Moduli spaces of irregular singular connections

In the geometric version of the Langlands correspondence, irregular singular point connections play the role of Galois representations with wild ramification. In this paper, we develop a geometric theory of fundamental strata to study irregular singular connections on the projective line. Fundamental strata were originally used to classify cuspidal representations of the general linear group over a local field. In the geometric setting, fundamental strata play the role of the leading term of a connection. We introduce the concept of a regular stratum, which allows us to generalize the condition that a connection has regular semisimple leading term to connections with non-integer slope. Finally, we construct a symplectic moduli space of meromorphic connections on the projective line that contain a regular stratum at each singular point.Comment: 53 pages. A new section (Section 4.4) has been added making precise the relationship between formal types and isomorphism classes of formal connections. Significant revisions and additions have also been made to Sections 3.1 and 4.3 and the introduction to Section

Advertising preferences when presented with various ad stimuli: the impact of stereotypical versus non-stereotypical advertising

Past research has shown that the preferences for different types of advertising shift as social attitudes change. Whereas in the past people preferred advertising portraying men and women in gender-stereotypical roles, today\u27s more liberal social attitudes seem to reflect a trend for people to prefer ads depicting those men and women in non-stereotypical gender roles. In the current study, 30 university students were tested for their preferences among stereotypical, nonstereotypical and neutral ads. Stimuli were 30 magazine advertisements, 10 each of the three types of ads, rated on a five point like-dislike scale, with higher scores reflecting greater ad appeal. Evidence was found such that subjects significantly preferred advertisements that were nonstereotypical over neutral and stereotypical ads F (2, 28) = 31.402, p \u3c.001

ENERGY VALUE OF DE-OILED DISTILLERS GRAINS PLUS SOLUBLES IN BEEF CATTLE DIETS

Ethanol plants are centrifuging off oil from the thin stillage stream as it has added market value currently. The impact of oil removal on cattle performance has been minimally researched. Thus four trials, one growing, one digestion, and two feedlot, were designed to determine the energy and feeding value of de-oiled distillers grains in beef cattle diets. In growing cattle diets, diet concentration of modified distillers grains plus solubles (MDGS) impacted cattle performance more than oil content. Ending BW, ADG, and G:F did not differ between cattle fed de-oiled or full fat MDGS, however cattle fed de-oiled MDGS had lower DMI than those fed full fat MDGS. No significant differences in fiber digestibility were observed between de-oiled and full fat MDGS treatments. The energy value of de-oiled MDGS in growing cattle diets was calculated to be 124% the value of corn. In finishing steer diets, increasing diet concentrations of de-oiled MDGS increased G:F. However, decreasing MDGS fat content from 12.0% to 7.2% decreased steer performance by 3.4%. No significant interactions were observed when increasing concentrations of de-oiled wet distillers grains plus solubles (WDGS) were fed with steam flaked (SFC) or dry rolled corn (DRC). Comparison of steer performance when de-oiled and full fat WDGS are fed in SFC and DRC diets resulted in no significant differences also. In growing and finishing diets small differences in cattle performance have been observed. Energy values for distillers grain in growing diets are still high with no improvements in fiber digestibility being observed. In finishing diets where distillers grains were fed at 30-35%, de-oiled distillers grains have 89% the feeding value of full fat distillers grain. Key Words: corn processing, digestion, de-oiled, finishing, growing Advisors: Galen E. Erickson and Matthew K. Luebb

The Physical Properties of LBGs at z>5: Outflows and the "pre-enrichment problem"

We discuss the properties of Lyman Break galaxies (LBGs) at z>5 as determined from disparate fields covering approximately 500 sq. arcmin. While the broad characteristics of the LBG population has been discussed extensively in the literature, such as luminosity functions and clustering amplitude, we focus on the detailed physical properties of the sources in this large survey (>100 with spectroscopic redshifts). Specifically, we discuss ensemble mass estimates, stellar mass surface densities, core phase space densities, star-formation intensities, characteristics of their stellar populations, etc as obtained from multi-wavelength data (rest-frame UV through optical) for a subsample of these galaxies. In particular, we focus on evidence that these galaxies drive vigorous outflows and speculate that this population may solve the so-called ``pre-enrichment problem''. The general picture that emerges from these studies is that these galaxies, observed about 1 Gyr after the Big Bang, have properties consistent with being the progenitors of the densest stellar systems in the local Universe -- the centers of old bulges and early type galaxies.Comment: 4 pages, to appear in "Pathways Through an Eclectic Universe", J. H. Knappen, T. J. Mahoney, and A. Vazedekis (Eds.), ASP Conf. Ser., 200

