Alas, the dark matter structures were not that trivial

The radial density profile of dark matter structures has been observed to have an almost universal behaviour in numerical simulations, however, the physical reason for this behaviour remains unclear. It has previously been shown that if the pseudo phase-space density, rho/sigma_d^epsilon, is a beautifully simple power-law in radius, with the "golden values" epsilon=3 and d=r (i.e., the phase-space density is only dependent on the radial component of the velocity dispersion), then one can analytically derive the radial variation of the mass profile, dispersion profile etc. That would imply, if correct, that we just have to explain why rho/sigma^3_r ~r^{-alpha}, and then we would understand everything about equilibrated DM structures. Here we use a set of simulated galaxies and clusters of galaxies to demonstrate that there are no such golden values, but that each structure instead has its own set of values. Considering the same structure at different redshifts shows no evolution of the phase-space parameters towards fixed points. There is also no clear connection between the halo virialized mass and these parameters. This implies that we still do not understand the origin of the profiles of dark matter structures.Comment: 4 pages, 3 figures, accepted for publication in ApJ

A little autonomy support goes a long way. Daily autonomy-supportive parenting, child well-being, parental need fulfillment, and change in child, family, and parent adjustment across the adaptation to the COVID-19 pandemic

This study examined the effects of daily parental autonomy support on changes in child behavior, family environment, and parental well-being across 3 weeks during the COVID-19 pandemic in Germany. Day-to-day associations among autonomy-supportive parenting, parental need fulfillment, and child well-being were also assessed. Parents of school children (6–19 years) reported on adjustment measures at two measurement occasions and completed up to 21 daily online questionnaires in the weeks between these assessments. Results from dynamic structural equation models suggested reciprocal positive relations among autonomy-supportive parenting and parental need fulfillment. Daily parental autonomy support, parental need fulfillment, and child well-being partially predicted change in adjustment measures highlighting the central role of daily parenting for children’s adjustment during the pandemic. (DIPF/Orig.

Distance learning, parent-child interactions, and affective well-being of parents and children during the COVID-19 pandemic. A diary study

To slow down the spread of the COVID-19 virus, schools around the world were closed in early 2020, transferring children\u27s scholastic activities to the homes and imposing a massive burden on parents and school-age children. Using data of a 21-day diary study conducted between March and April 2020 in Germany, this work examined whether (a) distance learning and (b) parents\u27 involvement therein were associated with negative parent-child interactions and affective well-being of parents and children, over and above the effect of daily stressors. Participants were 562 parents (489 mothers, Mage = 42.79, SDage = 6.12, range = 25-63) most of whom were married (n = 382, 68.0%). They responded to the daily items with respect to the youngest child living in their household (Mage = 9.74, SDage = 2.81, range = 6-19). On days when children were working on school tasks, parents reported more negative parent-child interactions as well as lower parental and child positive affect and higher child negative affect, but not higher parental negative affect. Moreover, days when parents were more heavily involved in learning (i.e., when children worked less independently) were days with more negative parent-child interactions, lower parental and child positive affect, and higher parental and child negative affect. Negative parent-child interactions were linked to lower affective well-being of parents and children, and partially accounted for the relation among daily stressors and affective well-being. The present work highlights the need for measures to better support school-age children and their parents during distance learning. (DIPF/Orig.

Homeschooling während der SARS-CoV-2-Pandemie. Die Rolle dispositioneller Selbstregulation und Eigenschaften täglicher Lernaufgaben für die tägliche Selbstregulation von Schüler*innen

