XIX<vPHHQP<XX
Welcome to the website supporting the virtual seminar series on Pseudo-Hermitian Hamiltonians in Quantum Physics.
This virtual seminar series is part of the regular real life seminar series on Pseudo-Hermitian Hamiltonians in Quantum Physics that was initiated by Miloslav Znojil in 2003. It is intended to bridge the gap, caused by the COVID-19 pandemic, between the real life XIXth meeting and the upcoming XXth meeting in Santa Fe in 2021. For past events see the PHHQP website. The subject matter of this series is the study of physical aspects of non-Hermitian systems from a theoretical and experimental point of view. Of special interest are systems that possess a PT-symmetry (a simultaneous reflection in space and time).
Proceedings: Journal of Physics: Conference Series Volume 2038

Upcoming: Sandra Klevansky, (Universität Heidelberg, Germany) 26/01/2023,15:00 London time (=15:00 GMT)
Underdetermined Dyson-Schwinger equations
Abstract: This talk examines the effectiveness of the Dyson-Schwinger (DS) equations as a calculational tool in quantum field theory. The DS equations are an infinite sequence of coupled equations that are satisfied exactly by the connected Green’s functions Gn of the field theory. These equations link lower to higher Green’s functions and, if they are truncated, the resulting finite system of equations is underdetermined. The simplest way to solve the underdetermined system is to set all higher Green’s function(s) to zero and then to solve the resulting determined system for the first few Green’s functions. The G1 or G2 so obtained can be compared with exact results in solvable models to see if the accuracy improves for high-order truncations. Five D=0 models are studied: Hermitian φ4 and φ6 and non-Hermitian iφ3, -φ4, and iφ5 theories. The truncated DS equations give a sequence of approximants that converge slowly to a limiting value but this limiting value always differs from the exact value by a few percent. More sophisticated truncation schemes based on mean-field-like approximations do not fix this formidable calculational problem.
This is joined work with Carl M. Bender and Christos Karapoulitidis
Check your local time here https://www.timeanddate.com/worldclock/
14:00 GMT = 15:00 in London = 10:00 New York = 23:00 Tokyo
Upcoming seminars
Sandra Klevansky, 26/01/23, 15:00 London time (=15:00 GMT)
Underdetermined Dyson-Schwinger equations
Wen-Yuan Ai, 09/02/23, 15:00 London time (=15:00 GMT)
A conjectural relation for the PT-symmetric -gφ 4-theory
Takanobu Taira, 23/02/23, 15:00 London time (=15:00 GMT)
TBA
Junggi Yoon, 09/03/23, 15:00 London time (=15:00 GMT)
TTbar deformation and negative norm states
The Seminars 2021: Term II – XIX(opens in a new tab)
Complete list of speakers
- Ali Mostafazadeh, (Koç University, Turkey) 07/05/2020
- Nick Mavromatos, (King’s College, Uni. of London, UK) 14/05/2020
- Phillip Mannheim, (University of Connecticut, US) 21/05/2020
- Fabio Bagarello, (University of Palermo, Italy) 04/06/2020
- Dorje Brody, (University of Surrey, UK) 18/06/2020
- Savannah Garmon, (Osaka Prefecture University, Japan) 02/07/2020
- Yogesh Joglekar, (Indiana Uni. Purdue University, US) 16/07/2020
- Andrei Smilga, (University of Nantes, France) 23/07/2020
- Eva-Maria Graefe, (Imperial College London, UK) 30/07/2020
- Avadh Saxena, (Los Alamos National Laboratory, US) 13/08/2020
- Li Ge, (City University of New York, US) 20/08/2020
