Miracle-dz/UniFAR-FTUs huggingface dataset:
Dark Matter annihilation energy output and its effects on the high-z IGM

We study the case of DM self annihilation, in order to assess its importance as an energy injection mechanism, to the IGM in general, and to the medium within particular DM haloes. We consider thermal relic WIMP particles with masses of 10GeV and 1TeV and we analyse in detail the clustering properties of DM in a $\Lambda$CDM cosmology, on all hierarchy levels, from haloes and their mass function, to subhaloes and the DM density profiles within them, considering adiabatic contraction by the presence of a SMBH. We then compute the corresponding energy output, concluding that DM annihilation does not constitute an important feedback mechanism. We also calculate the effects that DM annihilation has on the IGM temperature and ionization fraction, and we find that assuming maximal energy absorption, at z ~ 10, for the case of a 1TeV WIMP, the ionization fraction could be raised to $6 \times 10^{-4}$ and the temperature to 10K, and in the case of a 10GeV WIMP, the IGM temperature could be raised to 200K and the ionization fraction to $8 \times 10^{-3}$. We conclude that DM annihilations cannot be regarded as an alternative reionization scenario. Regarding the detectability of the WIMP through the modifications to the 21 cm differential brightness temperature signal ($\delta$Tb), we conclude that a thermal relic WIMP with mass of 1TeV is not likely to be detected from the global signal alone, except perhaps at the 1-3mK level in the frequency range 30MHz < $\nu$ < 35MHz corresponding to 40 < z < 46. However, a 10GeV mass WIMP may be detectable at the 1-3mK level in the frequency range 55MHz < $\nu$ < 119MHz corresponding to 11 < z < 25, and at the 1-10mK level in the frequency range 30MHz < $\nu$ < 40MHz corresponding to 35 < z < 46.
Factors Associated with Premenstrual Syndrome: A Cross-Sectional Study of Female Adolescents (Morocco)

Background: Premenstrual syndrome (PMS) is a heterogeneous disorder which includes physical and affective symptoms that most females of reproductive age experience during the luteal phase of their menstrual cycle. Objective: This study aims to investigate the factors associated with PMS among adolescent schoolgirls and to assess the severity of PMS. Methods: A cross sectional study conducted among 102 adolescents representing Marrakesh city. A structured questionnaire was used. Data analysis was done with SPSS version 26. Results: The rate of mild to severe PMS were 52.9 %, 25.5 % and 21.6 % respectively. The most common physical symptoms were backache (52.9%) and breast tenderness (36.3%), while the most common affective symptoms were irritability (49 %), anxiety (46.1 %) and mood swelling (45.1 %). Significant differences were observed between PMS group and non-PMS group in level of education (p< 0.05), sweets consumption (p< 0.05) and family’s status (p< 0.05). There was no significant association between PMS and BMI. Conclusion: Based on the findings, it seems that the occurrence of PMS is associated with sweet consumption frequency. This study showed also that the most common PMS symptoms were irritability and backache.
Using galaxy–galaxy weak lensing measurements to correct the finger of God

For decades, cosmologists have been using galaxies to trace the large-scale distribution of matter. At present, the largest source of systematic uncertainty in this analysis is the challenge of modelling the complex relationship between galaxy redshift and the distribution of dark matter. If all galaxies sat in the centres of haloes, there would be minimal finger-of-God (FoG) effects and a simple relationship between the galaxy and matter distributions. However, many galaxies, even some of the luminous red galaxies (LRGs), do not lie in the centres of haloes. Because the galaxy–galaxy lensing is also sensitive to the off-centred galaxies, we show that we can use the lensing measurements to determine the amplitude of this effect and to determine the expected amplitude of FoG effects. We develop an approach for using the lensing data to model how the FoG suppresses the power spectrum amplitudes and show that the current data imply a 30 per cent suppression at wavenumber k = 0.2 h Mpc−1. Our analysis implies that it is important to complement a spectroscopic survey with an imaging survey with sufficient depth and wide field coverage. Joint imaging and spectroscopic surveys allow a robust, unbiased use of the power spectrum amplitude information: it improves the marginalized error of growth rate fg≡ d ln D/d ln a by up to a factor of 2 over a wide range of redshifts z < 1.4. We also find that the dark energy equation-of-state parameter, w0, and the neutrino mass, fν, can be unbiasedly constrained by combining the lensing information, with an improvement of 10–25 per cent compared to a spectroscopic survey without lensing calibration.
Uncovering mass segregation with galaxy analogues in dark-matter simulations

