Dor. Flaring events are common in X-ray observations of AB Dor and occupy a substantial portion of the total observation time, averaging around 57$\pm$23\%. The flare-free X-ray light curves show rotational modulation, indicating the presence of highly active regions in its corona. We have developed a light curve inversion code to image the corona of a…

More of this please !
https://x.com/bennyjohnson/status/1767967217637798021?s=61

Benny Johnson (@bennyjohnson) on X
South Carolina Rep finally SNAPS in chamber, PERFECTLY lifts veil of political corruption in middle of lion's den in two minutes🔥 “I will ALWAYS fall back on the common sense of my constituents FAR MORE than I will EVER listen to you unelected bureaucrats and other…

On free bases of Banach spaces
E. Perneck\'a, J. Sp\v{e}v\'ak
https://arxiv.org/abs/2405.03556 https://arxiv.org/pdf/2405.035…

On free bases of Banach spaces
We call a closed subset M of a Banach space X a free basis of X if it contains the null vector and every Lipschitz map from M to a Banach space Y, which preserves the null vectors can be uniquely extended to a bounded linear map from X to Y. We then say that two complete metric spaces M and N are Mol-equivalent if they admit bi-Lipschitz copies M' and N', respectively that are free bases of a common Banach space satisfying span M'=span N'. In this note, we compare Mol-equivalence with some ot…

This https://arxiv.org/abs/2309.15611 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_mat…

A common approach to singular perturbation and homogenization I: Quasilinear ODE systems
We consider periodic homogenization of boundary value problems for quasilinear second-order ODE systems in divergence form of the type $a(x,x/\varepsilon,u(x),u'(x))'= f(x,x/\varepsilon,u(x),u'(x))$ for $x \in [0,1]$. For small $\varepsilon>0$ we show existence of weak solutions $u=u_\varepsilon$ as well as their local uniqueness for $\|u-u_0\|_\infty \approx 0$, where $u_0$ is a given non-degenerate solution to the homogenized boundary value problem, and we describe the rate of conve…

ASKAP reveals the radio tail structure of the Corkscrew Galaxy shaped by its passage through the Abell 3627 cluster
B\"arbel S. Koribalski, Stefan W. Duchesne, Emil Lenc, Tiziana Venturi, Andrea Botteon, Stanislav S. Shabala, Tessa Vernstrom, Ettore Carretti, Ray P. Norris, Craig Anderson, Andrew M. Hopkins, C. J. Riseley, Nikhel Gupta, Velibor Velovi\'c, -

ASKAP reveals the radio tail structure of the Corkscrew Galaxy shaped by its passage through the Abell 3627 cluster
Among the bent tail radio galaxies common in galaxy clusters are some with long, collimated tails (so-called head-tail galaxies) shaped by their interactions with the intracluster medium (ICM). Here we report the discovery of intricate filamentary structure in and beyond the ~28' (570 kpc) long, helical radio tail of the Corkscrew Galaxy (1610-60.5, ESO137-G007), which resides in the X-ray bright cluster Abell 3627 (D = 70 Mpc). Deep radio continuum data were obtained with wide-field Phased Arr…

Finding Diverse Strings and Longest Common Subsequences in a Graph
Yuto Shida, Giulia Punzi, Yasuaki Kobayashi, Takeaki Uno, Hiroki Arimura
https://arxiv.org/abs/2405.00131

Finding Diverse Strings and Longest Common Subsequences in a Graph
In this paper, we study for the first time the Diverse Longest Common Subsequences (LCSs) problem under Hamming distance. Given a set of a constant number of input strings, the problem asks to decide if there exists some subset $\mathcal X$ of $K$ longest common subsequences whose diversity is no less than a specified threshold $Δ$, where we consider two types of diversities of a set $\mathcal X$ of strings of equal length: the Sum diversity and the Min diversity defined as the sum and the min…

The $3k-4$ Theorem modulo a Prime: High Density for $A B$
David J. Grynkiewicz
https://arxiv.org/abs/2402.15028 https://arxiv.org/pdf…

The $3k-4$ Theorem modulo a Prime: High Density for $A+B$
The $3k-4$ Theorem asserts that, if $A,\,B\subseteq \mathbb Z$ are finite, nonempty subsets with $|A|\geq |B|$ and $|A+B|=|A|+|B|+r< |A|+2|B|-3$, then there are arithmetic progressions $P_A$ and $P_B$ of common difference with $X\subseteq P_X$ with $|P_X|\leq |X|+r+1$ for all $X\in \{A,B\}$. There is much progress extending this result to $\mathbb Z/p\mathbb Z$ with $p\geq 2$ prime. Here we begin by showin…

