From New to Large Field Inflation: Comparison with WMAP3

We briefly summarize and update a class of inflationary models from the early eighties based on a quartic (Coleman-Weinberg) potential for a gauge singlet scalar (inflaton) field. For vacuum energy scales comparable to the grand unification scale, the scalar spectral index n_s=0.94-0.97, in very good agreement with the WMAP three year results. The tensor to scalar ratio r<~0.14 while alpha=dn_s/d ln k=~-10^-3. For vacuum energy scales >~10^16 GeV, the inflationary scenario switches from `new' to `large-field' (V\propto\phi^2) inflation. An SO(10) version naturally explains the observed baryon asymmetry via non-thermal leptogenesis.Comment: 7 pages, 4 figures, 1 table. Based on a talk given by Q. Shafi at the 2nd International Conference on The Dark Side of the Universe (DSU 2006), Madrid (Spain), 20-24 June 200

Non-Canonical MSSM, Unification, And New Particles At The LHC

We consider non-canonical embeddings of the MSSM in high-dimensional orbifold GUTs based on the gauge symmetry SU(N), N=5,6,7,8. The hypercharge normalization factor k_Y can either have unique non-canonical values, such as 23/21 in a six-dimensional SU(7) model, or may lie in a (continuous) interval. Gauge coupling unification and gauge-Yukawa unification can be realized in these models by introducing new particles with masses in the TeV range which may be found at the LHC. In one such example there exist color singlet fractionally charged states.Comment: 1+25 pages, 5 figures. v2: Introduction revised, sections reordered, figure 4 correcte

Coleman-Weinberg Potential In Good Agreement With WMAP

We briefly summarize and update a class of inflationary models from the early eighties based on a quartic (Coleman-Weinberg) potential for a gauge singlet scalar (inflaton) field. For vacuum energy scales comparable to the grand unification scale, the scalar spectral index n_s=0.94-0.97, in very good agreement with the WMAP three year results. The tensor to scalar ratio r<~0.14, while alpha=dn/dlnk is =~-10^-3. An SO(10) version naturally explains the observed baryon asymmetry via non-thermal leptogenesis.Comment: v1: 6 pages, 1 table. v2: minor corrections. v3: 8 pages, added some details, comments, references and 3 figures. v4: minor corrections, published versio

Comparison of Speed and Agility between Handball and Volleyball Players

The purpose of the study was to compare the speed and agility between handball and volleyball players of Annamalai University. We have selected thirty (30) male students who play either handball or Volleyball from Department of Physical Education and Sports Sciences, Annamalai University. These subjects were equally classified into two groups (handball = 15 &amp; Volleyball = 15). The selected subjects were tested on speed by 50 yard dash and agility by shuttle run which was selected as criterion variable. The collected data was analysed using independent t test to find out the significant difference between handball and volleyball players. The result of our study showed that handball players have greater speed than volleyball players (t = 5.82). However, no difference is elicited between handball and volleyball players (t = 0.82). It is concluded that speed and agility plays a vital role in both game, however handball players showed greater speed than volleyball players may be because of intermittent nature and employ sprint during attack and counter attack during the game

Supersymmetric And Smooth Hybrid Inflation In The Light Of WMAP3

In their minimal form both supersymmetric and smooth hybrid inflation yield a scalar spectral index n_s close to 0.98, to be contrasted with the result n_s=0.951+0.015-0.019 from WMAP3. To realize better agreement, following hep-ph/0604198, we extend the parameter space of these models by employing a non-minimal Kaehler potential. We also discuss non-thermal leptogenesis by inflaton decay and obtain new bounds in these models on the reheat temperature to explain the observed baryon asymmetry.Comment: 21 pages, 12 figures, revtex4. v2: minor revisions, additional references, to appear in PR

Reheat temperature in supersymmetric hybrid inflation models

The allowed range of parameters for supersymmetric hybrid inflation and its extensions are investigated. The lower bound on the reheat temperature T_r in these models with hierarchical right handed neutrinos is found to be 3*10^7 GeV. (T_r as low as 100 GeV is possible for quasi degenerate right handed neutrinos.) We also present revised estimates for the scalar spectral index and the symmetry breaking scale associated with inflation.Comment: 15 pages, 8 figures, revtex4. v2: minor changes, matches published versio

Supersymmetric Inflation, Baryogenesis and \nu_{\mu} - \nu_{\tau} Oscillations

In a supersymmetric left-right symmetric model, inflation, baryogenesis (via leptogenesis) and neutrino oscillations can become closely linked. A familiar ansatz for the neutrino Dirac masses and mixing of the two heaviest families, together with the MSW resolution of the solar neutrino puzzle, imply that 1 eV <_\sim m_{\nu _{\tau }<_\sim 9 eV. The predicted range for the mixing angle \theta _\mu \tau will be partially tested by the Chorus/Nomad experiment. The CP violating phase \delta _{\mu \tau } is also discussed.Comment: 10 pages RevTeX 3 eps figures. email: [email protected]