We investigate mass segregation in group and cluster environments by identifying galaxy analogues in high-resolution dark matter simulations. Subhalos identified by the AHF and ROCKSTAR halo finders have similar mass functions, independent of resolution, but different radial distributions due to significantly different subhalo hierarchies. We propose a simple way to classify subhalos as galaxy analogues. The radial distributions of galaxy analogues agree well at large halo-centric radii for both AHF and ROCKSTAR but disagree near parent halo centres where the phase-space information used by ROCKSTAR is essential. We see clear mass segregation at small radii (within $0.5\,r_{vir}$) with average galaxy analogue mass decreasing with radius. Beyond the virial radius, we find a mild trend where the average galaxy analogue mass increases with radius. These mass segregation trends are strongest in small groups and dominated by the segregation of low mass analogues. The lack of mass segregation in massive galaxy analogues suggests that the observed trends are driven by the complex accretion histories of the parent halos rather than dynamical friction.
Quarterly Earnings Guidance and Real Earnings Management

We examine if quarterly earnings guidance induces real earnings management. Quarterly guidance may cause myopia and inefficient decision-making, if managers become overly concerned with setting and beating short-term earnings targets. We test these associations on a large sample of US firms. Our evidence suggests that quarterly guidance is informative and lowers myopic incentives. However, our analyses also reveal endogenous associations exist between guidance and real earnings management. In contrast with existing concerns over frequent guiders, we find that guidance appears problematic in infrequent guiders, and in firms that issue good news earnings guidance and that operate in settings where earnings pressures are high.
Nudging App Adoption: Choice Architecture Facilitates Consumer Uptake of Mobile Apps

How can firms encourage consumers to adopt smartphone apps? The authors show that several inexpensive choice architecture techniques can make users more likely to enable important app features and complete app onboarding. In six preregistered experiments (n = 5,968) and a field experiment (n = 594,997), choice architecture interventions manipulating choice sequence, color, and wording of app adoption decisions dramatically increased app adoption. Across experiments, integrating multiple feature decisions into a single choice increased adoption. This integration effect emerges because it decreases decision noise and reduces the prominence of individual features, consistent with support theory. Changing colors to match habitual patterns commonly found in current digital interfaces appears to increase adoption by accelerating consumers’ decisions. Finally, wording options as if enabling the app is the default response (even without changing the actual default) also increases adoption. These “defaultless defaults” may be particularly relevant in heavily regulated consumer domains, such as finance or health care. The effects generalized across different types of apps and were robust across subsamples varying in demographics, attitudes toward the apps, and political affiliation. These results suggest simple tools that marketing managers and app developers can use to increase app adoption.
Interpretation of the cosmic ray positron and electron excesses with an annihilating-decaying dark matter scenario

The precise measurements of energy spectra of cosmic ray positrons and/or electrons by recent experiments show clear excesses above 10 GeV. Moreover, a potential sharp spectral feature was suggested by the Dark Matter Particle Explorer (DAMPE) data. These results inspire quite a number of discussions on the connection with either the annihilation/decay of dark matter (DM) or the astrophysical origins. Here we discuss a DM scenario in which DM particles could annihilate and decay into standard model particle pairs simultaneously. In this model, the peak structure is due to the DM annihilation in a nearby subhalo and the broad positron/electron excesses are due to the decay of DM in the Milky Way. This model can reasonably explain the DAMPE and AMS-02 data of the total e^+e^− spectra and the positron fraction, with model parameters being consistent with existing constraints. A simple realization of such a DM model is the spin-1 vector DM model.
Photon-number entangled states generated in Kerr media with optical parametric pumping

