Binayak Dutta-Roy

On the possibility of ‘Bose condensation’ in the excitation of coherent modes in biological systems

Abstract The phenomenon of Bose-Einstein condensation of phonons in biological structure, predicted by Frohlich on the basis of rate equations, is approached here from a microscopic point of view. Rough estimates are compared with the recent experimental evidence of the action of coherent millimeter electromagnetic radiation on biological systems.

A microscopic approach to the Fröhlich model of Bose condensation of phonons in biological systems

Abstract Considering non-quadratic interactions a microscopic approach is developed to demonstrate the possibility of Bose condensation of phonons in biological structures predicted by Frohlich on the basis of rate equations. Our treatment focusses attention on the essential parameters of the system necessary in providing a quantitative footing to the “Frohlich model”.

PHOTONS FROM HADRONIC MATTER AT FINITE TEMPERATURE

Abstract Temperature dependence of hadronic decay widths and masses are studied within the framework of an effective Lagrangian approach. At finite temperature the hadronic masses do not seem to follow a universal scaling law. Considering an exhaustive set of hadronic reactions and vector meson decays we have estimated the photon spectrum emitted from hot hadronic matter taking into account medium effects through thermal loop corrections on the hadronic decay widths and masses. An enhancement in photon emission rate is obtained when we use the in-medium masses of vector mesons in our calculations. It is observed that the effect of p decay width on the photon spectra is negligible.

Polar modes with elastic restoring forces, “bose condensation” and the possibility of a metastable “ferroelectric” state

Abstract The system consists of an electric polarisation field coupled on the one hand to an elastic field and on the other to a thermal reservoir. When the polarisation modes are pumped, Bose condensation in the lowest mode occurs, for energy inflow above a certain critical amount. It is shown that elastic forces, called into play to stabilise the excitation of the polar modes, lowers the threshold for Bose condensation. With further increase in the pumping rate the possibility exists for the softening of the polarisation oscillations leading, in the presence of quartic self-interaction of the polarisation field (inserted for stability), to a metastable ferroelectric state. The work represents an attempt to develop a microscopic approach to the Frohlich model for the dynamics of macromolecules (such as proteins and enzymes) of biological significance.

A critical assessment of the bubble model for positronium annihilation in liquids

The bubble model conventionally used to fit the observed characteristics of the pick-off component of ortho-positronium decay in liquids is subjected, in the present study, to a critical assessment. It is demonstrated that in its usual form (namely that of a bubble with a sharp boundary) the model is untenable, when confronted conjointly with experimental data on the lifetime and angular correlation of the decay gammas. A modified version of the model that is relatively free from such shortcomings is presented.

A modified bubble model for positronium atoms in liquids

Positronium self-trapping in liquids is frequently described through the bubble model in order to account for the observed decay characteristics, namely, the enhanced pick-off lifetime and the details of the angular correlation of the decay gammas. This model is improved upon in the present paper by modifying the idealised picture of a sharp bubble radius and thereby a formalism is developed which is not only more realistic but also provides elegant analytic solutions.

The possible role of solitonic processes during A to B conformational changes in DNA

Among the conformations which the DNA molecule can adopt, the transition beween the A and B families, controlled by water content (relative humidity), seems to be implicated in the transcription process. Focusing on the main structural difference involved (tilting of base normals with respect to the helix axis), a model is constructed, solitary wave solutions of the resulting equation of motion are demonstrated and possible experimental implications indicated.

Matter induced ϱ - ω mixing

Abstract A novel mechanism for ϱ - ω mixing induced by neutron-proton asymmetry in nuclear matter is uncovered and the variation of the mixing angle with the extent of asymmetry is presented.A novel mechanism for

Unstable particles in matter at a finite temperature: The ρ and ω mesons

\rho-\omega

Modification of the bubble model for positronium atoms in high surface tension liquids

mixing induced by neutron-proton asymmetry in nuclear matter is uncovered and the variation of the mixing angle with the extent of asymmetry is presented.