On the twisted chiral potential in 2d and the analogue of rigid special geometry for 4-folds

We discuss how to obtain an N=(2,2) supersymmetric SU(3) gauge theory in two dimensions via geometric engineering from a Calabi-Yau 4-fold and compute its non-perturbative twisted chiral potential. The relevant compact part of the 4-fold geometry consists of two intersecting P^1's fibered over P^2. The rigid limit of the local mirror of this geometry is a complex surface that generalizes the Seiberg-Witten curve and on which there exist two holomorphic 2-forms. These stem from the same meromorphic 2-form as derivatives w.r.t. the two moduli, respectively. The middle periods of this meromorphic form give directly the twisted chiral potential. The explicit computation of these and of the four-point Yukawa couplings allows for a non-trivial test of the analogue of rigid special geometry for a 4-fold with several moduli.Comment: 20 pages, LaTeX, no figures; v2: discussion of FI-couplings in section 3 and appendix enlarged, version to appear in JHE

Perceptions of Peace and Reconciliation: Case of Lokokwo Peyot Women’s Group in Paidwe Parish, Bobi Sub-County

This research project explores perceptions of peace and reconciliation among female members of the Lokokwo Peyot Women’s Group in Paidwe Parish, Bobi Sub-County, Gulu District. It aims to understand how women define the concepts of peace and reconciliation and how women currently perceive peace and reconciliation within their community. It also attempts to further understand these perceptions through examining the women’s past experiences and current challenges. The project displays the impact of women’s involvement in peacebuilding and conflict mediation in a region that is desperately trying to recover from decades of destruction and violence. Research was carried out at two separate but related locations in Gulu District: the home of the Lokokwo Peyot group’s Chairperson in Paidwe Parish within Bobi Sub-County, and the main office of Gulu Women’s Economic Development and Globalization (GWED-G) in Gulu Municipality. Eleven individual interviews and two group discussions form the foundation of this project. The focus on the Lokokwo Peyot Women’s Group was made possible through the assistance and cooperation of GWED-G staff members, and the interested group members who so generously donated their time and experiences. This study discovered that women in the Lokokwo Peyot group have witnessed significant changes personally and locally since the group’s founding in 2009, and they feel that an environment of relative peace has developed in the community. Although traditionally women do not speak publicly or actively participate in community meetings, the women’s involvement in the group challenges such cultural norms and allows them to feel empowered and respected. By promoting a peaceful environment from within their individual homes and villages, group members have succeeded in decreasing the level of conflict and violence present

Investigating Sexual Violence as a Weapon of War in the Democratic Republic of Congo (DRC) Through Critical Discourse Analysis

This paper addresses the large-scale sexual violence that has taken place (and still continues) within the Democratic Republic of Congo (DRC) using critical discourse analysis. Disturbing statistics have resulted in the identification of the DRC as the rape capital of the world, and a variety of national, regional, and international actors have employed sexual violence as a weapon of war. Victims frequently receive little assistance, perpetrators act without fear of serious repercussions, and the government of the DRC fails to successfully implement relative legislation. Through an investigation of the discourse surrounding victims, perpetrators, and political institutions respectively, I will develop an understanding of how specific language portrays each of these participants in multiple reports and publications, and how this discourse can shape one\u27s perspective of the complex situation the DRC faces involving sexual violence

Thermal analysis and design of a cooling system for a Mach 14 nozzle

The analysis and design of a Mach 14 converging diverging nozzle wall liner is provided. The analysis indicates that: no fin on the coolant side of the nozzle wall is optimum, the thermal stresses are dominant, and the critical area is very near the throat. The molybdenum alloy TZM, with a wall thickness of 2.0 mm in the throat area, appears to be the only material capable of meeting design requirements. Additionally, cooling water at 2000 psia with a flow velocity of 25 m/s in the coolant passages is required

Phases of supersymmetric gauge theories from M-theory on G_2 manifolds

We consider M-theory on compact spaces of G_2 holonomy constructed as orbifolds of the form (CY x S^1)/Z_2 with fixed point set \Sigma on the CY. This describes N=1 SU(2) gauge theories with b_1(\Sigma) chiral multiplets in the adjoint. For b_1=0, it generalizes to compact manifolds the study of the phase transition from the non-Abelian to the confining phase through geometrical S^3 flops. For b_1=1, the non-Abelian and Coulomb phases are realized, where the latter arises by desingularization of the fixed point set, while an S^2 x S^1 flop occurs. In addition, an extremal transition between G_2 spaces can take place at conifold points of the CY moduli space where unoriented membranes wrapped on CP^1 and RP^2 become massless.Comment: 21 pages, LaTeX, v2: mistake in spectra corrected, reference added, v3: one more reference added, version published in JHE