Two nonlinear Kerr oscillators mutually coupled by parametric pumping are studied as a source of states entangled in photon numbers. Temporal evolution of entanglement quantified by negativity shows the effects of sudden death and birth of entanglement. Entanglement is preserved even in asymptotic states under certain conditions. The role of reservoirs at finite temperature in entanglement evolution is elucidated. Relation between generation of entangled states and violation of Cauchy-Schwartz inequality for oscillator intensities is found.
Quit Smoking Clinic: Factors Associated with Successful Quit Smoking in Besut District, Terengganu State of Malaysia

Background: Malaysian National Health and Morbidity Survey 2019 illustrated the prevalence of current smoker was 21.3%. Out of current smokers, only about half of them made an attempt to quit smoking in the past 12 months and only 7.4% of the smokers had visited a healthcare provider for quit smoking advice. The “Quit Smoking Clinic” was established in Malaysia since 2000 to make smoking cessation service accessible for everyone. This study aims to determine the factors associated with successful quit smoking among smokers attending “Quit Smoking Clinic” in Besut District, Malaysia. Methods: A district-wide record review study using “Quit Smoking Clinic” record [BPKK/KBM(PKD)/3/2012 Amendment 2018] from seven health clinics was conducted. A logistic regression (LR) model was performed to assess the factors influencing successful quit smoking status. A success quit smoking status was defined as remaining abstinent from smoking behavior at six months of clinic follow-up. Result: A sample of 414 clients from seven health clinics in Besut were included, 14.3% of them had a success quit smoking status. In the final MLR model, factors influencing successful quit smoking were older age group 45 years old and above (Adj. OR 2.27; 95% CI: 1.22, 4.22, p-value=0.010), voluntary participation in the clinic (Adj. OR 1.86; 95% CI: 1.00, 3.45, p-value=0.049) and frequent visits to the clinic (Adj. OR 5.33; 95% CI: 2.88, 9.86, p-value<0.001). Conclusion: Recognition of these factors associated with the success of quit smoking status is beneficial to improve the service of “Quit Smoking Clinic” as well as to promote an accessible smoking cessation support for smokers in the district. Reinforcement of tobacco control policies in Malaysia is imperative to encourage more smokers to quit smoking in the country.
Near Optimal Control of a Ride-Hailing Platform via Mirror Backpressure

Ride-hailing platforms need to match supply and demand so as to maximize the rate of payoff generation while respecting the geographical flow constraints, namely, that the rate at which vehicles arrive at a location must equal the rate at which they leave that location. The platform's control levers include: (i) entry control, i.e. it can choose not to serve some customers, (ii) dynamic pricing, i.e. it can set prices for each ride depending on its origin and destination, and (iii) assignment rule, i.e. it can choose from which neighboring location to dispatch a car for pickup. We consider two settings depending on whether pricing is an available lever to the platform. In joint-entry-assignment (JEA) setting, the platform can only use levers (i) and (iii) (for example, Didi in China does not use dynamic pricing). In joint-pricing-assignment (JPA) setting, the platform can use levers (ii) and (iii) (e.g. most ride-hailing platforms in North America). We introduce a novel family of Mirror Backpressure (MBP) platform control policies which are simple, practical, and do not require prior knowledge of the demand arrival rates. Key challenges include that serving a customer reduces supply availability at the dispatch location but increases it at the dropoff location ("supply externalities"), and that the number of vehicles at any location can never be negative (no-underflow constraints"). Mirror Backpressure generalizes the backpressure policy such that it executes mirror descent, allowing us to address these challenges. MBP loses at most an $O(K/T + 1/K)$ fraction of the achievable payoff in the JEA setting and $O(\sqrt{K/T + 1/K})$ fraction in the JPA setting, where $K$ is the number of vehicles and $T$ is the horizon. Simulation results in a realistic environment support our theoretical findings.
Kenaf-Coir based hybrid nano-composite: an analytical and representative volume element analysis

