Professor of Physics
Professor Ruppeiner’s research has focused on using curved space geometry to represent physical situations in which many atoms cooperate to produce a few independent average properties, i.e., thermodynamics. Although the laws of thermodynamics make no reference to atoms, thermodynamics nevertheless yields information about microscopic properties. The curved space geometry is very revealing in this connection.
As an example, Professor Ruppeiner has applied these ideas to black holes, where the thermodynamics is well-known (due to Stephen Hawking and others), but the properties of the “atoms” is unknown. Professor Ruppeiner has also published in the areas of the large-scale arrangement of galaxies, computer approaches to "intractable" problems, theory of fluids, and using electric currents to probe the Earth.
“Thermodynamic R-diagrams reveal solid-like fluid states,” G. Ruppeiner, P. Mausbach, and H.-O. May, Phys. Lett. A 379, 646 (2015).
“Thermodynamic curvature for a two-parameter spin model with frustration,” G. Ruppeiner and S. Bellucci, Phys. Rev. E 91, 012116 (2015).
“Thermodynamic curvature and black holes,” G. Ruppeiner, “Breaking of Supersymmetry and Ultraviolet Divergences in Extended Supergravity,” Springer Proceedings in Physics 153, 179-203 (2014).
“Unitary thermodynamics from thermodynamic geometry,” G. Ruppeiner, Journal of Low Temperature Physics 174, 13-34 (2014). The abstract was featured on the website Advances in Engineering (http://advanceseng.com) April 28, 2014.
“Thermodynamic curvature for attractive and repulsive intermolecular forces,” H.-O. May, P. Mausbach, and G. Ruppeiner, Phys. Rev. E 88, 032123 (2013).
“Thermodynamic curvature: pure fluids to black holes,” G. Ruppeiner, J. Phys.: Conf. Series 410, 012138 (2013). arXiv:1210.2011.
“Thermodynamic Geometry, Phase Transitions, and the Widom Line,” G. Ruppeiner, A. Sahay, T. Sarkar, and G. Sengupta, Phys. Rev. E 86, 052103 (2012). arXiv:1106.2270v2 (2011).
“Thermodynamic curvature from the critical point to the triple point,” G. Ruppeiner, Phys. Rev. E 86, 021130 (2012). arXiv:1208.3265 (2012).
“Thermodynamic curvature measures interactions,” G. Ruppeiner, Am. J. Phys. 78, 1170 (2010). arXiv:1007.2160 (2010).
“Thermodynamic curvature and phase transitions in Kerr-Newman black holes,” G. Ruppeiner, Phys. Rev. D 78, 024016 (2008). arXiv:0802.1326 (2008).
“Stability and fluctuations in black hole thermodynamics,” G. Ruppeiner, Phys. Rev. D 75, 024037 (2007).