Alexey S. Koshelev
BioSketch 丨Research丨Publications 丨Team Members 丨Job Openings
 BioSketch 

Alexey S. Koshelev
Assistant professor, PI
ShanghaiTech University, School of Physical Science and Technology (SPST)
Fundamental Physics Theory group leader
email：askoshelev@shanghaitech.edu.cn
phone：+8621TBD
Academic appointments:
2023 – present – ShanghaiTech University, School of Physics Sciences and Technology
2017 – 2022 – FCT principal investigator (Assistant Professor), Departamento de Fı́sica and Centro de Matemática e Aplicacoes, Universidade da Beira Interior, Covilhã, Portugal.
2015 – 2016 – FCT BPD researcher, Departamento de Fı́sica and Centro de Matemática e Aplicacoes, Universidade da Beira Interior, Covilhã, Portugal.
2008 – 2014 – FWO postdoctoral fellow (initial and renewal terms), Theoretical Physics (TENA), Vrije Universiteit Brussel, Brussels, Belgium.
2007 – 2008 – postdoctoral researcher, Theoretical Physics (TENA), Vrije Universiteit Brussel, Brussels, Belgium.
2005 – 2007 – Marie Curie fellow, Incoming International Fellowship, Physics department, University of Crete, Heraklion, Greece.
2003 – 2007 – Scientific Researcher, Steklov Mathematical Institute of RAS, Moscow, Russia.
Education:
2003 – Ph.D. in Theoretical Physics, Steklov Mathematical Institute, Moscow, Russia. Advisor: Prof. Irina Ya. Aref’eva.
2000 – Master of Sciences in physics, Physics Department, Lomonosov Moscow State University, Russia. Advisor: Prof. Irina Ya. Aref’eva.
1998 – Bachelor of Sciences in physics, Physics department, Lomonosov Moscow State University, Russia. Advisor: Prof. Irina Ya. Aref’eva.
 Research 

My research spans quantization of gravity, cosmology, scattering amplitudes, string theory and string field theory, and black holes. The arXiv archives are: hepth, grqc and astroph.CO.
Quantum Gravity (QG) is the long standing problem for theoretical physicists which is under intensive consideration and severe scrutiny for more than a century. Among various proposals the idea by Stelle from 1977 is the most elegant move to construct a theory of quantum gravity. This approach gives a renormalizable theory but unfortunately fails to maintain unitarity due to the presence of the Weyl ghost. In my research I aim to overcome this problem and to come out with a selfconsistent QG theory by using ideas and inspirations of the string field theory, the second quantized description of strings.
Scattering amplitudes is the subject of study by many theoretical physicists worldwide. Models’ study through scattering amplitudes is highly motivated by its universality. The underlying idea is to use analyticity properties of the scattering amplitudes as well as various known bounds on their grows and decay in combination with the power of complex analysis. This sometimes surprisingly leads to very interesting and perhaps unexpected outcomes based on just desired or expected properties of the scattering amplitudes even without specifying the underlying theory. This is the topic of the projects under investigation by myself.
A comprehensive current list of publications can be found here:
https://inspirehep.net/authors/1034784?uicitationsummary=true
Below are several selected recent publications:
1. UV graviton scattering and positivity bounds from IR dispersion relations
M. HerreroValea (Barcelona, IFAE), A.S. Koshelev (Beira Interior U., Covilha), A. Tokareva (Imperial Coll., London),
Phys.Rev.D 106 (2022) 10, 105002, ePrint: 2205.13332 [hepth]
2. Nonlocal selfhealing of Higgs inflation,
Alexey S. Koshelev (UBI, Covilha), Anna Tokareva (Moscow, INR),
Phys.Rev.D 102 (2020), 123518, ePrint: 2006.06641 [hepth]
3. Analytic infinite derivative gravity, R^2like inflation, quantum gravity and CMB,
Alexey S. Koshelev (Beira Interior U., Covilha), K. Sravan Kumar (U. Groningen, VSI), Alexei A. Starobinsky (Landau ITP, Chernogolovka),
Int.J.Mod.Phys.D 29 (2020) 14, 2043018, ePrint: 2005.09550 [hepth]
4. R^2 inflation to probe nonperturbative quantum gravity,
Alexey S. Koshelev (Beira Interior U., Covilha and Intl. Solvay Inst., Brussels and Vrije U., Brussels), K. Sravan Kumar (Beira Interior U., Covilha), Alexei A. Starobinsky (Kazan State U. and Landau Inst.),
JHEP 03 (2018), 071, ePrint: 1711.08864 [hepth]
5. Occurrence of exact R^2 inflation in nonlocal UVcomplete gravity,
Alexey S. Koshelev (Beira Interior U., Covilha and Intl. Solvay Inst., Brussels and Vrije U., Brussels), Leonardo Modesto (Fudan U.), Leslaw Rachwal (Fudan U.), Alexei A. Starobinsky (Kazan State U. and Landau Inst.),
JHEP 11 (2016), 067, ePrint: 1604.03127 [hepth]
 Team Members 
 
Two postdoctoral researches: Oleg Melichev Abhishek Naskar 
 Job Openings 

Two postdoctoral researches Deadline on Feb 3, 2023 Job description: The Fundamental Physics Theory group of School of Physical Science and Technology of the ShanghaiTech University seeks to appoint 2 postdoctoral researchers in the team of Prof. Alexey Koshelev. Current research of the team encompasses Quantum Gravity, Cosmology, Black Holes, String Theory and Scattering amplitudes The priority will be given to candidates who primarily intent to work in the fields of the current team activity and closely related areas which include but not limited to string cosmology, holography, quantum information and others. Ideally the candidates will implement their independent research program. The appointment normally will last for two years and is expected to start in the Fall of 2023. The starting date is negotiable. ShanghaiTech University will provide competitive remuneration, allowances and benefits in accordance with the relevant regulations of the University and according to the experience of the candidates. A possibility of a thirdyear extension depends on the work performance. The perspective candidates should have a PhD degree in a relevant area of physics (or mathematics) prior to the start of the appointment. International postdoctoral experience is an asset. In accordance with the Chinese regulations a candidate should be under 35 years old. The following materials must be submitted for consideration before February 3, 2023: · Motivation letter · Curriculum Vitae containing the INSPIRE link to all the candidate’s publications · Research statement up to 3 pages · Three reference letters should be arranged by the applicant and submitted independently by letters’ writers. All the application materials and reference letters should be sent electronically to ak@inpcs.net mentioning “FPTh QG postdoc” in the subject line.
Contact: Alexey Koshelev (ak@inpcs.net) Letters of Reference should be sent to: ak@inpcs.net 