Sedrakyan, David Mgerovich

David Mgerovich Sedrakyan
David Mgerovich Sedrakyan
	arm Դավիթ Մհերի Սեդրակյան
Date of Birth	December 9, 1938 (aged 80)
Place of Birth	Yerevan , Armenian SSR , USSR
A country	; ;
Scientific field	theoretical physics
Place of work	YSU , NAS RA
Alma mater	Yerevan State University
Academic degree	Doctor of physico-mathematical sciences (1972)
Academic rank	professor (1975), ; Academician of the Academy of Sciences of the Armenian SSR (1990) , ; Academician of NAS RA (1991)

David M. Sedrakyan ( Armenian Դավիթ Մհերի Սեդրակյան ; born December 9, 1938, Yerevan ) is an Armenian theoretical physicist and astrophysicist .

Academician of the Academy of Sciences of the Armenian SSR (1990, corresponding member since 1982), doctor of physical and mathematical sciences (1972), professor (1975).

David Mgerovich Sedrakyan - Head of the Department of General Physics of Yerevan State University (1977-1986, 1994-2013, since 2013 - Honorary Head), Academic Secretary of the Academy of Sciences of the Armenian SSR (1986-1990), Vice President of the NAS of RA (1990-1994). The main studies relate to the physics of neutron stars , the theory of radio emission of pulsars , low-temperature physics , and the theory of gravity ^[1] .

Content

1 Biography
2 Scientific activities
3 Awards
4 notes
5 Literature
6 References

Biography

David Mgerovich Sedrakyan was born on December 9, 1938 in Yerevan ^[2] .

In 1955 he graduated from Yerevan secondary school No. 4 with a gold medal ^[3] . In the same year he entered and in 1961 graduated with honors from the Physics Department of Yerevan State University ^[3] .

In 1962 he entered the graduate school of the theoretical department of the P. N. Lebedev Physical Institute of the Academy of Sciences of the USSR ^[2] . In 1964, under the guidance of Professor Boris Bolotovsky ^[4] , he defended his thesis for the degree of candidate of physical and mathematical sciences on the subject “Diffraction radiation of a point charged particle” ^[5] .

Since 1964 he has been working at Yerevan State University: in 1964-1967 he was an assistant in the Department of Theoretical Physics, in 1967-1975 - an assistant professor , since 1975 - a professor ^[2] .

In 1972, at Yerevan State University, he defended his thesis for the degree of Doctor of Physics and Mathematics ^[1] on the topic “Theory of Rotating Celestial Bodies” ^[6] . In 1977 he joined the CPSU ^[7] .

In 1982, he was elected a corresponding member of the Academy of Sciences of the Armenian SSR ^[8] . In 1977-1986 he was the head of the Department of General Physics of Yerevan State University. In 1986-1990, he served as academician-secretary of the Academy of Sciences of the Armenian SSR ^[2] .

In 1990, he was elected an academician of the Academy of Sciences of the Armenian SSR ^[8] . In 1990-1994, he served as vice president of the Academy of Sciences of the Armenian SSR (NAS RA). In 1994-2013 he was again the head of the Department of General Physics of Yerevan State University (since 2008 - the Department of General Physics and Astrophysics named after Academician V. A. Hambartsumyan ) ^[2] , since 2013 - the Honorary Head of the Department ^[1] . He is also a professor at the Department of General Physics and Quantum Nanostructures of the Russian-Armenian Slavic University ^[9] .

David Mgerovich Sedrakyan was a visiting specialist at Cambridge , Cornell , and Rome Universities ^[2] , a participant in many international scientific conferences on theoretical physics ^[10] . For a long time he was the editor-in-chief of the journal Izvestia AN SSSR. From 2000 to 2017, he was the chief editor of the Astrophysics journal of the NAS RA ^[11] ^[12] . Sedrakyan is a member of the International Astronomical Union since 2001 ^[2] .

Scientific activity

The main works of David Mgerovich Sedrakyan relate to theoretical physics and theoretical astrophysics ^[8] .

David Sedrakyan (together with academician Edward Chubaryan ) constructed the theory of rotation of stellar configurations, which are described by a one-parameter equation of state in the framework of the Newton and Einstein theories. The theory served as the basis for proposing a new methodology for calculating the parameters of rotational configurations, which was used to calculate new models of rotating celestial bodies ^[13] . He received one of the few solutions of the Einstein equations of the attractive field - a solution with axial symmetry in vacuum . This theory confirmed that the pulsars discovered by Anthony Hewish are spinning neutron stars ^[5] .

