%0 Journal Article %1 baldassarri:911 %A Baldassarri, A. %A Puglisi, A. %A Vulpiani, A. %D 2008 %E Co, Albert %E Leal, Gary L. %E Colby, Ralph H. %E Giacomin, A. Jeffrey %I AIP %J THE XV INTERNATIONAL CONGRESS ON RHEOLOGY: The Society of Rheology 80th Annual Meeting %K 2008 california conference fdt granular monterey myown physics proceeding %N 1 %P 911-913 %R 10.1063/1.2964891 %T Fluctuations and Response in Granular Gases: Validity and Failure of Einstein Relation. %U http://link.aip.org/link/?APC/1027/911/1 %V 1027 %X The linear response in different models of driven granular gases is studied. In some situations, even if the the velocity statistics can be strongly non-Gaussian, appreciable violations of the Einstein formula for diffusion versus mobility cannot be observed. The situation changes when correlations between different degrees of freedom are present: in this case, although a form of fluctuation-dissipation relation holds, the differential velocity response of a particle and its velocity self-correlation are no more proportional. This happens at high densities, strong inelasticities, or weak efficiency of the external driving, but still in the fluid-like (and ergodic) regime.

@article{baldassarri:911, abstract = {The linear response in different models of driven granular gases is studied. In some situations, even if the the velocity statistics can be strongly non-Gaussian, appreciable violations of the Einstein formula for diffusion versus mobility cannot be observed. The situation changes when correlations between different degrees of freedom are present: in this case, although a form of fluctuation-dissipation relation holds, the differential velocity response of a particle and its velocity self-correlation are no more proportional. This happens at high densities, strong inelasticities, or weak efficiency of the external driving, but still in the fluid-like (and ergodic) regime.}, added-at = {2009-03-16T12:27:43.000+0100}, author = {Baldassarri, A. and Puglisi, A. and Vulpiani, A.}, biburl = {https://www.bibsonomy.org/bibtex/259dbd7169ba211c5884aa65c6e897546/andreab}, doi = {10.1063/1.2964891}, editor = {Co, Albert and Leal, Gary L. and Colby, Ralph H. and Giacomin, A. Jeffrey}, interhash = {4abe34759a4ffe544b9ea8b027cab99e}, intrahash = {59dbd7169ba211c5884aa65c6e897546}, journal = {THE XV INTERNATIONAL CONGRESS ON RHEOLOGY: The Society of Rheology 80th Annual Meeting}, keywords = {2008 california conference fdt granular monterey myown physics proceeding}, location = {Monterey (California)}, number = 1, pages = {911-913}, publisher = {AIP}, timestamp = {2009-03-16T12:27:43.000+0100}, title = {Fluctuations and Response in Granular Gases: Validity and Failure of Einstein Relation.}, url = {http://link.aip.org/link/?APC/1027/911/1}, volume = 1027, year = 2008 }