34,983 research outputs found
The effect of a light radion on the triviality bound on higgs mass
In this paper we study how the triviality bound on higgs mass in the context
of the SM is modified by a light stabilized radion of the Goldberger-Wise
variety. Our approach is inherently perturbative. Including the radion
contribution to \bt(\l) and \bt(g_t) to one loop we evolve the higgs self
coupling \l from the cut off \L(=\vphi) down to the EW scale .
The triviality bound is obtained by requiring that \l(\L) = \sqrt{4 \pi}
which is the perturbative limit. We also study the effect of small changes in
the UVBC on the triviality bound both in the presence and absence of a light
radion.Comment: 9 pages, latex, 2 eps figure
Identifying new physics contributions in the Higgs sector at linear e+e- colliders
Loop driven decay modes of the Higgs are sensitive to new physics
contributions because of new particles in the loops. To highlight this we look
at the dilepton-dijet signal in the dominant Higgs production channel at a
linear e+e- collider. We show that by taking a simple ratio between
cross-sections of two different final states such contributions can be very
easily identified.Comment: Latex 4 pages, 2 eps figures (style files included). Talk given at
the linear collider workshop LCWS06, Bangalore, March 200
Microcanonical Lattice Gas Model for Nuclear Disassembly
Microcanonical calculations are no more difficult to implement than canonical
calculations in the Lattice Gas Model. We report calculations for a few
observables where we compare microcanonical model results with canonical model
results.Comment: 7 pages, Revtex, 3 postscript figure
Spacecraft Dynamics and Control Program at AFRPL
A number of future DOD and NASA spacecraft such as the space based radar will be not only an order of magnitude larger in dimension than the current spacecraft, but will exhibit extreme structural flexibility with very low structural vibration frequencies. Another class of spacecraft (such as the space defense platforms) will combine large physical size with extremely precise pointing requirement. Such problems require a total departure from the traditional methods of modeling and control system design of spacecraft where structural flexibility is treated as a secondary effect. With these problems in mind, the Air Force Rocket Propulsion Laboratory (AFRPL) initiated research to develop dynamics and control technology so as to enable the future large space structures (LSS). AFRPL's effort in this area can be subdivided into the following three overlapping areas: (1) ground experiments, (2) spacecraft modeling and control, and (3) sensors and actuators. Both the in-house and contractual efforts of the AFRPL in LSS are summarized
Universality in Fluid Domain Coarsening: The case of vapor-liquid transition
Domain growth during the kinetics of phase separation is studied following
vapor-liquid transition in a single component Lennard-Jones fluid. Results are
analyzed after appropriately mapping the continuum snapshots obtained from
extensive molecular dynamics simulations to a simple cubic lattice. For near
critical quench interconnected domain morphology is observed. A brief period of
slow diffusive growth is followed by a linear viscous hydrodynamic growth that
lasts for an extended period of time. This result is in contradiction with
earlier inclusive reports of late time growth exponent 1/2 that questions the
uniqueness of the non-equilibrium universality for liquid-liquid and
vapor-liquid transitions.Comment: 6 pages, 5 figure
Properties of Accretion Shocks in Viscous Flows with Cooling Effects
Low angular momentum accretion flows can have standing and oscillating shock
waves. We study the region of the parameter space in which multiple sonic
points occur in viscous flows in presence of various cooling effects such as
bremsstrahlung and Comptonization. We also quantify the parameter space in
which shocks are steady or oscillating. We find that cooling induces effects
opposite to heating by viscosity even in modifying the topology of the
solutions, though one can never be exactly balanced by the other due to their
dissimilar dependence on dynamic and thermodynamic parameters. We show that
beyond a critical value of cooling, the flow ceases to contain a shock wave.Comment: 18 pages, 12 figures, Accepted for Publication in Int. J. Mod. Phys.
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