As a means to counter the SARS-CoV-2 pandemic, schools were closed throughout Germany between mid-March and end of April 2020. Schooling was translocated to the students\u27 homes where students were supposed to work on learning tasks provided by their teachers. Students\u27 self-regulation and attributes of the learning tasks may be assumed to have played important roles when adapting to this novel schooling situation. They may be predicted to have influenced students\u27 daily self-regulation and hence the independence with which they worked on learning tasks. The present work investigated the role of students\u27 trait self-regulation as well as task difficulty and task enjoyment for students\u27 daily independence from their parents in learning during the homeschooling period. Data on children\u27s trait self-regulation were obtained through a baseline questionnaire filled in by the parents of 535 children (Mage = 9.69, SDage = 2.80). Parents additionally reported about the daily task difficulty, task enjoyment, and students\u27 learning independence through 21 consecutive daily online questionnaires. The results showed students\u27 trait self-regulation to be positively associated with their daily learning independence. Additionally, students\u27 daily learning independence was shown to be negatively associated with task difficulty and positively with task enjoyment. The findings are discussed with regard to students\u27 daily self-regulation during the homeschooling period. Finally, implications for teaching practice during the pandemic-related school closures are derived. (DIPF/Orig.)Um die SARS-CoV-2-Pandemie einzudämmen, wurden zwischen Mitte März und Ende April 2020 deutschlandweit alle Schulen geschlossen. Während dieser Zeit wurden die Schüler*innen zu Hause beschult (\u27Homeschooling\u27) und arbeiteten an Lernaufgaben, die von ihren Lehrkräften bereitgestellt wurden. Bei der Anpassung an diese neuartige Beschulungssituation könnten sowohl die Selbstregulation der Schüler*innen als auch die Eigenschaften der Lernaufgaben eine wichtige Rolle gespielt haben. Es ist anzunehmen, dass diese insbesondere die tagtägliche Selbstregulation der Schüler*innen beim Bearbeiten der Lernaufgaben und damit die Selbstständigkeit, mit der sie an den Lernaufgaben arbeiteten beeinflusst haben. Die vorliegende Arbeit untersuchte, welche Rolle die dispositionelle Selbstregulation von Schüler*innen, die Schwierigkeit der Lernaufgaben und die Freude an den Aufgaben für die tagtägliche Selbstständigkeit der Bearbeitung der Aufgaben während des Homeschoolings spielten. Die dispositionelle Selbstregulation der Schüler*innen wurde zunächst über einen Eingangsfragebogen erfasst, der von den Eltern von 535 Kindern ausgefüllt wurde (MAlter = 9,69; SDAlter = 2,80). Die Eltern berichteten anschließend an 21 aufeinander folgenden Tagen über die tägliche Aufgabenschwierigkeit, die Freude an den Aufgaben und die Selbstständigkeit, mit der ihre Kinder die Lernaufgaben bearbeiteten. Die Ergebnisse zeigten, dass die dispositionelle Selbstregulation der Schüler*innen positiv mit ihrer täglichen Selbstständigkeit beim Lernen assoziiert war. Darüber hinaus war die tägliche Selbstständigkeit der Schüler*innen beim Lernen negativ mit der Aufgabenschwierigkeit und positiv mit der Freude an den Aufgaben verbunden. Die Ergebnisse werden im Hinblick auf die tägliche Selbstregulation der Schüler*innen während der Beschulung zu Hause diskutiert. Abschließend werden Implikationen für die Lehrpraxis während der pandemiebedingten Schulschließungen abgeleitet. (DIPF/Orig.

Evaluating sociometer theory in children\u27s everyday lives. Inclusion, but not exclusion by peers at school is related to within-day change in self-esteem

Sociometer theory proposes that a person\u27s self-esteem is a permanent monitor of perceived social inclusion and exclusion in a given situation. Despite this within-person perspective, respective research in children\u27s everyday lives is lacking. In three intensive longitudinal studies, we examined whether children\u27s self-esteem was associated with social inclusion and exclusion by peers at school. Based on sociometer theory, we expected social inclusion to positively predict self-esteem and social exclusion to negatively predict self-esteem on within- and between-person levels. Children aged 9-12 years reported state self-esteem twice per day (morning and evening) and social inclusion and exclusion once per day for two (Study 1) and four weeks (Studies 2-3). Consistently across studies, we found that social inclusion positively predicted evening self-esteem on within- and between-person levels. By contrast, social exclusion was not associated with evening self-esteem on the within-person level. On the between-person level, social exclusion was negatively linked to evening self-esteem only in Study 1. Multilevel latent change score models revealed that children\u27s self-esteem changed from mornings (before school) to evenings (after school) depending on their perceived daily social inclusion, but not exclusion. The findings are discussed in light of sociometer theory and the bad-is-stronger-than-good phenomenon. (DIPF/Orig.

The van Hove distribution function for Brownian hard spheres: dynamical test particle theory and computer simulations for bulk dynamics

We describe a test particle approach based on dynamical density functional theory (DDFT) for studying the correlated time evolution of the particles that constitute a fluid. Our theory provides a means of calculating the van Hove distribution function by treating its self and distinct parts as the two components of a binary fluid mixture, with the `self' component having only one particle, the `distinct' component consisting of all the other particles, and using DDFT to calculate the time evolution of the density profiles for the two components. We apply this approach to a bulk fluid of Brownian hard spheres and compare to results for the van Hove function and the intermediate scattering function from Brownian dynamics computer simulations. We find good agreement at low and intermediate densities using the very simple Ramakrishnan-Yussouff [Phys. Rev. B 19, 2775 (1979)] approximation for the excess free energy functional. Since the DDFT is based on the equilibrium Helmholtz free energy functional, we can probe a free energy landscape that underlies the dynamics. Within the mean-field approximation we find that as the particle density increases, this landscape develops a minimum, while an exact treatment of a model confined situation shows that for an ergodic fluid this landscape should be monotonic. We discuss possible implications for slow, glassy and arrested dynamics at high densities.Comment: Submitted to Journal of Chemical Physic