AB Dor: Coronal imaging and activity cycles
Gurpreet Singh, Jeewan C. Pandey
https://arxiv.org/abs/2402.19083 https://arxiv.org/pdf/2…

AB Dor: Coronal imaging and activity cycles
Using long-term X-ray observations, we present the short-term and long-term X-ray variability analysis of the ultra-fast rotating active star AB Dor. Flaring events are common in X-ray observations of AB Dor and occupy a substantial portion of the total observation time, averaging around 57$\pm$23\%. The flare-free X-ray light curves show rotational modulation, indicating the presence of highly active regions in its corona. We have developed a light curve inversion code to image the corona of a…

Doofus: "I'd never let my teenage child date someone X years old!!!!"
Common Sense: "LOL! Hypothetical parents pretending they have hypothetical control over hypothetical sons and daughters who are young adults aged 14-19! (pro-tip: peeps do stuff. you don't have control)"

Efficiently Computing Similarities to Private Datasets
Arturs Backurs, Zinan Lin, Sepideh Mahabadi, Sandeep Silwal, Jakub Tarnawski
https://arxiv.org/abs/2403.08917

Efficiently Computing Similarities to Private Datasets
Many methods in differentially private model training rely on computing the similarity between a query point (such as public or synthetic data) and private data. We abstract out this common subroutine and study the following fundamental algorithmic problem: Given a similarity function $f$ and a large high-dimensional private dataset $X \subset \mathbb{R}^d$, output a differentially private (DP) data structure which approximates $\sum_{x \in X} f(x,y)$ for any query $y$. We consider the cases wh…

Heterogeneous sapphire-supported low-loss photonics platform
Yubo Wang, Yu Guo, Yiyu Zhou, Hao Xie, Hong X. Tang
https://arxiv.org/abs/2405.03088 https://<…

Heterogeneous sapphire-supported low-loss photonics platform
Sapphire is a promising wideband substrate material for visible photonics. It is a common growth substrate for III-nitride light-emitting diodes and laser structures. Doped sapphires are important gain media foundational to the development of titanium-sapphire and ruby lasers. For lasers operating at visible and near-infrared wavelengths, a photonic platform that minimizes loss while maximizing gain material overlap is crucial. Here, we introduce a novel low-loss waveguiding strategy that estab…

This https://arxiv.org/abs/1611.09250 has been replaced.
link: https://scholar.google.com/scholar?q=a

The $q-$Onsager algebra and multivariable $q-$special functions
Two sets of mutually commuting $q-$difference operators $x_i$ and $y_j$, $i,j=1, ...,N$ such that $x_i$ and $y_i$ generate a homomorphic image of the $q-$Onsager algebra for each $i$ are introduced. The common polynomial eigenfunctions of each set are found to be entangled product of elementary Pochhammer functions in $N$ variables and $N+3$ parameters. Under certain conditions on the parameters, they form two `dual' bases of polynomials in $N$ variables. The action of each operator with respec…

This https://arxiv.org/abs/2310.20283 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_mat…

Estimates of stability with respect to the number of summands for distributions of successive sums of independent identically distributed vectors
Let $X_1,\dots, X_n,\dots$ be i.i.d.\ $d$-dimensional random vectors with common distribution $F$. Then $S_n = X_1+\dots+X_n$ has distribution $F^n$ (degree is understood in the sense of convolution). Let $$ ρ_{\mathcal{C}_d}(F,G) = \sup_A |F\{A\} - G\{A\}|, $$ where the supremum is taken over all convex subsets of $\mathbb R^d$. Basic result is as follows. For any nontrivial distribution $F$ there is $c_1(F)$ such that $$ ρ_{\mathcal{C}_d}(F^n, F^{n+1})\leq \frac{c_1(F)}{\sqrt n} $…

Local pairing versus bulk superconductivity intertwined by the charge density wave order in Cs(V$_{1-x}$Ta$_{x}$)$_{3}$Sb$_{5}$
Jinyulin Li, Qing Li, Jinjin Liu, Ying Xiang, Huan Yang, Zhiwei Wang, Yugui Yao, Hai-Hu Wen
https://arxiv.org/abs/2404.11131

Local pairing versus bulk superconductivity intertwined by the charge density wave order in Cs(V$_{1-x}$Ta$_{x}$)$_{3}$Sb$_{5}$
There is a common belief that superconductivity and charge density wave (CDW) order accommodate homogenously in real space but compete with each other for the effective density of states in momentum space in CDW superconductors. By measuring resistivity along the $c$-axis in Cs(V$_{1-x}$Ta$_{x}$)$_{3}$Sb$_{5}$, we observe strong superconducting fluctuation behavior coexisting with the CDW order in the pristine CsV$_{3}$Sb$_{5}$, and the fluctuation region becomes narrowed when the Ta doping sup…

