We present the study of the dynamics of the geometrical tachyon field on an unstable D3-brane in the background of a bulk tachyon field of a D3-brane solution of Type-0 string theory. We find that the geometrical tachyon potential is modified by a function of the bulk tachyon and inflation occurs at weak string coupling, where the bulk tachyon condenses, near the top of the geometrical tachyon ...

In light of the recent observations of type Ia supernovae suggesting an accelerating expansion of the Universe, we wish in this paper to point out the possibility of using a complex scalar field as the quintessence to account for the acceleration. In particular, we extend the idea of Huterer and Turner in deriving the reconstruction equations for the complex quintessence, showing the feasibilit...

The corrected Hohenberg-Kohn-Sham and corrected Harris total energy functionals recently proposed [B. Zhou and Y. A. Wang, J. Chem. Phys. 128, 084101 (2008)] have been generalized to the Hartree-Fock method. We have tested the functionals on a few molecular systems and found them to be very useful in accelerating the convergence of the total energy during a self-consistent field process.

A newly developed high-performance multiimager VGA camera array is described. Designed for synchronization, bandwidth, and economy within a videoconferencing application, and demonstrated initially through novel video mosaicking, the system shows promise for accelerating the new field of multi-viewpoint imaging. We describe the camera system’s design, control, performance characteristics, use i...

As our frame of reference, we begin with Cartesian coordinates in 3space R. Assume the frame is non-accelerating (inertial). Suppose there is a mass m at a fixed point in space r′ = (x′, y′, z′). This is a point source. It produces a gravity field around it, which can be sensed by a test mass at another point in space. How strong and in what direction is the tug of the field as it acts on the t...

Electrospray thrusters work by extracting ions or charged droplets directly from a liquid surface using an electrostatic field and accelerating them in that field to produce thrust [1]. This method could lead to more efficient and precise thrusters for space propulsion applications. Emission occurs from sharp emitter tips, which enhance the electric field and constrain the emission location. Th...