This paper comprises the written version of the lectures on string theory delivered at the 31st British Universities Summer School on Theoretical Elementary Particle Physics which was held in Manchester, England, August 28 – September 12 2001.

I summarize here and discuss the results of presently operating neutrino telescopes in searching for a singnal of dark matter weakly interacting massive particles (WIMPs).

A natural explanation for the smallness of the neutrino mass requires them to be Majorana particles violating lepton number by two units. Since lepton number violation can have several interesting consequences in particle physics and cosmology, it is of utmost importance to find out if there is lepton number violation in nature and what is its magnitude. The neutrinoless double beta decay exper...

With almost 0.5 fb −1 of p¯ p-collisions delivered in Tevatron Run II, both experiments CDF and DØ are reporting first results from a vast number of search analyses. This article summarizes the current status of Tevatron searches for Higgs bosons within the Standard Model and its extensions as well as direct searches for supersymmetric particles. Signatures for production of squarks, gluinos, c...

With almost 0.5 fb −1 of p¯ p-collisions delivered in Tevatron Run II, both experiments CDF and DØ are reporting first results from a vast number of search analyses. This article summarizes the current status of Tevatron searches for Higgs bosons within the Standard Model and its extensions as well as direct searches for supersymmetric particles. Signatures for production of squarks, gluinos, c...

I give a short review of the holographic approach to quantum gravity, with emphasis on its application to deriving the properties of elementary particles.

To embed the seesaw mechanism in the MSSM, two or three right-handed neutrino supermultiplets, Ni, have to be added to the model. In this framework, the supersymmetry breaking potential will include a new term called neutrino B-term: MBνÑÑ/2. In this talk, we present a toy model that generates a large neutrino B-term keeping other supersymmetry breaking parameters small. We then review the cons...

The electron, which has been pictured as an elementary particle ever since J.J. Thomson’s e/m-measurement in 1897, and the relativistic motion of which is described by the Dirac equation, is discussed in the light of the recent progress made in Science of Complex Systems. Theoretical arguments and experimental evidences are presented which show that such an electron exhibits characteristic prop...

initiated a search for an electric dipole moment (EDM) of the neutron and obtained what was considered at the time a remarkably precise result, consistent with zero.1 Thus began a long line of ever more sensitive EDM experiments on neutrons, atoms, and molecules. Although no EDM has yet been found, the limits set have had decisive influences on elementary particle theories. Now, experiments und...

Immobilised titanium dioxide (TiO2) in membrane structures has recently become attractive. This is due to the elimination of the separation step after the process of photocatalytic degradation. The efficiency of the TiO2 surface area exposed to UV light as the main important parameter needs to be considered. The immobilisation of TiO2 nanoparticles in the polyvinylidene fluoride (PVDF) membrane...