An N=1 Triality by Spectrum Matching

On promoting the type IIA side of the N=1 Heterotic/type IIA dual pairs of [1] to M-theory on a `barely G_2 Manifold' of [2], by spectrum-matching we show a possible triality between Heterotic on a self-mirror Calabi-Yau, M-theory on the above `barely G_2-Manifold' constructed from the Calabi-Yau on the type IIA side and $F$-theory on an elliptically fibered Calabi-Yau 4-fold fibered over a trivially rationally ruled CP^1 x E base, E being the Enriques surface. We raise an apparent puzzle on the F-theory side, namely, the Hodge data of the 4-fold derived can not be obtained by a naive freely acting orbifold of CY_3(3,243) x T^2 as one might have guessed on the basis of arguments related to dualities involving string, M and (definition of) F theories. There are some interesting properties of the antiholomorphic involution used in \cite{VW} for constructing the type IIA orientifold and by us in constructing the 'barely G_2 manifold', that we also study.Comment: 14 pages, LaTex; v3: journal versio

Livatn og Høyeåna. Vannkvalitetsutvikling 1982-1993

Konsentrasjonen av totalfosfor i Livatn var i 1992-93 omlag på nivå med resultatene fra 1982. Pga. noe høyere humusinnhold i 1992-93, kan en forvente en høyere naturlig bakgrunnsverdi for fosfor. Dette kan indikere en viss reduksjon av de menneskeskapte tilførslene siden 1982. Konsentrasjonen av totalnitrogen var noe laver i 1992-93, sammenlignet med 1982 og 1985. Nitrogentilførelene vil variere naturlig fra år til år avhengig av klimaforhold, men noe av nedgangen kan skyldes avløpstiltak i området. Algemengdene var i 1992 lavere enn i 1982, men høyere enn i 1985. Store svinginger gjør det vanskelig å avgjøre om det er oppnådd en generell reduksjon av algekonsentrasjonen i løpet av de siste ti årene. Innholdet av termostabile koliforme bakterier var i 1992-93 lavere enn tilsvarende målinger 1985. Vassdraget er forsuret, men det er store pH-variasjoner gjennom året. Hele vassdraget inneholder forholdsvis mye aluminium pga. forsuringen. pH-verdien i vassdraget var noe høyere enn i 1982 og 1985. Høyeåna utgjør omlag 5% av vannføringen i Mandaslselva nedstrøms samløpet mellom de to elvene. Det må derfor være ekstreme avvik i vannføring og surhet for at Høyeåna kan påvirke vannkvaliteten i Mandalselva i nevneverdig grad. Høyeåna har gjennomgående høyere pH-verdier enn Mandalselva

Nontrivial RR two-form field strength and SU(3)-structure

We discuss how in the presence of a nontrivial RR two-form field strength and nontrivial dilaton the conditions of preserving supersymmetry on six-dimensional manifolds lead to generalized monopole and Killing spinor equations. We show that the manifold is K\"ahler in the ten-dimensional string frame if F_0^{(1,1)}=0. We then determine explicitly the intrinsic torsion of the SU(3)-structure on six-manifolds that result via Kaluza-Klein reduction from seven-manifolds with G_2-structure of generic intrinsic torsion. Lastly we give explicitly the intrinsic torsion of the SU(3)-structure for an N=1 supersymmetric background in the presence of nontrivial RR two-form field strength and nontrivial dilaton.Comment: LaTeX, 8 pages, talk given at the 35th Symposium Ahrenshoop, enlarged version of the contribution to the proceeding

Overvåking av Mjåvann nedstrøms Heftingsdalen søppelfyllplass i 1992 og 1993

Det er i 1993 ikke funnet forhold som viser at Mjåvann er merkbart påvirket av sigevann fra Heftingsdalen søppelfyllplass. Bakteriemålingene i Mjåvann viser imidlertid at søppelfyllplassen gir bakteriell påvirkning av innsjøen, trolig ved at måker fra søppelfyllplassen oppholder seg i vannet. Mjåvann hadde i 1993 omlag de samme konsentrasjonene av total-fosfor og total-nitrogen som i 1991. Basert på eksisterende fosforbelastningsmodeller er den midlere fosforkonsentrasjonen i Mjåvann akseptabel. De to nordligste stasjonene i Mjåvann hadde for høye konsentrasjoner av termostabile koliforme bakterier i badesesongen 1992 til å tilfredsstille Folkehelsas krav til badevannskvalitet