Tootfinder

Effective interactions of the open bosonic string via field theory
Lucia Garozzo, Alfredo Guevara
https://arxiv.org/abs/2402.19430 https://

Effective interactions of the open bosonic string via field theory
We describe a method to extract an effective Lagrangian description for open bosonic strings, at zero transcendentality. The method relies on a particular formulation of its scattering amplitudes derived from color-kinematics duality. More precisely, starting from a $(DF)^2 + \text{YM}$ quantum field theory, we integrate out all the massive degrees of freedom to generate an expansion in the inverse string tension $α^\prime$. We explicitly compute the Lagrangian terms through $\mathcal{O}(α^{\…

Chess grandmaster Garry Kasparov was arrested, in absentia, by Russia for creating and leading a "terrorist" group. This group, the Renew Democracy Initiative, tweeted that this "means he's been especially effective in fighting for freedom"
His own statement was great as well:
https://bird.makeup/users/kasparov63/statuses/1783222690213457930

Neutrinos in Cosmology
Eleonora Di Valentino, Stefano Gariazzo, Olga Mena
https://arxiv.org/abs/2404.19322 https://arxiv.org/pdf/2404…

Neutrinos in Cosmology
Neutrinos are the least known particle in the Standard Model of elementary particle physics. They play a crucial role in cosmology, governing the universe's evolution and shaping the large-scale structures we observe today. In this chapter, we review crucial topics in neutrino cosmology, such as the neutrino decoupling process in the very early universe. We shall also revisit the current constraints on the number of effective relativistic degrees of freedom and the departures from its standard …

This https://arxiv.org/abs/2304.12242 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_hept…

Fracton-elasticity duality on curved manifolds
The mechanical properties of crystals on curved substrates mix elastic, geometric and topological degrees of freedom. In order to elucidate the properties of such crystals we formulate the low-energy effective action that combines metric degrees of freedom with displacement fields and defects. We propose dualities for elasticity coupled to curved geometry formulated in terms of tensor gauge theories. We show that the metric degrees of freedom, evolving akin to linearized gravity are mapped to t…

This https://arxiv.org/abs/2310.07822 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_csRO_…

Body-mounted MR-conditional Robot for Minimally Invasive Liver Intervention
MR-guided microwave ablation (MWA) has proven effective in treating hepatocellular carcinoma (HCC) with small-sized tumors, but the state-of-the-art technique suffers from sub-optimal workflow due to speed and accuracy of needle placement. This paper presents a compact body-mounted MR-conditional robot that can operate in closed-bore MR scanners for accurate needle guidance. The robotic platform consists of two stacked Cartesian XY stages, each with two degrees of freedom, that facilitate needl…

Raptor: Distributed Scheduling for Serverless Functions
Kevin Exton, Maria Read
https://arxiv.org/abs/2403.16457 https://arxiv.org/pd…

Raptor: Distributed Scheduling for Serverless Functions
Serverless platforms that poorly schedule function requests inspire developers to implement workarounds to issues like high cold start latencies, poor fault tolerance, and limited support for parallel processing. These solutions litter environments with idle containers and add unnecessary pressure to the already underperforming scheduling services. An effective serverless scheduling policy should encourage developers to write small and reusable snippets of code, and give operators the freedom t…

Exciton-activated effective phonon magnetic moment in monolayer MoS2
Chunli Tang, Gaihua Ye, Cynthia Nnokwe, Mengqi Fang, Li Xiang, Masoud Mahjouri-Samani, Dmitry Smirnov, Eui-Hyeok Yang, Tingting Wang, Lifa Zhang, Rui He, Wencan Jin
https://arxiv.org/abs/2403.15347

Exciton-activated effective phonon magnetic moment in monolayer MoS2
Optical excitation of chiral phonons plays a vital role in studying the phonon-driven magnetic phenomena in solids. Transition metal dichalcogenides host chiral phonons at high symmetry points of the Brillouin zone, providing an ideal platform to explore the interplay between chiral phonons and valley degree of freedom. Here, we investigate the helicity-resolved magneto-Raman response of monolayer MoS2 and identify a doubly degenerate Brillouin-zone-center chiral phonon mode at ~270 cm-1. Our w…

EFF Helps News Organizations Push Back Against Legal Bullying from Cyber Mercenary Group
https://www.eff.org/deeplinks/2024/02/eff-helps-news-organizations-resist-legal-bullying-cyber-mercenary-group

EFF Helps News Organizations Push Back Against Legal Bullying from Cyber Mercenary Group
Cyber mercenaries present a grave threat to human rights and freedom of expression. They have been implicated in surveillance, torture, and even murder of human rights defenders, political candidates, and journalists. One of the most effective ways that the human rights community pushes back...