Possible X-ray Cocoon Emission from GRB 050709
Naoki Ogino, Makoto Arimoto, Hamid Hamidani, Takanori Sakamoto, Daisuke Yonetoku, Tatsuya Sawano, Motoko Serino, Katsuaki Asano, Nobuyuki Kawai
https://arxiv.org/abs/2404.02627

Possible X-ray Cocoon Emission from GRB 050709
The detection of the short gamma-ray burst (SGRB) 050709 by the HETE-2 satellite opened a new window into understanding the nature of SGRBs, offering clues about their emission mechanism and progenitors, with the crucial aid of optical follow-up observations. Here, we revisit the prompt emission of GRB 050709. Our analysis reveals an initial hard spike ~200 ms long, followed by a subsequent soft tail emission lasting ~300 ms. These components could be common among other SGRBs originating from b…

This https://arxiv.org/abs/2309.14108 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_mat…

A Common Approach to Singular Perturbation and Homogenization II: Semilinear Elliptic Systems
We consider periodic homogenization of boundary value problems for second-order semilinear elliptic systems in 2D of the type $$ \partial_{x_i}\left(a_{ij}^{αβ}(x/\varepsilon)\partial_{x_j}u(x)+b_i^α(x,u(x))\right)=b^α(x,u(x)) \mbox{ for } x \in Ω. $$ For small $\varepsilon>0$ we prove existence of weak solutions $u=u_\varepsilon$ as well as their local uniqueness for $\|u-u_0\|_\infty \approx 0$, where $u_0$ is a given non-degenerate weak solution to the homogenized boundary val…

Consequences of a low-mass, high-pressure, star formation mode in early galaxies
A. C. Fabian, J. S. Sanders, G. J. Ferland, B. R. McNamara, C. Pinto, S. A. Walker
https://arxiv.org/abs/2405.01865

Consequences of a low-mass, high-pressure, star formation mode in early galaxies
High resolution X-ray spectra reveal hidden cooling flows depositing cold gas at the centres of massive nearby early-type galaxies with little sign of normal star formation. Optical observations are revealing that a bottom-heavy Initial Mass Function is common within the inner kpc of similar galaxies. We revive the possibility that a low-mass star formation mode is operating due to the high thermal pressure in the cooling flow, thus explaining the accumulation of low-mass stars. We further expl…

Doofus: "I'd never let my teenage child date someone X years old!!!!"
Common Sense: "LOL! Hypothetical parents pretending they have hypothetical control over hypothetical sons and daughters who are young adults aged 14-19! (pro-tip: peeps do stuff. you don't have control)"

This https://arxiv.org/abs/2402.05204 has been replaced.
link: https://scholar.google.com/scholar?q=a

Electron beam emittance at operational intensity in fourth-generation synchrotron light sources
For synchrotron light sources, the brightness of user X-ray beams is primarily determined by the electron beam emittance and energy spread at operational intensity. A common feature of fourth-generation synchrotrons is the short length of electron bunches combined with a very small transverse beam size. Consequently, the particle density is much higher than in machines of previous generations, leading to strong collective effects that significantly increase the emittance and limit the achievabl…

This https://arxiv.org/abs/1611.09250 has been replaced.
link: https://scholar.google.com/scholar?q=a

The $q-$Onsager algebra and multivariable $q-$special functions
Two sets of mutually commuting $q-$difference operators $x_i$ and $y_j$, $i,j=1, ...,N$ such that $x_i$ and $y_i$ generate a homomorphic image of the $q-$Onsager algebra for each $i$ are introduced. The common polynomial eigenfunctions of each set are found to be entangled product of elementary Pochhammer functions in $N$ variables and $N+3$ parameters. Under certain conditions on the parameters, they form two `dual' bases of polynomials in $N$ variables. The action of each operator with respec…

Hitting Meets Packing: How Hard Can it Be?
Jacob Focke, Fabian Frei, Shaohua Li, D\'aniel Marx, Philipp Schepper, Roohani Sharma, Karol W\k{e}grzycki
https://arxiv.org/abs/2402.14927

Hitting Meets Packing: How Hard Can it Be?
We study a general family of problems that form a common generalization of classic hitting (also referred to as covering or transversal) and packing problems. An instance of X-HitPack asks: Can removing k (deletable) vertices of a graph G prevent us from packing $\ell$ vertex-disjoint objects of type X? This problem captures a spectrum of problems with standard hitting and packing on opposite ends. Our main motivating question is whether the combination X-HitPack can be significantly harder tha…

