A note on cosmological Levi-Civita spacetimes in higher dimensions

We find a class of solutions to cosmological Einstein equations that generalizes the four dimensional cylindrically symmetric spacetimes to higher dimensions. The AdS soliton is a special member of this class with a unique singularity structure.Comment: 3 pages; version to appear in Phys. Rev.

PANEL GRANGEROVA UZROČNA ANALIZA ODNOSA TURIZMA I EKONOMSKOG RASTA U OSAM NAJBOLJIH TURISTIČKIH ODREDIŠTA

The tourism has economic, social and political effects and contributes to the economic development of many countries. Interaction levels of national economies increase with tourism through globalization. This study aims to test the causality relationship between the components of the tourism and economic growth. The causality relationship between the components of the tourism and economic growth by using panel causality analysis method. The findings indicate a bi-directional causality relationship between growth and tourism expenditures and tourism revenues. Tourism expenditures, tourism receipts and number of international arrivals are parameters of the tourism. Real gross domestic product is used as a growth indicator. The top eight tourist destinations are analyzed; Spain, Italy, Russia, Turkey, France, China, USA, UK. In this context; A panel dataset was created for the top eight tourism countries over the period 1995–2017. The arrivals of tourists, expenditure levels of tourists and tourism receipts are important indicators for the national economies. The positive effects of these indicators on the balance of payments, being a source of foreign exchange, employment creation, triggering investment in infrastructure and superstructure and creating a revitalizing effect in other sectors, have an important place in the region and country economy with their socio-cultural reflections.Turizam ima ekonomske, socijalne i političke učinke i doprinosi ekonomskom razvoju mnogih zemalja. Razina interakcije nacionalnih gospodarstava povećava se s turizmom kroz globalizaciju. Ovo istraživanje ima za cilj da ispita uzročno-posljedične veze između komponenti turizma i gospodarskog rasta. Odnos uzročno-posljedičnih komponenti turizma i ekonomskog rasta primjenom panel analize uzročnosti. Rezultati pokazuju dvosmjernu povezanost između rasta i turističkih rashoda i prihoda od turizma. Turistički izdaci, turistički primici i broj međunarodnih dolazaka parametri su turizma. Kao pokazatelj rasta koristi se stvarni omjer bruto domaćeg proizvoda. Analizirano je najboljih osam turističkih destinacija; Španjolska, Italija, Rusija, Turska, Francuska, Kina, SAD, Velika Britanija. U ovom kontekstu; provedena je panel panela za najboljih osam turističkih zemalja u razdoblju od 1995. do 2017. godine. Dolasci turista, razine rashoda turista i primanja od turizma važni su pokazatelji nacionalnih gospodarstava. Pozitivni učinci ovih pokazatelja na platnu bilancu, kao izvor deviza, stvaranje novih radnih mjesta, pokretanje ulaganja u infrastrukturu i nadgradnju i stvaranje revitalizirajućih učinaka u ostalim sektorima, imaju važno mjesto u regiji i ekonomiji zemlje sa svojim socijalnim -kulturna razmišljanja

Comment on the new AdS universe

We show that Bonnor's new Anti-de Sitter (AdS) universe and its D-dimensional generalization is the previously studied AdS soliton.Comment: 2 pages; version 2: major changes including the titl

Gravitational charges of transverse asymptotically AdS spacetimes

Using Killing-Yano symmetries, we construct conserved charges of spacetimes that asymptotically approach to the flat or Anti-de Sitter spaces only in certain directions. In D dimensions, this allows one to define gravitational charges (such as mass and angular momenta densities) of p-dimensional branes/solitons or any other extended objects that curve the transverse space into an asymptotically flat or AdS one. Our construction answers the question of what kind of charges the antisymmetric Killing-Yano tensors lead to.Comment: 11 pages, no figures, REVTeX 4; version 2: important corrections made; version 3: one new paragraph and 2 references added, accepted for publication in PR

