User:Sedrakian/sandbox

{{Infobox scientist | name = David Sedrakian | image = DavidSedrakian.jpg | caption = | birth_name = David Mheri Sedrakian | birth_date = {{birth date|1938|12|9|mf=y}} {{marriage|Mary Louise Bell|1952|1956}} {{marriage|Gweneth Howarth|1960}} }}
 * birth_place = Yerevan, Armenia, USSR
 * fields = Theoretical physics
 * workplaces = Yerevan State University
 * alma_mater = Lebedev Physical Institute of the Russian Academy of Sciences (FIAN),
 * thesis_year = 1964
 * doctoral_advisor = Boris Mikhaylovich Bolotovsky
 * academic_advisors = Vitali Lazaervich Ginzburg
 * known_for = {{collapsible list
 * title = {{nbsp}}|
 * awards = {{Plainlist|
 * Albert Einstein Award (1954)
 * E. O. Lawrence Award (1962)
 * Nobel Prize in Physics (1965)
 * Foreign Member of the Royal Society (1965)
 * Oersted Medal (1972)
 * National Medal of Science (1979)}}
 * signature = Richard Feynman signature.svg
 * spouse = {{marriage|Arline Greenbaum|1941|1945|end=died}}
 * children = 2

{{Infobox scientist| {{smaller|2019{{nbsp|2}}}}First Degree Medal for the Services Rendered to Fatherland }} David M. Sedrakian is a prominent Armenian theoretical physicist, professor at Yerevan State University and a full member of Academy of Sciences of Armenia (vice President of this academy in the years 1990-1994). He is a prolific researcher with more than 250 publications in a number of areas of theoretical physics, including astrophysics of compact stars, general relativity, particle radiation phenomena, nano-physics, superfluidity and superconductivity. Among his outstanding results is the development of a method for computing the properties of slowly rotating neutron stars in general relativity, the discovery of the entrainment effect in charge-neutral mixtures and generation of non-quantized flux of vortices in such mixtures, development of theories of pulsar radiation and pulsar glitches.
 * name = David M. Sedrakian
 * image = DavidSedrakian1.png
 * alt = David Sedrakian
 * caption =
 * birth_date = {{birth date|1938|12|9|mf=y}}
 * birth_place = Yerevan, Armenia
 * residence = {{ublist |Yerevan |Armenia}}
 * nationality = Armenian
 * fields = Physics (theoretical)
 * workplaces = {{ublist |YSU |National Academy of Sciences of Armenia}}
 * alma_mater = {{ublist |Lebedev Institute, of the Russian Academy of Sciences (FIAN) }}
 * doctoral_advisor = Boris Mikhaylovich Bolotovsky
 * known_for = {{longitem|Seminal contributions to physics of neutron stars, superfluidity, superconductivity, general relativity, nano-physics}}
 * awards = {{smaller|2009{{nbsp|2}}}}Medal of Anania Shirakatsi

Scientific life and career
David Mheri Sedrakian was born on December 9, 1938 in Yerevan. His father Mher Rubeni Sedrakian was a lawyer and his mother Arevhat Samsoni Manoukian was a mathematics school teacher. He graduated from the physics department of Yerevan State University (YSU) in 1961 with a gold medal. He was then directred to the Lebedev Physical Institute of the Russian Academy of Sciences (FIAN) for graduate studies in the group led by Vitali Lazaervich Ginzburg, where he worked under direct supervision of Boris Mikhaylovich Bolotovsky. In 1964 Sedrakian was awarded a Ph. D. for his thesis on "Diffraction radiation of charge point particles" defended at FIAN. After returning to Yerevan State University he stated his work at the chair of theoretical physics, where he developed in collaboration with Edward Chubaryan a method for computing general relativistic structure of slowly rotating neutron stars. For this work he was awarded in 1972 a doctorate of physical-mathematical sciences. In 1975 he was awarded a professorship at the chair of theoretical physics. In the periods 1974-1986 and 1994-2018 Sedrakian was the head of the chair of general physics at YSU. He was elected a Corresponding Member of the Academy of Sciences of Armenian SSR in 1982 and a Full Member in 1990. In the period 1986-1994 he worked in the Presidium of Academy of Sciences, first as the academician-secretary (1986-1990) and then as the vice-president (1990-1994). He was also the president of the Council of Theoretical Physics and Astrophysics of RA National Academy of Sciences, a number of scientific councils, including the scientific council and professional council of the Byurakan Astrophysical Observatory. Since 2000 he is the Editor-in-Chief of the well-known Soviet and Armenian astrophysics journal "Astrophysics”.

