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String theory and space-time singularities
Martin O'Loughlin, 2011, published scientific conference contribution

Found in: osebi
Keywords: teorija strun, gravitacija, singularnosti
Published: 15.10.2013; Views: 6112; Downloads: 108
URL Fulltext (0,00 KB)

Half BPS states in AdS[sub]5 x Y[sup]p,q
Edi Gava, Giuseppe Milanesi, Kumar S. Narain, Martin O'Loughlin, 2008, original scientific article

Found in: osebi
Keywords: modeli, supergravitacija, teorija strun, holografija
Published: 15.10.2013; Views: 5120; Downloads: 19
URL Fulltext (0,00 KB)

Penrose limits, singularities and DLCQ
Martin O'Loughlin, 2008, published scientific conference contribution (invited lecture)

Found in: osebi
Keywords: teorija strun, kvantna gravitacija
Published: 15.10.2013; Views: 6041; Downloads: 19
URL Fulltext (0,00 KB)

Cosmic ray induced micro black hole showers
Maria Vittoria Garzelli, Martin O'Loughlin, Saeede Nafooshe, 2012, published scientific conference contribution

Found in: osebi
Keywords: kozmični žarki, ekstremne dimenzije, mikro črne luknje
Published: 15.10.2013; Views: 4843; Downloads: 20
URL Fulltext (0,00 KB)

Horizon Shells and BMS-like soldering transformations
Martin O'Loughlin, Matthias Blau, 2016, original scientific article

Abstract: We revisit the theory of null shells in general relativity, with a particular emphasis on null shells placed at horizons of black holes. We study in detail the considerable freedom that is available in the case that one solders two metrics together across null hypersurfaces (such as Killing horizons) for which the induced metric is invariant under translations along the null generators. In this case the group of soldering transformations turns out to be infinite dimensional, and these solderings create non-trivial horizon shells containing both massless matter and impulsive gravitational wave components. We also rephrase this result in the language of Carrollian symmetry groups. To illustrate this phenomenon we discuss in detail the example of shells on the horizon of the Schwarzschild black hole (with equal interior and exterior mass), uncovering a rich classical structure at the horizon and deriving an explicit expression for the general horizon shell energy- momentum tensor. In the special case of BMS-like soldering supertranslations we find a conserved shell-energy that is strikingly similar to the standard expression for asymptotic BMS supertranslation charges, suggesting a direct relation between the physical properties of these horizon shells and the recently proposed BMS supertranslation hair of a black hole.
Found in: osebi
Keywords: Black Holes, Classical Theories of Gravity, Space-Time Symmetries
Published: 10.03.2016; Views: 3797; Downloads: 0
.pdf Fulltext (333,17 KB)

Properties of Null Hypersurfaces
Hovhannes Demirtshyan, 2016, master's thesis

Abstract: The aim of this thesis is to investigate the effects that a lightlike singular hypersurface can have on a congruence of timelike (spacelike) geodesics and to extend the existing theory to the case of null geodesics. The introduction discusses the applications of singular hypersurfaces for the description of physical phenomena, their major classfications and includes a short discussion of the two theoretical approaches that exist to study singular hypersurfaces. The second chapter contains detailed description of these approaches. The theoretical frameworks for both cases of lightlike and timelike (spacelike) hypersurfaces are developed. This chapter also discusses the application of these theories to the case when the hypersurface contains a plane fronted lightlike signal. The final chapter starts with a discussion of the effects that a lightlike singular hypersurface can have on a congruence of timelike (spacelike) geodesics. A new approach to these calculations is presented together with an extension of the theory to the case of a congruence of null geodesics. At the end of the chapter a concrete example and its similarities with the case of timelike geodesics is discussed. In conclusion, the thesis suggests a new mathematical framework for describing a congruence of null geodesics crossing a singular null hypersurface. The results may be applied in experimental physics to detect impulsive signals which are located in singular null hypersurfaces and to this end there is a discussion of the properties and possibilities for a detector of impulsive lightlike signals, which include gravitational waves.
Found in: osebi
Keywords: singular hypersurface, impulsive signal, gravitational wave, null geodesic, timelike (spacelike) geodesic
Published: 16.05.2016; Views: 6319; Downloads: 248
.pdf Fulltext (475,54 KB)