This https://arxiv.org/abs/2311.08942 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_ees…

Thermally-Resilient Soft Gripper for On-Orbit Operations
Research in soft manipulators has significantly enhanced object grasping capabilities, thanks to their adaptability to various shapes and sizes. Applying this technology to on-orbit servicing, especially during the capture and containment stages of active space debris removal missions, might offer a secure, adaptable, and cost-effective solution compared to the trend of increasing the degrees of freedom and complexity of the manipulator (e.g. ClearSpace, Astroscale). This work aims to conduct a…

This https://arxiv.org/abs/2402.02394 has been replaced.
link: https://scholar.google.com/scholar?q=a

Frustration - no frustration crossover and phase transitions in 2D spin models with zig-zag structure
Three 2D spin models made of frustrated zig-zag chains with competing interactions which by exact summation with respect to some degrees of freedom can be replaced by an effective temperature-dependent interaction were considered. The first model, exactly solvable Ising chains coupled by only four-spin interactions does not exhibit any finite temperature phase transition, nevertheless temperature can trigger a frustration - no frustration crossover accompanied by gigantic specific heat. A simil…

Nearly-optimal effective stability estimates around Diophantine tori of H\"older Hamiltonians
Santiago Barbieri, Gerard Farr\'e
https://arxiv.org/abs/2402.10764

Nearly-optimal effective stability estimates around Diophantine tori of Hölder Hamiltonians
We prove that the solutions of Hölder-differentiable Hamiltonian systems, associated to initial conditions in a small ball of radius $ρ>0$ around a Lagrangian, $(γ,τ)-$Diophantine, quasi-periodic torus, are stable over a time $t^{\text{stab}}\simeq 1/(|ρ|^{1+\frac{\ell-1}{τ+1}}|\ln ρ|^{\ell-1})$, where $\ell>2d+1, \ell \in \mathbb R$, is the regularity, and $d$ is the number of degrees of freedom. In the finitely differentiable case (for integer $\ell$), this result i…

Raptor: Distributed Scheduling for Serverless Functions
Kevin Exton, Maria Read
https://arxiv.org/abs/2403.16457 https://arxiv.org/pd…

Raptor: Distributed Scheduling for Serverless Functions
Serverless platforms that poorly schedule function requests inspire developers to implement workarounds to issues like high cold start latencies, poor fault tolerance, and limited support for parallel processing. These solutions litter environments with idle containers and add unnecessary pressure to the already underperforming scheduling services. An effective serverless scheduling policy should encourage developers to write small and reusable snippets of code, and give operators the freedom t…

This https://arxiv.org/abs/2309.12087 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_grqc_…

Scalaron dynamics from UV to IR
We consider a scenario where the scalaron of $f({\cal R})$ models is related to the volume modulus of string compactifications leaving only one scalar degree of freedom at low energy. The coefficient of the leading curvature squared contribution to the low energy effective action of gravity determines the mass of the scalaron. We impose that this mass is small enough to allow for the scalaron to drive Starobinski's inflation. After inflation, the renormalisation group evolution of the couplings…

This https://arxiv.org/abs/2201.03038 has been replaced.
link: https://scholar.google.com/scholar?q=a

Effects of squared four-fermion operators of the Standard Model Effective Field Theory on meson mixing
The Standard Model Effective Field Theory (SMEFT) is a universal way of parametrizing New Physics (NP) manifesting as new, heavy particle interactions with the Standard Model (SM) degrees of freedom, that respect the SM gauged symmetries. Higher order terms in the NP interactions possibly lead to sizable effects, mandatory for meaningful phenomenological studies, such as contributions to neutral meson mixing, which typically pushes the scale of NP to energy scales much beyond the reach of direc…

Exciton-activated effective phonon magnetic moment in monolayer MoS2
Chunli Tang, Gaihua Ye, Cynthia Nnokwe, Mengqi Fang, Li Xiang, Masoud Mahjouri-Samani, Dmitry Smirnov, Eui-Hyeok Yang, Tingting Wang, Lifa Zhang, Rui He, Wencan Jin
https://arxiv.org/abs/2403.15347