Among the scientific interests of Sedrakyan is the study of physical phenomena inside neutron stars . He proposed a new radio emission mechanism for pulsars . According to Sedrakyan, radiation is formed between the core and the shell of the pulsar, and propagates in the form of a magneto-acoustic wave to the surface, and currents excited by the wave are a source of radio emission ^[13] . Sedrakyan proposed a theoretical mechanism for the appearance of superpower magnetic fields in pulsars , based on the superfluidity of neutrons and protons ^[5] . He also investigated the observed deceleration of the rotational motion of the pulsars, proposed a mechanism of inhibition of the rotational motion, which is accompanied by jumps in the angular velocity of the pulsars (glych) ^[13] .

Sedrakyan obtained results in a study of the theory of rotating superconductors and superfluid liquids , quark stars with a superconducting core. He is engaged in research devoted to calculating the energy spectrum of an electron , transmission and reflection coefficients of electrons, and studying the localization of electrons ^[13] .

David Sedrakyan is the author of more than 250 scientific articles in Armenian and foreign publications ^[13] ^[14] ^[15] ^[16] , university textbooks “Thermodynamics and Statistical Physics” (Yerevan, 1979) and “Electricity and Magnetism” (Yerevan, 2010) ^[17] .

Books

Sedrakyan D.M. Thermodynamics and statistical physics = Թերմոդինամիկա և վիճակագրական ֆիզիկա / G. S. Sahakyan . - Er. : Yerevan University Press , 1979.- 176 p.
Sedrakyan D. M., Badalyan D. A. Thermodynamics and statistical physics = Թերմոդինամիկա և վիճակագրական ֆիզիկա. - Er. : Edith Print, 2012.
Sedrakyan D. M., Papoyan A. A. Electricity and magnetism = Էլեկտրականություն և մագնիսականություն. - Er. : “Edith Print”, 2010. - 330 p.

Key Scientific Articles

Papoyan V.V., Sedrakyan D.M., Chubaryan E.V. On the nonrelativistic theory of rotating configurations // Astrophysics. - 1967. - T. 3 , No. 1 . - S. 41-54 .
Sedrakyan D.M., Chubaryan E.V. Stationary axially-symmetric gravitational fields // Astrophysics. - 1968. - T. 4 , No. 2 . - S. 239-256 .
Sedrakyan D.M. Magnetic field of rotating neutron stars // Astrophysics. - 1970. - T. 6 , No. 4 . - S. 615-624 .
Sahakyan G.S. , Sedrakyan D.M., Chubaryan E.V. On the theory of white dwarfs // Astrophysics. - 1972. - T. 8 , No. 4 . - S. 541–556 .
Alojants G.P., Sedrakyan D.M., Chubaryan E.V. On the issue of possible condensation $\pi$ ${\ displaystyle \ pi}$ -mesons in nuclear matter // Astrophysics. - 1973. - T. 9 , No. 4 . - S. 581-588 .
Sedrakyan D. M., Mkrtchyan G. S., Shakhabasyan K. M. On the theory of rotating superconductors // Bulletin of the Academy of Sciences of the Armenian SSR. Physics. - 1976. - T. 11 , No. 5 . - S. 385-389 .
Sedrakyan D.M., Papoyan K.V. On sound propagation in a dielectric medium at low temperatures // Bulletin of the Academy of Sciences of the Armenian SSR. Physics. - 1977. - T. 12 , No. 5 . - S. 357-362 .
Sedrakyan D.M. Magnetic field of pulsars // Astrophysics. - 1982. - T. 18 , No. 3 . - S. 417-422 .
Sedrakyan D.M., Shahabasyan K.M., Movsisyan A.G. On the thermodynamics of superfluid solutions in the "npe" phase of a neutron star // Astrophysics. - 1983. - T. 19 , No. 2 . - S. 303-314 .
Abrahamyan M.G., Sedrakyan D.M. On angular momenta of galaxies // Astrophysics. - 1985. - T. 23 , No. 1 . - S. 35–46 .
Sedrakyan D.M., Avetisyan A.K. Plasma magnetohydrodynamics in the crust of a neutron star // Astrophysics. - 1987. - T. 26 , No. 3 . - S. 489-500 .
Sedrakyan D.M., Shahabasyan K.M. Superfluidity and magnetic field of pulsars // Uspekhi Fizicheskikh Nauk . - 1991. - T. 161 , No. 7 . - S. 3-40 .
Sedrakyan A.D., Sedrakyan D.M. Dynamics of rotating superfluid systems taking into account pinning // JETP . - 1995. - T. 108 , No. 2 .
Sedrakyan D.M., Badalyan D.A., Gasparyan V.M., Khachatryan A. Zh. Landauer resistance of a one-dimensional metal with periodically arranged random impurities // ZhETF . - 1997. - T. 111 , No. 2 . - S. 575-584 .
Sedrakyan D. M., Badalyan D. A., Khachatryan A. Zh. Localization of an electron on a one-dimensional chain of randomly spaced random $\delta$ ${\ displaystyle \ delta}$ potentials // Bulletin of the NAS of RA. Physics. - 1998. - T. 33 , No. 4 . - S. 166-175 .
Sedrakyan D. M., Khachatryan A. Zh. The method of complex scattering amplitude in quantum mechanics // Bulletin of the NAS of RA. Physics. - 2002. - T. 37 , No. 5 . - S. 282-292 .
Sedrakyan D.M. Phenomenological theory of phase transition in high-temperature superconductors // Bulletin of the NAS of RA. Physics. - 2005. - T. 40 , No. 2 . - S. 81-89 .
Sedrakyan D.M.Dynamic equations of quantum vortices in superconductors of the second kind // News of NAS RA. Physics. - 2006. - T. 41 , No. 5 . - S. 319-323 .
Sedrakyan D.M., Ghazaryan E.M. , Sedrakyan L.R. Immersion method for the multichannel scattering problem // Bulletin of the NAS of RA. Physics. - 2009. - T. 44 , No. 6 . - S. 395-404 .
Sedrakyan D.M. Transport matrix for the multichannel scattering problem // Bulletin of the NAS of RA. Physics. - 2010. - T. 45 , No. 3 . - S. 183-192 .
Sedrakyan D.M., Krikoryan R. Rotation of a superfluid liquid in the framework of general relativity // Astrophysics. - 2011. - T. 54 , No. 1 . - S. 139-148 .
Sedrakyan D. M., Petrosyan P. G., Grigoryan L. N. Influence of random potential on the optical properties of semiconductor $\mathrm {Cd} \mathrm {S} _{x}\mathrm {Se} _{1-x}$ ${\ displaystyle \ mathrm {Cd} \ mathrm {S} _ {x} \ mathrm {Se} _ {1-x}}$ nanocrystals // Journal of Technical Physics . - 2015 .-- T. 85 , no. 5 . - S. 94-99 .