Reciprocal relations of subjective sleep quality and affective well-being in late childhood

High sleep quality has been associated with beneficial outcomes across the life span. Intensive longitudinal studies suggest that these beneficial effects can also be observed on a day-to-day level. However, the dynamic interplay between subjective sleep quality and affective well-being in children\u27s daily life has only rarely been investigated. The aims of the present work were (a) to replicate findings from a prior ambulatory assessment study in this area (Könen et al., 2016), (b) to explore the effect of subjective sleep quality on well-being throughout the day, and (c) to examine the reciprocal relation between subjective sleep quality and well-being in more detail. Data from two ambulatory assessment studies with children between 8 and 11 years (N = 108/84, with assessments over 28/21 consecutive days) consistently showed that positive affect was higher and negative affect was lower after nights with better sleep quality, and that the effects of subjective sleep quality were stronger on well-being assessed in the morning compared with later in the day. Results from dynamic structural equation models revealed reciprocal effects of subjective sleep quality and positive affect. Negative affect was not consistently related to worse subsequent sleep quality after controlling for positive affect and prior night\u27s sleep quality. Results suggest a close relation of sleep quality and positive affect, which strengthens the idea behind interventions targeting both, children\u27s sleep and well-being. Differences between children in the dynamic interplay between sleep and affect may be important predictors of long-term outcomes. (DIPF/Orig.

Quantitative Chevalley-Weil theorem for curves

The classical Chevalley-Weil theorem asserts that for an \'etale covering of projective varieties over a number field K, the discriminant of the field of definition of the fiber over a K-rational point is uniformly bounded. We obtain a fully explicit version of this theorem in dimension 1.Comment: version 4: minor inaccuracies in Lemma 3.4 and Proposition 5.2 correcte

Analyse geplanter Institutionalisierungsprozesse in Paarbeziehungen unter dem Einfluss prekärer Beschäftigungsverhältnisse: zentrale Ergebnisse der ersten Projektphase

Das primäre Ziel des Forschungsprojektes AGIPEB besteht in der Analyse realisierter und geplanter Institutionalisierungsschritten von Paaren unter dem Einfluss befristeter Beschäftigungsverhältnisse in Deutschland. Dabei wird der Fokus auf zentrale Entscheidungen in der Lebensführung von Paaren gerichtet, die den Verfestigungsgrad der Partnerschaft erhöhen und eine materielle oder immaterielle Investitionsbereitschaft erfordern. Dazu gehören sowohl Entscheidungen wie der Erwerb einer Immobilie zwecks gemeinsamer Vermögensbildung als auch Heirats- und Fertilitätsentscheidungen, deren langfristige Planbarkeit unter einem erhöhten Arbeitsmarktrisiko gefährdet ist. Ausgehend von einem rationalen Investitionsmodell konnte in der ersten Phase des Forschungsprojektes gezeigt werden, dass die Form des Beschäftigungsverhältnisses das Entscheidungsverhalten in Hochkostensituationen beeinflusst. So ergab sich im Laufe der Analyse der 1.083 per Zufallsauswahl erhobenen Personen im Alter zwischen 20 und 36 Jahren, dass die Geburt des ersten gemeinsamen Kindes von Paaren mit mindestens einem von befristeter Erwerbsarbeit betroffenen Partner in der Partnerschaftsbiographie aufgeschoben wird, während der erste gemeinsame Urlaub im Vergleich zu Beziehungen mit Partnern im Normalarbeitsverhältnis vorgezogen wird

Standardization and implementation of fluorescence molecular endoscopy in the clinic

Significance: Near-infrared fluorescence molecular endoscopy (NIR-FME) is an innovative technique allowing for in vivo visualization of molecular processes in hollow organs. Despite its potential for clinical translation, NIR-FME still faces challenges, for example, the lack of consensus in performing quality control and standardization of procedures and systems. This may hamper the clinical approval of the technology by authorities and its acceptance by endoscopists. Until now, several clinical trials using NIR-FME have been performed. However, most of these trials had different study designs, making comparison difficult. Aim: We describe the need for standardization in NIR-FME, provide a pathway for setting up a standardized clinical study, and describe future perspectives for NIR-FME. Body: Standardization is challenging due to many parameters. Invariable parameters refer to the hardware specifications. Variable parameters refer to movement or tissue optical properties. Phantoms can be of aid when defining the influence of these variables or when standardizing a procedure. Conclusion: There is a need for standardization in NIR-FME and hurdles still need to be overcome before a widespread clinical implementation of NIR-FME can be realized. When these hurdles are overcome, clinical outcomes can be compared and systems can be benchmarked, enabling clinical implementation