The detection of FIR emission from high redshift star-forming galaxies in the ECDF-S

ABRIDGED: We have used the LABOCA Survey of the ECDF-S (LESS) to investigate rest-frame FIR emission from typical SF systems (LBGs) at redshift 3, 4, and 5. We initially concentrate on LBGs at z~3 and select three subsamples on stellar mass, extinction corrected SF and rest-frame UV-magnitude. We produce composite 870micron images of the typical source in our subsamples, obtaining ~4sigma detections and suggesting a correlation between FIR luminosity and stellar mass. We apply a similar procedure to our full samples at z~3, 4, 4.5 and 5 and do not obtain detections - consistent with a simple scaling between FIR luminosity and stellar mass. In order to constrain the FIR SED of these systems we explore their emission at multiple wavelengths spanning the peak of dust emission at z~3 using the Herschel SPIRE observations of the field. We obtain detections at multiple wavelengths for both our stellar mass and UV-magnitude selected samples, and find a best-fit SED with T_dust in the ~33-41K range. We calculate L_FIR, obscured SFRs and M_dust, and find that a significant fraction of SF in these systems is obscured. Interestingly, our extinction corrected SFR sample does not display the large FIR fluxes predicted from its red UV-spectral slope. This suggests that the method of assuming an intrinsic UV-slope and correcting for dust attenuation may be invalid for this sample - and that these are not in fact the most actively SF systems. All of our z~3 samples fall on the `main sequence' of SF galaxies at z~3 and our detected subsamples are likely to represent the high obscuration end of LBGs at their epoch. We compare the FIR properties of our subsamples with various other populations, finding that our stellar mass selected sample shows similar FIR characteristics to SMGs at the same epoch and therefore potentially represents the low L_FIR end of the high redshift FIR luminosity function.Comment: 18 pages, 10 figure, MNRAS accepted, corrected typos, acknowledgements adde

Is the Euro up for Grabs? Evidence from a Survey Experiment

The COVID-19 pandemic may lead to a resurgence of the euro crisis. In this context, Italy seems particularly vulnerable: support for the euro is lower than in most other eurozone countries, and a possible exit could have serious consequences for the common currency. Based on a novel survey experiment, this paper shows that the pro-euro coalition is fragile in Italy and preferences are malleable. They are heavily dependent on the perceived costs of continued membership, as a majority of Italians would opt for Italexit rather than accepting a bailout plan requiring the implementation of austerity policies. Individuals who feel they have not benefited from the euro are most likely to support exit when faced with the prospect of austerity. This suggests that, differently from Greece, where voters were determined to remain in the euro at all costs, the pro-euro coalition may crumble if Italy is exposed to harsh conditionality.Die COVID-19-Pandemie hat das Potenzial, zu einem Wiederaufleben der Eurokrise beizutragen. Italien erscheint unter diesen Umständen besonders verwundbar: Die Unterstützung für den Euro ist geringer als in den meisten anderen Ländern der Eurozone und ein möglicher Ausstieg Italiens aus dem Euro könnte schwerwiegende Folgen für die gesamte Währungsunion haben. Anhand eines neuen Umfrageexperiments zeigt dieses Papier, dass das den Euro unterstützende gesellschaftliche Bündnis in Italien brüchig ist und die Präferenzen in der italienischen Wählerschaft in hohem Maße veränderlich sind. Individuelle Präferenzen zum Euro hängen stark von den wahrgenommenen Kosten einer fortwährenden Mitgliedschaft im Euro ab. Eine Mehrheit der Italienerinnen und Italiener würde eher für einen Italexit stimmen, als ein Rettungspaket zu akzeptieren, welches die Umsetzung von Austeritätspolitik erfordern würde. Sind die Befragten mit der Aussicht auf Austeritätspolitik konfrontiert, stimmen insbesondere diejenigen für einen Ausstieg Italiens aus dem Euro, die glauben, dass der Euro ihnen nicht genutzt habe. Im Gegensatz zu Griechenland, wo Wählerinnen und Wähler entschlossen waren, zu jedem Preis im Euro zu verbleiben, zeigt dieser Befund, dass das Pro-Euro-Bündnis in Italien auseinanderfallen könnte, sollte Italien mit einer harten Austeritätspolitik konfrontiert sein.Contents 1 Introduction 2 Individual-level preferences for eurozone membership and exit 3 Framing effects on support for the euro 4 Data and methods Experiment design and dependent variable Independent variables Empirical strategy 5 Results The social support base of eurozone membership and exit Multivariate analysis of support for the euro Results from the survey experiment Heterogeneous framing effects 6 Conclusion Reference