Rewards

Medal "For Merit to the Fatherland" 1st degree (02.27.2019) ^[18] .
Medal of Anania Shirakatsi (1999) ^[19] .
Prize of the LKSM of Armenia (1970) - for the work “Stationary axially symmetric fields in Einstein's theory” ^[20] .
Gold medal of the National Academy of Sciences of RA (2015) ^[11] .

Notes

↑ ¹ ² ³ David Mgerovich Sedrakyan (in Armenian) . Yerevan State University . Date of treatment January 17, 2016.
↑ ¹ ² ³ ⁴ ⁵ ⁶ ⁷ Hayrapetyan, 2012 , p. 9.
↑ ¹ ² Hayrapetyan, 2012 , p. 21.
↑ Boris Bolotovsky. Memoirs of V.L. Ginzburg (Neopr.) . Seven Arts (October 2010). Date of treatment January 17, 2016.
↑ ¹ ² ³ Armen Martirosyan. Biography of David Sedrakyan (in Armenian) . Armenian Scientific Cooperation (April 18, 2011). Date of treatment January 17, 2016.
↑ Hayrapetyan, 2012 , p. 13.
↑ Armenian Soviet Encyclopedia, 1984 , p. 265.
↑ ¹ ² ³ David Mgerovich Sedrakyan (neopr.) . National Academy of Sciences of RA . Date of treatment January 17, 2016.
↑ Department of General Physics and Quantum Nanostructures (Neopr.) . Russian-Armenian (Slavic) University . Date of treatment January 17, 2016.
↑ Hayrapetyan, 2012 , p. 9-10.
↑ ¹ ² Science, 2015 , p. 3.
↑ Hayrapetyan, 2012 , p. 23.
↑ ¹ ² ³ ⁴ ⁵ Hayrapetyan, 2012 , p. 22.
↑ Articles by David Mgerovich Sedrakyan (neopr.) . Proceedings of the NAS RA. Physics. Date of treatment January 17, 2016.
↑ Articles by David Mgerovich Sedrakyan (neopr.) . Astrophysics. Date of treatment January 17, 2016.
↑ Articles by David Mgerovich Sedrakyan (neopr.) . Reports of NAS RA. Date of treatment January 18, 2016.
↑ Hayrapetyan, 2012 , p. 25.
↑ Decree of the President of the Republic of Armenia “On Awarding DM Sedrakyan with the Medal“ For Merit to the Fatherland, First Class ” (in Armenian) . President of the Republic of Armenia (February 27, 2019). Date of treatment March 6, 2019.
↑ Hayrapetyan, 2012 , p. 10.
↑ Hayrapetyan, 2012 , p. 19.