Exciton-activated effective phonon magnetic moment in monolayer MoS2
Optical excitation of chiral phonons plays a vital role in studying the phonon-driven magnetic phenomena in solids. Transition metal dichalcogenides host chiral phonons at high symmetry points of the Brillouin zone, providing an ideal platform to explore the interplay between chiral phonons and valley degree of freedom. Here, we investigate the helicity-resolved magneto-Raman response of monolayer MoS2 and identify a doubly degenerate Brillouin-zone-center chiral phonon mode at ~270 cm-1. Our w…

This https://arxiv.org/abs/2304.02050 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_qu…

Criticality-enhanced Electric Field Gradient Sensor with Single Trapped Ions
We propose and analyze a driven-dissipative quantum sensor that is continuously monitored close to a dissipative critical point. The sensor relies on the critical open Rabi model with the spin and phonon degrees of freedom of a single trapped ion to achieve criticality-enhanced sensitivity. Effective continuous monitoring of the sensor is realized via a co-trapped ancilla ion that switches between dark and bright internal states conditioned on a `jump' of the phonon population which, remarkably…

Dark Radiation with Baryon Acoustic Oscillations from DESI 2024 and the $H_0$ tension
Itamar J. Allali, Alessio Notari, Fabrizio Rompineve
https://arxiv.org/abs/2404.15220

Dark Radiation with Baryon Acoustic Oscillations from DESI 2024 and the $H_0$ tension
We investigate the presence of extra relativistic degrees of freedom in the early Universe, contributing to the effective number of neutrinos $N_\text{eff}$, as $ΔN_\text{eff}\equiv N_\text{eff}-3.044\geq 0$, in light of the recent measurements of Baryon Acoustic Oscillations (BAO) by the DESI collaboration. We analyze one-parameter extensions of the $Λ$CDM model where dark radiation (DR) is free streaming or behaves as a perfect fluid, due to self-interactions. We report a significant relaxa…

This https://arxiv.org/abs/2403.11698 has been replaced.
initial toot: https://mastoxiv.page/@arX…

Spin-Orbital Ordering in Alkali Superoxides
Akali superoxides AO2 (A=Na, K, Rb, Cs), due to an open p shell of the oxygen ion O2^- with degenerate pi orbitals, have spin and orbital degrees of freedom. The complex magnetic, orbital, and structural phase transitions observed experimentally in this family of materials are only partially understood. Based on density functional theory, we derive a strong-coupling effective model for the isostructural compounds AO2 (A=K, Rb, Cs) from a two-orbital Hubbard model. We find that CsO2 has highly f…

Spatiotemporal Control of Ultrafast Pulses in Multimode Optical Fibers
Daniel Cruz-Delgado, J. Enrique Antonio-Lopez, Armando Perez-Leija, Nicolas K. Fontaine, Stephen S. Eikenberry, Demetrios N. Christodoulides, Miguel A. Bandres, Rodrigo Amezcua-Correa
https://arxiv.org/abs/2402.11783 …

Spatiotemporal Control of Ultrafast Pulses in Multimode Optical Fibers
Multimode optical fibers represent the ideal platform for transferring multidimensional light states. However, dispersion degrades the correlations between the light's degrees of freedom, thus limiting the effective transport of ultrashort pulses between distant nodes of optical networks. Here, we demonstrate that tailoring the spatiotemporal structure of ultrashort light pulses can overcome the physical limitations imposed by both chromatic and modal dispersion in multimode optical fibers. We …

This https://arxiv.org/abs/2305.19321 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_hept…

Chaotic LLM billiards
We study null geodesics of the ten-dimensional LLM geometries. In particular, we show that there are a subset of these null geodesics that are confined to the LLM plane. The effective dynamics of these in-plane geodesics is that of a Hamiltonian system with two degrees of freedom (a phase space of dimension 4). We show that these are chaotic. In the two-coloring of the LLM plane, if they start in the empty region, they cannot penetrate the filled region and viceversa. The dynamical problem is t…

Stochastic Thermodynamics at the Quantum-Classical Boundary: A Self-Consistent Framework Based on Adiabatic-Response Theory
Joshua Eglinton, Federico Carollo, Igor Lesanovsky, Kay Brandner
https://arxiv.org/abs/2404.10118

Stochastic Thermodynamics at the Quantum-Classical Boundary: A Self-Consistent Framework Based on Adiabatic-Response Theory
Microscopic thermal machines promise to play an important role in future quantum technologies. Making such devices widely applicable will require effective strategies to channel their output into easily accessible storage systems like classical degrees of freedom. Here, we develop a self-consistent theoretical framework that makes it possible to model such quantum-classical hybrid devices in a thermodynamically consistent manner. Our approach is based on the assumption that the quantum part of …

