Noninteracting classical spins coupled to a heat bath of one-dimensional classical harmonic oscillators: Exact bath variable average

2013 ◽  
Vol 63 (10) ◽  
pp. 1892-1900
Author(s):  
Suhk Kun Oh
1976 ◽  
Vol 54 (20) ◽  
pp. 2067-2073 ◽  
Author(s):  
E. G. Lukac

The study of the shape of the nuclear strength function is a line spreading problem in which one examines how a residual interaction spreads a model state into the actual states of a system. In previous studies of the strength function the matrix elements of the residual interaction have been treated as the elements of a random matrix whose connection with the underlying physics was rather tenuous. Here a model consisting of one-dimensional harmonic oscillators, which has a more visualizable correspondence than random matrixes to a microscopic picture of nuclear reactions, is employed. In this model it is shown that the strength function is not Lorentzian and how it differs from a Lorentzian. The calculations suggest that preferential population of certain types of states can be expected in nuclear reactions. Attention is also drawn to the importance for heavy ion reactions of cluster states in the compound nucleus.


2021 ◽  
Vol 3 (6) ◽  
pp. 66-75
Author(s):  
Ioannis Haranas ◽  
Ioannis Gkigkitzis ◽  
Kristin Cobbett ◽  
Ryan Gauthier

According to Landauer’s principle, the energy of a particle may be used to record or erase N number of information bits within the thermal bath. The maximum number of information N recorded by the particle in the heat bath is found to be inversely proportional to its temperature T. If at least one bit of information is transferred from the particle to the medium, then the particle might exchange information with the medium. Therefore for at least one bit of information, the limiting mass that can carry or transform information assuming a temperature T= 2.73 K is equal to m = 4.718´10-40 kg which is many orders of magnitude smaller that the masse of most of today’s elementary particles. Next, using the corresponding temperature of a graviton relic and assuming at least one bit of information the corresponding graviton mass is calculated and from that, a relation for the number of information N carried by a graviton as a function of the graviton mass mgr is derived. Furthermore, the range of information number contained in a graviton is also calculated for the given range of graviton mass as given by Nieto and Goldhaber, from which we find that the range of the graviton is inversely proportional to the information number N. Finally, treating the gravitons as harmonic oscillators in an enclosure of size R we derive the range of a graviton as a function of the cosmological parameters in the present era.


1998 ◽  
Vol 35 (2) ◽  
pp. 255-271 ◽  
Author(s):  
Alain Comtet ◽  
Cécile Monthus ◽  
Marc Yor

The paper deals with exponential functionals of the linear Brownian motion which arise in different contexts, such as continuous time finance models and one-dimensional disordered models. We study some properties of these exponential functionals in relation with the problem of a particle coupled to a heat bath in a Wiener potential. Explicit expressions for the distribution of the free energy are presented.


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