Literature

The 50th anniversary of the international journal "Astrophysics" (in Armenian) was celebrated at the National Academy of Sciences of Armenia = ՀՀ գիտությունների ազգային ակադեմիայում շուքով նշվեց "աաֆիզիկա" միջաիային հանդեմ մննդ մնադ դնադ դնադ դնադ դադդադադդադդադադդադանդդ. - 2015. - Հ. 286 , թիվ 9 . - Էջ 3 .
David Sedrakyan. Bibliography = Դավիթ Սեդրակյան. կենսամատենագիտություն / Comp. A. Hayrapetyan. - Er. : Yerevan University Press , 2012 .-- 147 p.
To the 70th anniversary of Academician D. M. Sedrakyan // Bulletin of the NAS of RA. Physics. - 2009. - T. 44 , No. 1 . - S. 73-74 .
To the 60th anniversary of Academician D. M. Sedrakyan // Bulletin of the NAS of RA. Physics. - 1999. - T. 34 , No. 1 . - S. 60–61 .
Sedrakyan David Mgerovich // Armenian Soviet Encyclopedia / V. A. Hambartsumyan . - Er. , 1984. - T. 10. - S. 265. - 736 p.

Links

Profile of David Mgerovich Sedrakyan on the official website of the NAS RA
Profile of David Mgerovich Sedrakyan on the website of Yerevan State University
Kananova N. There are more general academicians than graduate students // Voice of Armenia: socio-political newspaper. - 2014.
Davit Sedrakian (English) . Armenian Astronomical Society. Date of treatment January 17, 2016.

[ЕГУ-1] ¹ ² ³ David Mgerovich Sedrakyan (in Armenian) . Yerevan State University . Date of treatment January 17, 2016.

[_3781e94b7958fb8f-2] ¹ ² ³ ⁴ ⁵ ⁶ ⁷ Hayrapetyan, 2012 , p. 9.

[_aabaef3f3233617d-3] ¹ ² Hayrapetyan, 2012 , p. 21.

[болотовский-4] Boris Bolotovsky. Memoirs of V.L. Ginzburg (Neopr.) . Seven Arts (October 2010). Date of treatment January 17, 2016.

[armscoop-5] ¹ ² ³ Armen Martirosyan. Biography of David Sedrakyan (in Armenian) . Armenian Scientific Cooperation (April 18, 2011). Date of treatment January 17, 2016.

[_aabaf23f32336656-6] Hayrapetyan, 2012 , p. 13.

[_947277f3f896c6d7-7] Armenian Soviet Encyclopedia, 1984 , p. 265.

[НАН_РА-8] ¹ ² ³ David Mgerovich Sedrakyan (neopr.) . National Academy of Sciences of RA . Date of treatment January 17, 2016.

[РАУ-9] Department of General Physics and Quantum Nanostructures (Neopr.) . Russian-Armenian (Slavic) University . Date of treatment January 17, 2016.

[_8a8c97f204522528-10] Hayrapetyan, 2012 , p. 9-10.

[_f5fe55aabb23a3cb-11] ¹ ² Science, 2015 , p. 3.

[_aabaef3f3233617f-12] Hayrapetyan, 2012 , p. 23.

[_aabaef3f3233617e-13] ¹ ² ³ ⁴ ⁵ Hayrapetyan, 2012 , p. 22.

[изв-14] Articles by David Mgerovich Sedrakyan (neopr.) . Proceedings of the NAS RA. Physics. Date of treatment January 17, 2016.

[астрофизика-15] Articles by David Mgerovich Sedrakyan (neopr.) . Astrophysics. Date of treatment January 17, 2016.

[Доклады-16] Articles by David Mgerovich Sedrakyan (neopr.) . Reports of NAS RA. Date of treatment January 18, 2016.

[_aabaef3f32336179-17] Hayrapetyan, 2012 , p. 25.

[указ-18] Decree of the President of the Republic of Armenia “On Awarding DM Sedrakyan with the Medal“ For Merit to the Fatherland, First Class ” (in Armenian) . President of the Republic of Armenia (February 27, 2019). Date of treatment March 6, 2019.

[_aabaf23f32336655-19] Hayrapetyan, 2012 , p. 10.

[_aabaf23f3233665c-20] Hayrapetyan, 2012 , p. 19.