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"Dikaji masalah massa neutrino berdasarkan model GUT (Grand United Theory) SU(6) 5D setelah mengalami perusakan simetri menjadi SU(3)CSU(3)H U(1)C melalui mekanisme Scherk-Schwarz. Dari level SU(3)CSU(3)H U(1)C ini diperoleh lagrangian massa partikel neutrino yang berasal dari representasi f6g, f15g, f6g, dan f15g untuk diaplikasikan mekanisme seesaw. Lagrangian massa ini yang terdiri atas suku neutrino Dirac dan suku neutrino Majorana dibentuk kembali dalam bentuk matriks massa. Dari matriks massa ini kemudian didapatkan nilai eigen massa (mass eigenvalue) yang merupakan massa efektif neutrino.

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The neutrino mass problem based on GUT (Grand Unified Theory) SU(6) 5D model breaking to SU(3)C SU(3)H U(1)C by Scherk-Schwarz mechanism is discussed. From SU(3)C SU(3)H U(1)C is obtained neutrino mass lagrangian which from f6g, f15g, f6g, and f15g representation for applied seesaw mechanism. This mass lagrangian which consists of Dirac and Majorana neutrino term is formed again into a mass matrix. From this mass matrix we got mass eigenvalues which are the neutrino effective mass."

"We impose the Higgs mechanism to break the Grand Unified Theory based on SU(6) symmetry, SU(6) GUT. We investigate and search for the Higgs multiplets which are approriate to generate masses for both fermions and gauge bosons. We have found that the most minimal Higgs multiplets are < 15 >,< 20 > and < 21 > to realize three steps of symmetry breaking in SU(6) GUT down to the standar SU(2) × U(1) model. However within this minimal SU(6) GUT, we can reproduce only some fermions spectra as N4e, νe,N6e, Ne and d quarks, although we have deployed the most general forms of Higgs multiplets. On the other hand, the present approach have succeeded in generating the reguler gauge bosons, W±, Z0 and Aµ."

"Telah dibangun Lagrangian baru serta dilakukan perhitungan analitik tensor energi-momentum untuk fluida QCD yang mengandung suku viskositas. Suku viskositas ini dibuat dengan asumsi bahwa persamaan gerak yang diperoleh mereproduksi persamaan gerak hidrodinamika relativistik. Suku viskositas mengakibatkan perusakan simetri fluida QCD. Memakai Lagrangian yang telah dibangun, dihitung distribusi jumlah partikel memakai teori kinetik dan resolusi Cooper- Frye. Ditunjukkan bahwa distribusi jumlah partikel memiliki kontur yang samamdengan hasil perhitungan sebelumnya memakai persamaan gerak hidrodinamika relativistik.

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A new Lagrangian and energy momentum tensor for fluid QCD with viscous term have been developed and calculated analytically. The viscous term has been constructed assuming that the generated equation of motion should reproduce the known relativistic hydrodynamics. The viscous term induces symmetry breaking of fluid QCD. Using the Lagrangian, the particle number distribution has been calculated using kinetic theory and Cooper-Frye prescription. It is shown that the distribution has the same contour as previous results calculated using the equation of motion of relativistic hydrodynamics."