# Christian Corda

Christian Corda received his Ph.D. degree in physics from the Pisa University, Pisa, Italy in 2008. He is the Editor-in-Chief of the international journals “Journal of High Energy Physics, Gravitation and Cosmology” and “Theoretical Physics”. He is also Editorial Board Member and Associate Editor of other six international peer-reviewed journals. He served as Guest Editor for Advanced in High Energy Physics in the two Special Issues “Black Hole physics” and "Classical and Quantum Gravity and Its Applications". In addition, Dr. Corda is habilitated as Full Professor of Theoretical Physics in the USA and Associated Professor of Theoretical Physics and Astrophysics at the Italian Department for University, Research and Education (MIUR). Dr. Corda's Essay "Interferometric detection of gravitational waves: the definitive test for General Relativity" was an an Honorable Mention Winner at the 2009 Gravity Research Foundation Awards. In his paper "Effective temperature for black holes", published in JHEP08(2011)101, Dr. Corda found an interesting result in the framework of quantum physics of black holes (BHs), by introducing a Bh effective temperature which takes into account the fact that, as shown by Parikh and Wilczek, the radiation spectrum cannot be strictly thermal. The analysis permits to find, for the first time in the literature, a direct connection between the Bekenstein-Hawking entropy, his sub-leading corrections and a quantum number. From this research paper Dr. Corda realized an Essay which received a second Honorable Mention in the 2012 Essay Competition of the Gravity Research Foundation. After this, Dr. Corda further improved his work on BHs showing that quantum BH are somewhat similar to the historical semi-classical model of the structure of a hydrogen atom introduced by Bohr in 1913. In the “Bohr-like BH model”, in a certain sense, the BH quasi-normal modes "triggered" by Hawking quanta represent the "electron" which jumps from a level to another one and the absolute values of the quasi-normal frequencies represent the energy "shells". In Bohr model electrons can only gain and lose energy by jumping from one allowed energy shell to another, absorbing or emitting radiation with an energy difference of the levels according to the Planck relation E=hf, where h is the Planck constant and f the transition frequency. In the Bohr-like BH model, quasi-normal modes can only gain and lose energy by jumping from one allowed energy shell to another, absorbing or emitting radiation (emitted radiation is given by Hawking quanta) with an energy difference of the levels according to eq. (30) of Dr. Corda's paper Int. Journ. Mod. Phys. D 21, 1242023 (2012). The similarity is completed if one notes that the interpretation of a quasi-normal mode is of a particle, the "electron", quantized on a circle of length inversely proportional to the introduced effective temperature. The Bohr-like BH model is in perfect agreement with existing results in the literature, starting from the famous result of Bekenstein on the area quantization. The model has also important implications on the BH information paradox and on the non-strictly random character of Hawking radiation. In fact, in Dr. Corda's paper Ann. Phys. 353, 71 (2015) it has been shown that the time evolution of the model is governed by a time-dependent Schrodinger equation for the system composed by Hawking radiation and black hole quasi-normal modes. The physical state and the correspondent wave function are written in terms of an unitary evolution matrix instead of a density matrix. Thus, the final state results to be a pure quantum state instead of a mixed one while emitted energies result entangled with BH quasi-normal modes. The time evolution of the model, in turn, represents a new, independent solution to the famous BH information paradox, enunciated by Stephen Hawking in 1976. The Bohr-like BH model has been developed by Dr. Corda in various different papers published in various specialist ISI journals like Classical and Quantum Gravity, Annals of Physics, Advanced in High Energy Physics, European Journal of Physics C and International Journal of Theoretical Physics. In October 2013 Dr. Corda has been awarded with a Certificate of Honour by the Nagpur University in recognition and grateful appreciation for his research contributions in the fields of black holes and gravitational waves. In September 2014, at the 12th International Conference of Numerical Analysis and Applied Mathematics, Dr. Corda has been awarded by the European Society of Computational Methods in Sciences, Engineering and Technology with its Highest Distinction of Honorary Fellowship for his outstanding results in Applied Mathematics. In 2015, through a correct physical interpretation of Mössbauer experiment in a rotating system, Dr. Corda found a new proof of Einstein's General Theory of Relativity published in Ann. Phys. Ann. Phys. 355, 360 (2015). He is author and/or co.author of more that 100 scientific papers published in international peer reviewed specialist journals in the fields of mathematics, theoretical physics, astrophysics and cosmology. His h index is 31 and his i10-index is 78, for a total number of 4789 citations.