The equilibrium thermodynamic properties of the SU(N) plasma at finitetemperature are studied non-perturbatively in the large-N limit, via latticesimulations. We present high-precision numerical results for the pressure,trace of the energy-momentum tensor, energy density and entropy density ofSU(N) Yang-Mills theories with

We show that the event-by-event fluctuations of the transverse size of theinitial source, which follow directly from the Glauber treatment of theearliest stage of relativistic heavy-ion collisions, cause, after hydrodynamicevolution, fluctuations of the transverse flow velocity at hadronic freeze-out.This in

Using some assumptions about the correlation function of velocity in aturbulent flow, a cylindrically symmetric tube-like solution is obtained. It isproposed that this turbulent flow is similar to a flux tube in quantumchromodynamics. Using similar assumptions for quantum chromodynamics, a

The dynamical density fluctuations around QCD critical point (CP) areanalyzed using relativistic dissipative fluid dynamics, and we show that thesound mode around the QCD CP is strongly attenuated whereas the thermalfluctuation stands out there. We speculate that if possible suppression

We present a new formalism for finding the low-energy effective Lagrangian ofGoldstinos and other fields. This Lagrangian is written using standardsuperspace and the superfields are constrained to include only the lightdegrees of freedom. The Goldstino resides in a (constrained) chiral

We have studied $\Delta(54)\times Z_2$ flavor model for leptons and sleptons.The tri-bimaximal mixing can be reproduced for arbitrary neutrino masses ifvacuum alignments of scalar fields are guaranteed. The deviation from thetri-bimaximal mixing of leptons is predicted. The predicted upper bound

We study a simple extension of the standard model to tackle the neutrinomasses, matter-antimatter asymmetry and dark matter (DM) in the universe, andthe lithium problems. In our model, the baryon asymmetry is achieved by the lowenergy leptogenesis mechanism without requiring

We uncover a novel solution of the 't Hooft anomaly matching conditions forQCD. Interestingly in the perturbative regime the new gauge theory, ifinterpreted as a possible QCD dual, predicts the critical number of flavorsabove which QCD in the nonperturbative regime,

We consider zero-temperature transitions from conformal to non-conformalphases in quantum theories. We argue that there are three generic mechanismsfor the loss of conformality in any number of dimensions: (i) fixed point goesto zero coupling, (ii) fixed point runs off to

This non-technical review article is aimed at readers with some physicsbackground, including beginning research students. It provides a panoramic viewof the main theoretical developments in high energy physics since its inceptionmore than half a century ago, a period in which

We present a comprehensive overview of an extension of the Standard Modelthat contains three right-handed (sterile) neutrinos with masses below theelectroweak scale [the Neutrino Minimal Standard Model, (nuMSM)]. We considerthe history of the Universe from the inflationary era through today

We investigate the causality and stability of relativistic dissipative fluiddynamics in the absence of conserved charges. We perform a linear stabilityanalysis in the rest frame of the fluid and find that the equations ofrelativistic dissipative fluid dynamics are always stable.

Jet-quenching and photon production at high transverse momentum are studiedat RHIC energies, together with the correlation between jets and photons. Theenergy loss of hard partons traversing the hot QGP is evaluated in the AMYformalism, consistently taking into account both induced

In this talk I give an overview of soft collinear effective theory (SCET),including a discussion of some recent advances. First, I briefly cover thefoundation upon which SCET is built, namely QCD factorization, and review thetheoretical framework of SCET. Next, I

We derive two general criteria that can be used to constrain the initial timeof the onset of 2nd-order conformal viscous hydrodynamics in relativisticheavy-ion collisions. We show this explicitly for 0+1 dimensional viscoushydrodynamics and discuss how to extend the constraint to

Extrapolating the Standard Model to high scales using the renormalisationgroup, three possibilities arise, depending on the mass of the Higgs boson: ifthe Higgs mass is large enough the Higgs self-coupling may blow up, entailingsome new non-perturbative dynamics; if the Higgs

This thesis work analyzes basic field theoretical aspects of a class ofmodels motivated by orientifold vacua of string theory and some of theirphenomenological applications at the Large Hadron Collider. They extend thegauge structure of the Standard Model by anomalous extra

We briefly review some recent Cold Dark Matter (CDM) models. Our main focusare charge symmetric models of WIMPs which are not the standard SUSY LSP's(Lightest Supersymmetric Partners). We indicate which experiments are mostsensitive to certain aspects of the models. In

The MiniBooNE experiment at Fermilab was designed to be a definitive test ofthe LSND evidence for neutrino oscillations and has recently reported firstresults of a search for electron-neutrino appearance in a muon-neutrino Boosterbeam. No significant excess of events was observed