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Recent progress on the parton distribution functions of the photon, both real and virtual, is briefly reviewed and experimental possibilities at HERA are discussed.

https://www.keg.lu.se/en/article/meet-katherine-gough - 2026-05-25

Att föremål har massa är inte någonting vi ifrågasätter i det vardagliga livet. Att förstå \emph{varför} materiens minsta byggstenar, elementarpartiklarna, har massa är däremot inte så enkelt. I standardmodellen, som utgör den fysikaliska beskrivningen för naturens allra minsta beståndsdelar, spelar den så kallade Higgsmekanismen en avgörande roll för att förklara hur elementarpartiklar får massa.In this master thesis we consider some phenomenological aspects of two-Higgs-doublet models, both elementary and composite ones. The emphasis is on calculating and understanding first order phase transitions in such models, constrained to be in agreement with existing collider data on the Higgs sector. We also consider the contribution to the gravitational wave background of the universe that woul

Tanken att beskriva världen utifrån dess minsta beståndsdelar har levt ibland oss ända sedan Demokritos leverne. Det dröjde dock drygt 2300 år innan mänskligheten nådde en någorlunda tillfredställande teori för att förklara elementarpartiklarnas egenskaper och interaktioner, den så kallade Standardmodellen. Sedan dess har jakten efter en mer allmängiltig teori pågått. Denna uppsats behandlar en sThe thesis treats the construction of a supersymmetric model, inspired by an E8 unfication scenario. Via the introduction of adjoint representation chiral superfields, in combination with the inclusion of a global generation symmetry, the Standard Model fermion candidates are protected from gaining any mass until electroweak symmetry breaking. In addition, an accidental global baryon symmetry proh

En medlemsstats nationella inkomstskatteregel som hindrar eller inskränker EUF-fördragets bestämmelser om fri rörlighet kan anses vara rättfärdigad om den uppfyller vissa kriterier. Det centrala i denna uppsats är den bedömning som EU-domstolen gör för att avgöra huruvida regeln är rättfärdigad eller ej. Detta innebär att uppsatsen innehåller en redogörelse för det så kallade rule of reason-testetA member state’s national income tax legislation, which prevents or restricts the provisions on free movement in the Treaty of the Functioning of the European Union, can be justified if it meets certain criteria. The essence of this thesis is the assessment made by the European Court of Justice (the Court) to determine whether the legislation is justified or not. This means that this thesis contai

The primary objective of this study is to compare the accuracy of two risk models, International Heart Transplantation Survival Algorithm (IHTSA), developed using deep learning technique, and Index for Mortality Prediction After Cardiac Transplantation (IMPACT), to predict survival after heart transplantation. Data from adult heart transplanted patients between January 1997 to December 2011 were c

A simple model for the gluon structure function at small x is presented, which gives an intuitive picture of the transition between the DGLAP and BFKL regimes

In this contribution I want to discuss three phenomena, where effects of fluctuations are very important, multiplicity distributions, diffractive excitation, and nucleus collisions.

Proceedings of the Workshop on Eta Physics: Prospects of Precision Measurments with the CELSIUS / WASA Facility, Uppsala, Sweden, 25-27 Oct 2001.

Spectra of hot (type B) stars obtained with the Far Ultraviolet Spectroscopic Explorer (FUSE) satellite in the region 1000-1200

Research Services will help you along the way, both with funding and support. Rolf Lood, Docent at Infectious medicine at IKVL, and currently on his way to Tanzania, is the coordinator of a project in Africa, and encourages more people to try out the role of coordinator. What is it like to be a coordinator? "Wonderful and stressful at the same time! Getting a group of about 50 researchers, represe

https://www.intramed.lu.se/en/article/become-coordinator-eu-project - 2026-05-25

We present an analytical algorithm for deriving the shapes of the deformable mirrors to be used for multiconjugate adaptive correction on a large telescope. The algorithm is optimal in the limit where the overlap of the wave-front contributions from relevant atmospheric layers probed by the guide stars is close to the size of the pupil. The fundamental principle for correction is based on a minimi

Do you have a lot of ideas but nobody and no time to pursue them? Do as Nicole van Der Burg and get an intern through Jobbsprånget ("job leap"). Why did you apply to Jobbsprånget?– As a small lab we have a lot of big ideas with hardly any free time to pursue them, especially with patients sample collection taking up half our week. We knew that if we had a little more time to get some preliminary d

https://www.intramed.lu.se/en/article/internship-programme-jobbspranget-was-just-kickstart-we-needed - 2026-05-25

The new generation of extremely large telescopes will have adaptive optics. Due to the complexity and cost of such systems, it is important to simulate their performance before construction. Most systems planned will have Shack-Hartmann wavefront sensors. Different mathematical models are available for simulation of such wavefront sensors. The choice of wavefront sensor model strongly influences c

For the very first time we present 3D simulations of planets embedded in stellar irradiated discs. It is well known that thermal effects could reverse the direction of planetary migration from inwards to outwards, potentially saving planets in the inner, optically thick parts of the protoplanetary disc. When considering stellar irradiation in addition to viscous friction as a source of heating, th

Dust grains migrating under Poynting-Robertson drag may be trapped in mean-motion resonances with planets. Such resonantly trapped grains are observed in the Solar system. In extrasolar systems, the exozodiacal light produced by dust grains is expected to be a major obstacle to future missions attempting to directly image terrestrial planets. The patterns made by resonantly trapped dust, however,