This https://arxiv.org/abs/2204.03226 has been replaced.
link: https://scholar.google.com/scholar?q=a

On the monogenity of quartic number fields defined by $x^4+ax^2+b$
For any quartic number field $K$ generated by a root $α$ of an irreducible trinomial of type $x^4+ax^2+b\in Z[x]$, we characterize when $Z[α]$ is integrally closed. Also for $p=2,3$, we explicitly give the highest power of $p$ dividing $i(K)$, the common index divisor of $K$. For a wide class of monogenic trinomials of this type we prove that up to equivalence there is only one generator of power integral bases in $K=Q(α)$. We illustrate our statements with a series of examples.

Temperature and Tautomeric Effects in High-Resolution Oxygen 1s X-ray Photoelectron Spectroscopy of Purines and Pyrimidines
Minrui Wei, Junxiang Zuo, Guangjun Tian, Weijie Hua
https://arxiv.org/abs/2403.09109

Temperature and Tautomeric Effects in High-Resolution Oxygen 1s X-ray Photoelectron Spectroscopy of Purines and Pyrimidines
Purines and pyrimidines, crucial building blocks in biological systems, have attracted significant interest across molecular physics, biochemistry, pharmacology, and chemistry. Extensive spectroscopies have been employed for characterization, while the temperature and potential tautomeric effects can complicate the interpretation of underlying physics and chemistry. Here, we conducted first-principles simulations to analyze the vibrationally-resolved O1s X-ray photoelectron spectra of 6 common …

Hitting Meets Packing: How Hard Can it Be?
Jacob Focke, Fabian Frei, Shaohua Li, D\'aniel Marx, Philipp Schepper, Roohani Sharma, Karol W\k{e}grzycki
https://arxiv.org/abs/2402.14927

Hitting Meets Packing: How Hard Can it Be?
We study a general family of problems that form a common generalization of classic hitting (also referred to as covering or transversal) and packing problems. An instance of X-HitPack asks: Can removing k (deletable) vertices of a graph G prevent us from packing $\ell$ vertex-disjoint objects of type X? This problem captures a spectrum of problems with standard hitting and packing on opposite ends. Our main motivating question is whether the combination X-HitPack can be significantly harder tha…

Sharp phase transitions in high-dimensional changepoint detection
Daniel Xiang, Chao Gao
https://arxiv.org/abs/2403.11704 https://arx…

Sharp phase transitions in high-dimensional changepoint detection
We study a hypothesis testing problem in the context of high-dimensional changepoint detection. Given a matrix $X \in \mathbb{R}^{p \times n}$ with independent Gaussian entries, the goal is to determine whether or not a sparse, non-null fraction of rows in $X$ exhibits a shift in mean at a common index between $1$ and $n$. We focus on three aspects of this problem: the sparsity of non-null rows, the presence of a single, common changepoint in the non-null rows, and the signal strength associate…

This https://arxiv.org/abs/2401.01707 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_…

Explaining supernova remnant G352.7-0.1 as a peculiar type Ia supernova inside a planetary nebula
I identify a point-symmetric morphology of the supernova remnant (SNR) G352.7-0.1 and propose that the outer axially-symmetric structure is the remnant of a common envelope evolution (CEE) of the progenitor system, while the inner structure is the ejecta of a thermonuclear explosion triggered by the merger of a white dwarf (WD) and the core of an asymptotic giant branch (AGB) star. The main radio structure of SNR G352.7-0.1 forms an outer (large) ellipse. The bright X-ray emitting gas forms a s…

Rotation and flipping invariant self-organizing maps with astronomical images: A cookbook and application to the VLA Sky Survey QuickLook images
A. N. Vantyghem, T. J. Galvin, B. Sebastian, C. P. O'Dea, Y. A. Gordon, M. Boyce, L. Rudnick, K. Polsterer, Heinz Andernach, M. Dionyssiou, P. Venkataraman, R. Norris, S. A. Baum, X. R. Wang, M. Huynh
ht…

Rotation and flipping invariant self-organizing maps with astronomical images: A cookbook and application to the VLA Sky Survey QuickLook images
Modern wide field radio surveys typically detect millions of objects. Techniques based on machine learning are proving to be useful for classifying large numbers of objects. The self-organizing map (SOM) is an unsupervised machine learning algorithm that projects a many-dimensional dataset onto a two- or three-dimensional lattice of neurons. This dimensionality reduction allows the user to visualize common features of the data better and develop algorithms for classifying objects that are not o…