The increasing demand for good and improved polymeric composites has led to a surge in the number of researches on hybrid composites, strengthened and enforced with the natural fibres. This paper mainly analyses and presents the attributes of hybrid composites made from natural fibres and carbon nano-tube (CNT) nanoparticles. A novel hybrid composite considered in this research includes kenaf and coir fibres with CNT nanoparticles embedded in an epoxy matrix. The proposed hybrid nanocomposite’s elastic features are calculated by using different analytical models like Chamis, Mori-Tanaka, Nielson elastic models etc and also with the help of Representative Volume Element Analysis (RVE). The content of fibre volume is varied in four different samples and it is found that upon varying the content of fibre volume, the mechanical properties like longitudinal modulus and transverse modulus got affected. The results evaluated from different analytical models are observed to be in good agreement with each other and also with the results of RVE analysis.
LOCATING THE “MISSING” BARYONS WITH EXTRAGALACTIC DISPERSION MEASURE ESTIMATES

Recently, Thornton and coworkers confirmed a class of millisecond radio bursts likely of extragalactic origin that is well-suited for estimating dispersion measures (DMs). We calculate the probability distribution of DM(z) in different models for how the cosmic baryons are distributed (both analytically and with cosmological simulations). We show that the distribution of DM is quite sensitive to whether the “missing” baryons lie around the virial radius of 1011–1013 M☉ halos or further out, which is not easily constrained with other observational techniques. The intrinsic contribution to DM from each source could complicate studies of the extragalactic contribution. This difficulty is avoided by stacking based on the impact parameter to foreground galaxies. We show that a stacking analysis using a sample of ∼100 DM measurements from arcminute-localized, z ≳ 0.5 sources would place interesting constraints at 0.2–2 halo virial radii on the baryonic mass profile surrounding different galaxy types. Conveniently for intergalactic studies, sightlines that intersect intervening galactic disks should be easily identified owing to scattering. A detectable level of scattering may also result from turbulence in the circumgalactic medium.
RADIO PULSAR BINARIES IN GLOBULAR CLUSTERS: THEIR ORBITAL ECCENTRICITIES AND STELLAR INTERACTIONS

High sensitivity searches of globular clusters (GCs) for radio pulsars by improved pulsar search algorithms and sustained pulsar timing observations have so far yielded some 140 pulsars in more than two dozen GCs. The observed distribution of orbital eccentricity and period of binary radio pulsars in GCs have imprints of the past interaction between single pulsars and binary systems or of binary pulsars and single passing noncompact stars. It is seen that GCs have different groups of pulsars. These may have arisen out of exchange or merger of a component of the binary with the incoming star or a “fly-by” in which the original binary remains intact but undergoes a change of eccentricity and orbital period. We consider the genesis of the distribution of pulsars using analytical and computational tools such as STARLAB, which performs numerical scattering experiments with direct N-body integration. Cluster pulsars with intermediate eccentricities can mostly be accounted for by fly-bys, whereas those with high eccentricities are likely to be the result of exchanges and/or mergers of single stars with the binary companion of the pulsar, although there are a few objects which do not easily fit into this description. The corresponding distribution for galactic field pulsars shows notable differences from the GC pulsar orbital period and eccentricity distribution. The long orbital period pulsars in the galactic field with frozen out low eccentricities are largely missing from the GCs, and we show that the ionization of these systems in GCs cannot alone account for the peculiarities.
Calculation of the electron two-slit experiment using a quantum mechanical variational principle

A nonlocal relativistic variational principle (VP) has recently been proposed as an alternative to the Dirac wave equation of standard quantum mechanics. We apply that principle to the electron two-slit experiment. The detection system is modeled as a screen made of atoms, any one of which can be excited by the incident electron, but we avoid restricting the detection mechanism further. The VP is shown to predict that, at the time the electron reaches the screen, its wavefunction will be localized to the neighborhood of a single atom, resulting in a position-type measurement. In an ensemble of such experiments (‘identically prepared’ except that the initial phase of the wavefunction—the hidden variable in the VP formulation—is sampled over the expected uniform distribution), the distribution of measured positions will reproduce the interference pattern predicted by the Dirac equation. We also demonstrate that with a detection system designed fundamentally to detect the electron's transverse wavelength rather than its position, the VP predicts that one such mode will be detected, that is, a wavelength measurement will result. Finally, it is shown that these results are unchanged in the ‘delayed choice’ variant of the experiment.
Nonperturbative QCD Simulations with 2+1 Flavors of Improved Staggered Quarks