David Sedrakian has been a long-term visitor at a number of foreign institutions including University of Cambridge (Magdalene college) in the academic year 1969, Cornell University (1987,1994,1998), Observatoire de Paris-Meudon (1997-2002) and Iinstitut d'astrophysique de Paris (2003-2012).

Key scientific results
David Sedrakian is prolific theoretical physics with over 250 publications in international journals. He has worked on a wide number of topics, which include the theory of diffraction radiation, general relativity, physics of neutron stars and pulsars, superfluidity and superconductivity, hydrodynamics and magnetohydrodynamics, and nano-physics.

His first research area was the diffraction radiation of charged particles - the theme of his Ph.D. thesis which was conducted at the Lebedev Physical Institute (then FIAN) in Moscow. After returning to the YSU, Sedrakian changed the direction of research and started working on the physics of compact astrophysical objects within the group of Prof. Gurgen Sahakian. In collaboration with Edward Chubaryan he developed a method for computing the properties of slowly rotating neutron stars. In doing so they found one of a few solutions of Einstein’s equations describing the axialsymmetric self-gravitating bodies in vacuum. On its basis of the method the theory of rotating celestial bodies was developed, in particular the physical characteristics of polytropic stellar models, white dwarf and baryonic stars were computed. After the discovery of pulsars by Bell and Hewish, Sedrakian worked on the theories of generation of magnetic fields in pulsars. He developed a theoretical mechanism based on superfluid properties of neutrons and protons, in particular the entrainment effect. He further investigated the energetic output due to the vortex dynamics in neutron stars and developed a mechanism of radio-emission of pulsars which originates in the stars interior. One of the widely known effects first explored by Sedrakian and co-workers is the generation of non-quantized flux on vortex lines in a neutral superfluid when this is embedded in a superconductor. The flux is generated by entrainment currents due to the entrainment effect first studied in the uncharged superfluid mixtures by Andreev and Bashkin. The entrainment effect in neutron star cores, as first formulated by Sedrakian and co-workers, is now a standard element of the description of physics of these objects.

Another aspect of Sedrakian's research is the relativistic (magneto) hydrodynamics. In collaboration with Prof. Brandon Carter and David Langlois, he developed a version of relativistic hydrodynamics applicable to neutron stars and their non-stationary dynamics. These theories were applied to the explanation of glitches in pulsars and other phenomena, such as relaxation of flux motion in superconductors.

During the last two decades Sedrakian and co-workers developed quantum-mechanical methods for solving the quantum mechanical transmission and reflection problem in low-dimensional systems. These included the propagation of particles (electrons) and light (laser) in random potentials in one and two dimensions. The method allows one to effectively solve the many-body Schrödinger equation by integration of differential equations with specified initial conditions. The method is useful in problems arising in nano-physics.

Awards
David Sedrakian was a prize winner of Komsomol Union of Armenia (1970), was awarded Medal of Anania Shirakatsi of Republic of Armenia for significant activities, inventions and discoveries in the science (2009) and First Degree Medal for the Services Rendered to Fatherland (2019). He is a member of International Astronomical Union, Armenian Physical Society and Armenian Astronomical Society (2009), a number of other scientific organizations.

Category:20th-century scientists Category:Theoretical physicists Category:Textbook writers