Comment on "w and w' of scalar field models of dark energy" [arXiv:astro-ph/0510598] (2009)
Chen, Chien-Wen, Gu, Je-An, Chen, Pisin
We comment on the calculation mistake in the paper "w and w' of scalar field models of dark energy" by Takeshi Chiba [arXiv:astro-ph/0510598], where w is the dark energy equation of state and w' is...
Stress-Energy Tensor Induced by Bulk Dirac Spinor in Randall-Sundrum Model (2009)
Shao, Shu-heng, Chen, Pisin, Gu, Je-An
Motivated by the possible extension into a supersymmetric Randall-Sundrum (RS) model, we investigate the properties of the vacuum expectation value (VEV) of the stress-energy tensor for a quantized...
Quantum Vacuum Structure and Cosmology (2009)
Rafelski, Johann, Labun, Lance, Hadad, Yaron, Chen, Pisin
Short review of riddles that lie at the intersection of quantum theory, particle physics and cosmology; dark energy as false vacuum; discussion of a possible detection experiment.
Constraints on the Phase Plane of the Dark Energy Equation of State (2009)
Chen, Chien-Wen, Chen, Pisin, Gu, Je-An
Classification of dark energy models in the plane of w and w', where w is the dark energy equation of state and w' its time-derivative in units of the Hubble time, has been studied in the literature....
Comments on "Modeling Galaxy Halos Using Dark Matter with Pressure" (2009)
We comment on the calculational mistake in the paper "Modeling galaxy halos using dark matter with pressure" by Somnath Bharadwaj and Sayan Kar. The authors made a mistake while calculating the...
Consistency Test of Dark Energy Models (2009)
Chen, Chien-Wen, Gu, Je-An, Chen, Pisin
Recently we proposed a new approach to the testing of dark energy models based on the observational data. In that work we focused particularly on quintessence models for demonstration and invoked a...
One of the most tantalizing questions in astronomy and astrophysics, namely the origin and the evolution of the cosmic accelerators that produce the highest energy cosmic rays (UHECR), may be best...
A New Type of Plasma Wakefield Accelerator Driven by Magnetowaves (2008)
Chen, Pisin, Chang, Feng-Yin, Lin, Guey-Lin, Noble, Robert J., Sydora, Richard
We present a new concept for a plasma wakefield accelerator driven by magnetowaves (MPWA). This concept was originally proposed as a viable mechanism for the "cosmic accelerator" that would...
Ultra High Energy Cosmic Ray Puzzle and the Plasma Wakefield Acceleration (2008)
Chang, Feng-Yin, Chen, Pisin, Lin, Guey-Lin, Noble, Robert J., Reil, Kevin, Sydora, Richard
Magnetowave induced plasma wakefield acceleration (MPWA) in a relativistic astrophysical outflow has been proposed as a viable mechanism for the acceleration of cosmic particles to ultra high...
Influence of Plasma Collective Effects on Cosmological Evolution (2008)
It is well-known that the universe was in a plasma state both before decoupling and after reionization. However, the conventional wisdom has been that the plasma effects are largely Debye-shielded...
A New Approach to Testing Dark Energy Models by Observations (2008)
Gu, Je-An, Chen, Chien-Wen, Chen, Pisin
We propose a new approach to the consistency test of dark energy models with observations. To test a category of dark energy models, we suggest introducing a characteristic Q(z) that in general...
Cosmological Constant as a Manifestation of the Hierarchy (2007)
There has been the suggestion that the cosmological constant as implied by the dark energy is related to the well-known hierarchy between the Planck scale, $M_{\rm Pl}$, and the Standard Model scale,...
Radiation Reaction In A Continuous Focusing Channel (2007)
Zhirong Huang, Pisin Chen, Ronald D. Ruth
We show that the radiation damping rate of the transverse action of a particle in a straight, continuous focusing system is independent of the particle energy, and that no quantum excitation is...
Pair Creation From Beam-Beam Interaction In Linear Colliders (2007)
Toshiaki Tauchi, Kaoru Yokoya, Pisin Chen
this paper, we derive the analytic formulae for the integrated cross-section of this process and we also modify the computer code ABEL(Analysis of Beam-beam Effects in Linear colliders) to include...
Radiation And Radiation Reaction In Focusing Channels (2007)
Zhirong Huang, Pisin Chen, Ronald D. Ruth
We show that the radiation damping rate of the transverse action of a particle in a straight, continuous focusing system is independent of the particle energy, and that no quantum excitation is...
Magnetowave Induced Plasma Wakefield Acceleration for Ultra High Energy Cosmic Rays (2007)
Chang, Feng-Yin, Chen, Pisin, Lin, Guey-Lin, Reil, Kevin, Sydora, Richard
Magnetowave induced plasma wakefield acceleration (MPWA) in a relativistic astrophysical outflow has been proposed as a viable mechanism for the acceleration of cosmic particles to ultra high...
Plasma Suppression of Large Scale Structure Formation in the Universe (2007)
We point out that during the reionization epoch of the cosmic history, the plasma collective effect among the ordinary matter would suppress the large scale structure formation. The imperfect Debye...
Dark energy and the hierarchy problem (2006)
The well-known hierarchy between the Planck scale (~10^{19}GeV) and the TeV scale, namely a ratio of ~10^{16} between the two, is coincidentally repeated in a inverted order between the TeV scale and...
A Semi-Classical Treatment of Channeling Radiation Reaction (1996)
Zhirong Huang, Pisin Chen, Ronald D. Ruth
this paper, we first review the semi-classical approach to the radiation reaction and then extend our calculation to obtain a unified expression of the radiation damping rate covering both limits and...
Radiation Damping in Focusing-Dominated Systems (1995)
Zhirong Huang, Pisin Chen, Ronald D. Ruth
A quasi-classical method is developed to calculate the radiation damping of a relativistic particle in a straight, continuous focusing system. In one limiting case where the pitch angle of the...
Radiation Damping In Focusing-Dominated Systems (1995)
Zhirong Huang Pisin, Zhirong Huang, Pisin Chen, Ronald D. Ruth
A quasi-classical method is developed to calculate the radiation damping of a relativistic particle in a straight, continuous focusing system. In one limiting case where the pitch angle of the...
Channeling Acceleration: A Path To Ultrahigh Energy Colliders (1994)
Pisin Chen, Zhirong Huang, Ronald D. Ruth
Acceleration of charged particles along crystal channels has been proposed earlier in an attempt to achieve high acceleration gradient while at the same time to suppress excessive emittance growth....
Beam-Beam Phenomena In Linear Colliders (1990)
Kaoru Yokoya, Kaoru Yokoya, Pisin Chen, Pisin Chen
The beam-beam interaction in electron-positron linear colliders shows very different aspects from that in storage rings. The single-pass nature of the linear colliders allows drastic deformation of...