Dramatic progress has been made over the last decade in the numerical study of quantum chromodynamics (QCD) through the use of improved formulations of QCD on the lattice (improved actions), the development of new algorithms, and the rapid increase in computing power available to lattice gauge theorists. In this article simulations of full QCD are described using the improved staggered quark formalism, ''asqtad'' fermions. These simulations were carried out with two degenerate flavors of light quarks (up and down) and with one heavier flavor, the strange quark. Several light quark masses, down to about three times the physical light quark mass, and six lattice spacings have been used. These enable controlled continuum and chiral extrapolations of many low energy QCD observables. The improved staggered formalism is reviewed, emphasizing both advantages and drawbacks. In particular, the procedure for removing unwanted staggered species in the continuum limit is reviewed. Then the asqtad lattice ensembles created by the MILC Collaboration are described. All MILC lattice ensembles are publicly available, and they have been used extensively by a number of lattice gauge theory groups. The physics results obtained with them are reviewed, and the impact of these results on phenomenology is discussed. Topics includemore » the heavy quark potential, spectrum of light hadrons, quark masses, decay constants of light and heavy-light pseudoscalar mesons, semileptonic form factors, nucleon structure, scattering lengths, and more. « less
THE IMPORTANCE OF JET BENDING IN GAMMA-RAY AGNs—REVISITED

We investigate the hypothesis that γ-ray-quiet active galactic nuclei (AGNs) have a greater tendency for jet bending than γ-ray-loud AGNs, revisiting the analysis of Tingay et al. We perform a statistical analysis using a large sample of 351 radio-loud AGNs along with γ-ray identifications from the Fermi Large Area Telescope (LAT). Our results show no statistically significant differences in jet-bending properties between γ-ray-loud and γ-ray-quiet populations, indicating that jet bending is not a significant factor for γ-ray detection in AGNs.
Almost sure central limit theorem for branching random walks in random environment

We consider the branching random walks in $d$-dimensional integer lattice with time--space i.i. d. offspring distributions. Then the normalization of the total population is a nonnegative martingale and it almost surely converges to a certain random variable. When $d\geq3$ and the fluctuation of environment satisfies a certain uniform square integrability then it is nondegenerate and we prove a central limit theorem for the density of the population in terms of almost sure convergence.
IMAGING DISCOVERY OF THE DEBRIS DISK AROUND HIP 79977

We present Subaru/HiCIAO H-band high-contrast images of the debris disk around HIP 79977, whose presence was recently inferred from an infrared excess. Our images resolve the disk for the first time, allowing characterization of its shape, size, and dust grain properties. We use angular differential imaging (ADI) to reveal the disk geometry in unpolarized light out to a radius of ∼2″, as well as polarized differential imaging to measure the degree of scattering polarization out to ∼1. ″5. In order to strike a favorable balance between suppression of the stellar halo and conservation of disk flux, we explore the application of principal component analysis to both ADI and reference star subtraction. This allows accurate forward modeling of the effects of data reduction on simulated disk images, and thus direct comparison with the imaged disk. The resulting best-fit values and well-fitting intervals for the model parameters are a surface brightness power-law slope of Sout = −3.2[ − 3.6, −2.9], an inclination of i = 84°[81°, 86°], a high Henyey–Greenstein forward-scattering parameter of g = 0.45[0.35, 0.60], and a non-significant disk–star offset of u = 3.0[ − 1.5, 7.5] AU = 24[ − 13, 61] mas along the line of nodes. Furthermore, the tangential linear polarization along the disk rises from ∼10% at 0. ″5 to ∼45% at 1. ″5. These measurements paint a consistent picture of a disk of dust grains produced by collisional cascades and blown out to larger radii by stellar radiation pressure.