Self-dual solutions of Yang-Mills theory on Euclidean AdS space

We find non-trivial, time-dependent solutions of the (anti) self-dual Yang-Mills equations in the four dimensional Euclidean Anti-de Sitter space. In contrast to the Euclidean flat space, the action depends on the moduli parameters and the charge can take any non-integer value.Comment: 11 pages, 2 figures; version 2: new references added, to appear in PR

Spherically symmetric solutions of Einstein + non-polynomial gravities

We obtain the static spherically symmetric solutions of a class of gravitational models whose additions to the General Relativity (GR) action forbid Ricci-flat, in particular, Schwarzschild geometries. These theories are selected to maintain the (first) derivative order of the Einstein equations in Schwarzschild gauge. Generically, the solutions exhibit both horizons and a singularity at the origin, except for one model that forbids spherical symmetry altogether. Extensions to arbitrary dimension with a cosmological constant, Maxwell source and Gauss-Bonnet terms are also considered

Spherically symmetric solutions of Einstein + non-polynomial gravities

We obtain the static spherically symmetric solutions of a class of gravitational models whose additions to the General Relativity (GR) action forbid Ricci-flat, in particular, Schwarzschild geometries. These theories are selected to maintain the (first) derivative order of the Einstein equations in Schwarzschild gauge. Generically, the solutions exhibit both horizons and a singularity at the origin, except for one model that forbids spherical symmetry altogether. Extensions to arbitrary dimension with a cosmological constant, Maxwell source and Gauss-Bonnet terms are also considered.Comment: 6 pages, no figures, REVTeX

Finite mass gravitating Yang monopoles

We show that gravity cures the infrared divergence of the Yang monopole when a proper definition of conserved quantities in curved backgrounds is used, i.e. the gravitating Yang monopole in cosmological Einstein theory has a finite mass in generic even dimensions (including time). In addition, we find exact Yang-monopole type solutions in the cosmological Einstein-Gauss-Bonnet-Yang-Mills theory and briefly discuss their properties

Topologically massive gravity as a Pais-Uhlenbeck oscillator

We give a detailed account of the free field spectrum and the Newtonian limit of the linearized "massive" (Pauli-Fierz), "topologically massive" (Einstein-Hilbert-Chern-Simons) gravity in 2+1 dimensions about a Minkowski spacetime. For a certain ratio of the parameters, the linearized free theory is Jordan-diagonalizable and reduces to a degenerate "Pais-Uhlenbeck" oscillator which, despite being a higher derivative theory, is ghost-free.Comment: 9 pages, no figures, RevTEX4; version 2: a new paragraph and a reference added to the Introduction, a new appendix added to review Pais-Uhlenbeck oscillators; accepted for publication in Class. Quant. Gra

EXAMINING AGGRESSION LEVELS OF ELITE RUGBY ATHLETES IN TERMS OF COMMUNICATION SKILLS

The aim of this research is to study the correlation between the aggression level and communication skills of elite rugby athletes. The study was conducted with a total of 115 rugby athletes (37 female, 78 male) who played on teams that took place in the Turkish Rugby League during 2016-2017. A 4-question demographic survey and the Kiper (1984) Aggression Scale were applied to the athletes as well as the Communication Skills inventory of Ersanlı and Balcı. The group of rugby athletes aged 25 and below was found to be at a higher bold aggression level compared to the group aged 26 and above (p<0.05). As for the passive aggression subscale scores, the group aged 25 and below was at a lower level compared to the group aged 26 and above (p<0.05). The bold aggression level of rugby athletes with a university education was higher compared to athletes with a high school and elementary education (p<0.05). In addition, a positive correlation was found between bold aggression subscale scores and total communication skills scores. As a result, it can be said that the communication skills of athletes need to be increased in order to decrease disruptive and passive aggression and increase bold behavior. As communication skills improve, the possibility of displaying aggressive approaches and behavior decrease.   Article visualizations