Detection of gravitational waves
Gregor Mrak, 2016, undergraduate thesis

Abstract: This report mainly focuses on the first two detections of gravitational waves (GW). At the beginning of the thesis the historical background of GW explorations is discussed by pointing out some arguments and researchers that were essential for the progress. Continuing with the derivation based on the theory of general relativity, in order to express where certain properties derive. In the main part of the report, the subject of interest becomes Laser interferometer gravitational-wave observatory (LIGO), beginning with the problems occurring on the way to detection, describing different noise sources one by one. After pointing out the problems, solutions are discussed, namely the technological advances made to lower the background noise as much as possible. The chapter (4) points out different parts of the detector which are implemented to produce a clearer signal. As only physical noise reduction methods are not enough, digital signal processing algorithms are mentioned as well which are used to analyze the data. Subsequently the required theoretical knowledge is given, so the main part ends with the analysis of actual data taken from LIGO’s public release for both GW150914 and GW151226 events (first and second official detections). In the conclusion of the report a brief descriptions of various detectors besides Ligo are given and some insight of the future detectors that are planned to be built.
Found in: osebi
Keywords: Gravitational waves, Ligo, Binary black hole merger, gravitational wave interferometry
Published: 27.09.2016; Views: 6013; Downloads: 294
.pdf Fulltext (3,27 MB)

Martin Pogačar, 2011, doctoral dissertation

Found in: osebi
Keywords: spomin, zgodovina, digitalna okolja, Jugoslavija
Published: 15.10.2013; Views: 4705; Downloads: 185
URL Fulltext (0,00 KB)
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Vzpostavitev projektne pisarne v izbrani občinski upravi
Martin Bizjak, 2011, undergraduate thesis

Found in: osebi
Keywords: upravljanje projektov, projektna pisarna, projektni kolegij, Google Docs, program Gantter, diplomske naloge
Published: 15.10.2013; Views: 5360; Downloads: 465
URL Fulltext (0,00 KB)
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Strateško načrtovanje v dejavnosti turizma in gostinstva: študija primera turistične destinacije v izbrani mestni občini
Martin Bizjak, 2015, master's thesis

Abstract: V magistrskem delu obravnavamo problematiko strateškega managementa v izbrani turistični destinaciji, ker smo na področju raziskovanja in predhodnega preučevanja omenjene problematike identificirali raziskovalno vrzel. Namen magistrskega dela je, na podlagi sistematičnega pregleda domače in tuje strokovne literature ter zasnovi konceptualnega modela strategije razvoja turizma, empirično preveriti stopnjo razvitosti strateškega načrtovanja turistične in gostinske dejavnosti v izbrani turistični destinaciji ter podati morebitne predloge za izboljšanje stanja. Za empirični del raziskave smo uporabili kvalitativno metodo raziskovanja in oblikovali raziskovalna vprašanja ter nato opravili intervju s štirimi predstavniki turističnih ponudnikov in tremi predstavniki organizacij, ki so vpete v lokalni turizem. Ugotovili smo, da tako konkurenčne prednosti kot družbena odgovornost in vrednote statistično značilno vplivajo na uspešnost turističnega podjetja. Izidi iz raziskave predstavljajo prispevek k širšemu vpogledu na strateški management v turizmu ter bodo uporabni za vse tiste, ki se teoretično, raziskovalno ali strokovno ukvarjajo s to dejavnostjo.
Found in: osebi
Keywords: Management, organizacija, raziskava, strateški management, turistična destinacija
Published: 29.09.2015; Views: 5575; Downloads: 448
.pdf Fulltext (1,06 MB)

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