This https://arxiv.org/abs/2312.13946 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_qu…

Hybrid classical-quantum systems in terms of moments
We present a consistent formalism to describe the dynamics of hybrid systems with mixed classical and quantum degrees of freedom. The probability function of the system, which, in general, will be a combination of the classical distribution function and the quantum density matrix, is described in terms of its corresponding moments. We then define a hybrid Poisson bracket, such that the dynamics of the moments is ruled by an effective Hamiltonian. In particular, a closed formula for the Poisson …

A Semi-blind Reconstruction of the History of Effective Number of Neutrinos Using CMB Data
Sarah Safi, Marzieh Farhang, Olga Mena, Eleonora Di Valentino
https://arxiv.org/abs/2404.01457

A Semi-blind Reconstruction of the History of Effective Number of Neutrinos Using CMB Data
We explore the possibility of redshift-dependent deviations in the contribution of relativistic degrees of freedom to the radiation budget of the cosmos, conventionally parameterized by the effective number of neutrinos $N_{\rm eff}$, from the predictions of the standard model. We expand the deviations $ΔN_{\rm eff}(z)$ in terms of top-hat functions and treat their amplitudes as the free parameters of the theory to be measured alongside the standard cosmological parameters by the Planck measur…

This https://arxiv.org/abs/2311.05571 has been replaced.
initial toot: https://mastoxiv.page/@ar…

Effective Data-Driven Collective Variables for Free Energy Calculations from Metadynamics of Paths
A variety of enhanced sampling methods predict multidimensional free energy landscapes associated with biological and other molecular processes as a function of a few selected collective variables (CVs). The accuracy of these methods is crucially dependent on the ability of the chosen CVs to capture the relevant slow degrees of freedom of the system. For complex processes, finding such CVs is the real challenge. Machine learning (ML) CVs offer, in principle, a solution to handle this problem. H…

This https://arxiv.org/abs/2403.19909 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_hept…

Multivalued (Wess-Zumino-Novikov) Functional in Fluid Mechanics
We introduce hydrodynamics derived from the action of a perfect fluid deformed by the Novikov multivalued functional generated by combined actions of gauge transformations and spacetime diffeomorphisms. This deformation is structured analogously to the Wess-Zumino functional, commonly used as an effective description of field theories with the chiral anomaly. The deformation affects the continuity equation giving fluid spin degrees of freedom and is consistent with the kinematics of the chiral …

Spin-Orbital Ordering in Alkali Superoxides
Kohei Shibata, Makoto Naka, Harald O. Jeschke, Junya Otsuki
https://arxiv.org/abs/2403.11698 https://

Spin-Orbital Ordering in Alkali Superoxides
Akali superoxides AO2 (A=Na, K, Rb, Cs), due to an open p shell of the oxygen ion O2^- with degenerate pi orbitals, have spin and orbital degrees of freedom. The complex magnetic, orbital, and structural phase transitions observed experimentally in this family of materials are only partially understood. Based on density functional theory, we derive a strong-coupling effective model for the isostructural compounds AO2 (A=K, Rb, Cs) from a two-orbital Hubbard model. We find that CsO2 has highly f…

This https://arxiv.org/abs/2403.15347 has been replaced.
initial toot: https://mastoxiv.page/@a…

Exciton-activated effective phonon magnetic moment in monolayer MoS2
Optical excitation of chiral phonons plays a vital role in studying the phonon-driven magnetic phenomena in solids. Transition metal dichalcogenides host chiral phonons at high symmetry points of the Brillouin zone, providing an ideal platform to explore the interplay between chiral phonons and valley degree of freedom. Here, we investigate the helicity-resolved magneto-Raman response of monolayer MoS2 and identify a doubly degenerate Brillouin-zone-center chiral phonon mode at ~270 cm-1. Our w…

This https://arxiv.org/abs/2309.05285 has been replaced.
initial toot: https://mastoxiv.page/@a…

Effects of strain-tunable valleys on charge transport in bismuth
The manipulation of the valley degree of freedom can boost the technological development of novel functional devices based on valleytronics. The current mainstream platform for valleytronics is to produce a monolayer with inversion asymmetry, in which the strain-band engineering through the substrates can serve to improve the performance of valley-based devices. However, pinpointing the effective role of strain is inevitable for the precise design of the desired valley structure. Here, we demon…