arXiv subjects

Anastasios Psinas

Publications and source records attributed to Anastasios Psinas.

6 recordsLinked to original sources

arXiv2007

Absorption Cross Section of Smeared D3-Brane on a Circle

The evaluation of the absorption cross section of a massless scalar field propagating on a non-extremal black D3-brane smeared on a circle is considered. The solution to the scalar field equation of motion at high temperature is obtained in terms of the parameters $λ=3ω/4πT$ and $k$, which denote the frequency and the momentum along the circle respectively while $T$ denotes the temperature of the black brane. Based on a perturbative scheme, higher order temperature corrections to the scalar absorption cross section are computed. Further, interesting analogies with the cross section of known black branes solutions are discussed.

hep-th↗

arXiv2006

Quantum Cosmology Aspects Of D3 Branes and Tachyon Dynamics

We investigate aspects of quantum cosmology in relation to string cosmology systems that are described in terms of the Dirac-Born-Infeld action. Using the Silverstein-Tong model, we analyze the Wheeler-DeWitt equation for the rolling scalar and gravity as well for $R\times{S^3}$ universe, by obtaining the wave functions for all dynamical degrees of freedom of the system. We show, that in some cases one can construct a time dependent version of the Wheeler-DeWitt (WDW) equation for the moduli field $ϕ$. We also explore in detail the minisuperspace description of the rolling tachyon when non-minimal gravity tachyon couplings are inserted into the tachyon action.

hep-th↗

arXiv2006

Mirage Cosmology on Unstable D3-Brane Universe

We study the geodesic motion of an unstable brane moving in a higher dimensional bulk spacetime. The tachyon which is coupled to a U(1) gauge field induces a non-trivial cosmological evolution. Interestingly enough, this system exhibits a much smoother initial cosmological singularity in comparison with former works.

hep-th↗

arXiv2006

Mirage Cosmology of U(1) Gauge Field on Unstable D3 Brane Universe

An unstable $D3$-brane universe governed by the DBI action of the tachyon field minimally coupled to a U(1) gauge boson is examined. The cosmological evolution of this coupled system, is further analyzed, in terms of the expansion rate of the inflating brane, which is highly affected by the presence of the tachyonic and gauge field charges. We show, that the minimal coupling makes the effective brane density less divergent. However, for some sectors of the theory the tachyon is not able to regulate it in an efficient fashion. Also, a detailed analysis of the dependance of the effective brane density on the scale factor of the universe is performed, which leads to various cosmological models.

hep-th↗

arXiv2004

Effective Lagrangian for Charged Higgs Couplings

The effective Lagrangian including one loop corrections is deduced for the couplings of the charged Higgs with quarks and leptons, and with charginos and neutralinos. The effect of the one loop corrections is found to be quite significant in a number of sectors. The effective Lagrangian is then used to analyze the decay of the charged Higgs into a number of decay channels. Specifically we consider the decay of $H^+(H^-)$ into the decay modes $t\bar b$ ($\bar t b$), $\barτν_τ$ ($τ\bar ν_τ$), and $χ_i^+χ_j^0(χ_i^-χ_j^0)$ (i=1,2; j=1-4). The loop corrections to these decay modes are also found to be quite significant lying in the range 20-30% in significant regions of the parameter space of the SUGRA model. The effects of CP phases on the effective Lagrangian and on the branching ratios are also analysed and these effects found to be important.

hep-ph↗

arXiv2004

Effective Lagrangian for $χ^+_iχ_j^0H^-$ Interaction in the MSSM and Charged Higgs Decays

We extend previous analyses of the supersymmetric loop correction to the charged Higgs couplings to include the coupling $H^{\pm}χ^{\mp}χ^0$. The analysis completes the previous analyses where similar corrections were computed for $H^+\bar t b$ ($H^-t\bar b$), and for $H^+τ^- \barν_τ$ ($H^- τ^+ ν_τ$) couplings within the minimal supersymmetric standard model. The effective one loop Lagrangian is then applied to the computation of the charged Higgs decays. The sizes of the supersymmetric loop correction on branching ratios of the charged Higgs $H^+(H^-)$ into the decay modes $t\bar b$ ($\bar t b$), $\barτν_τ$ ($τ\bar ν_τ$), and $χ_i^+χ_j^0(χ_i^-χ_j^0)$ (i=1,2; j=1-4) are investigated and the supersymmetric loop correction is found to be significant, i.e., in the range 20-30% in significant regions of the parameter space. The loop correction to the decay mode $χ_1^{\pm}χ_2^0$ is examined in specific detail as this decay mode leads to a trileptonic signal. The effects of CP phases on the branching ratio are also investigated. A brief discussion of the implications of the analysis for collders is given.

hep-ph↗