- Carl Bender, (Washington University in St. Louis, US) 27/08/2020
- Vladimir Konotop, (Universidade de Lisboa, Portugal) 10/09/2020
- Joshua Feinberg, (University of Haifa and Technion, Israel) 24/09/2020
- Bhabani Prasad Mandal, (BHU, Varanasi, India) 08/10/2020
- Stéphane Boris Tabeu, (University of Yaounde, Cameroon) 15/10/2020
- Naomichi Hatano, (University of Tokyo, Japan) 22/10/2020
- Stefan Rotter, (Vienna University of Technology, Austria) 05/11/2020
- Maxim Chernodub, (Inst Denis Poisson, CNRS, France) 12/11/2020
- Pijush Ghosh, (Siksha-Bhavana, Visva-Bharati, India) 19/11/2020
- Mikhail Plyushchay, (Universidad de Santiago, Chile) 03/12/2020
- Qing-hai Wang, (National Univ. of Singapore, Singapore) 17/12/2020
- Gonzalo Muga, (University of the Basque Country, Spain) 14/01/2021
- Stella Schindler, (Massachusetts Institute of Technology, US) 21/01/2021
- Miloslav Znojil, (Nucl. Phys. Inst. of the AS, Czech Republic) 28/01/2021
- Roman Riser, (University of Haifa, Israel) 11/02/2021
- Duncan O’Dell, (McMaster University, Canada) 25/02/2021
- Mustapha Maamache, (Ferhat Abbas University, Algeria) 11/03/2021
- Andreas Ruschhaupt, (University College Cork, Ireland) 01/04/2021
- Hamidreza Ramezani, (Univ. of Texas Rio Grande Valley, US) 08/04/2021
- Andreas Fring, (City, University of London, UK) 22/04/2021
- Andrew Harter, (University of Tokyo, Japan) 06/05/2021
- Özlem Yeşiltaş, (Gazi University, Turkey) 20/05/2021
- Iveta Semorádová, (Czech Techn. Univ. Prague, Czech Republic) 03/06/2021
- Hugh Jones, (Imperial College London, UK) 17/06/2021
- Marta Reboiro, (University of La Plata, Argentina) 01/07/2021
- Ken Mochizuki, (Tohoku University, Japan) 15/07/2021
- Daniel Dizdarevic, (Universität Stuttgart, Germany) 29/07/2021
- Philip Mannheim, (University of Connecticut, US) 09/09/2021
- Latevi Lawson, (African Inst. for Math. Sciences, Ghana) 23/09/2021
- Jacob Muldoon, (Indiana University Purdue University, US) 30/09/2021
- Ross Wakefield, (University of Bristol, UK) 30/09/2021
- Abdelhafid Bounames, (University of Jijel, Algeria) 30/09/2021
- Himadri Barman, (Zhejiang University, China) 30/09/2021
- Andrei Smilga, (University of Nantes, France) 07/10/2021
- Takanobu Taira (City, University of London, UK) 14/10/2021
- Rebecca Tenney (City, University of London, UK) 14/10/2021
- Akhil Kumar, (Indian Inst. of Science Educ. and Res., India) 14/10/2021
- Kaustubh Argarwal, (Indiana University Purdue University, US) 14/10/2021
- Federico Roccati, (Università degli Studi di Palermo, Italy) 21/10/2021
- Ali Mostafazadeh, (Koç University, Turkey) 04/11/2021
- Yogesh Joglekar, (Indiana Uni. Purdue University, US) 18/11/2021
- Fabio Bagarello, (Università degli Studi di Palermo, Italy) 02/12/2021
- Kohei Kawabata, (University of Tokyo, Japan) 09/12/2021
- Tsuneya Yoshida, (University of Tsukuba, Japan) 16/12/2021
- Kazuki Yokomizo, (RIKEN National Science Institute, Japan) 06/01/2022
- Hamed Ghaemidizicheh, (Univ. Texas Rio Grande Valley, US) 20/01/2022
- Géza Lévai, (Institute for Nuclear Research, Hungary) 03/02/2022
- Aurelia Chenu, (University of Luxembourg, Luxembourg) 17/02/2022
- Adolfo del Campo, (Univ. of Luxembourg, Luxembourg) 03/03/2022
- Carl Bender, (Washington University in St. Louis, US) 17/03/2022
- Micheline Soley, (Yale Quantum Institute, US) 31/03/2022
- Michael Lubasch, (Quantinuum Ltd, UK) 14/04/2022
- Karl Landsteiner, (Inst. de Física Teórica UAM/CSIC, Spain) 28/04/2022
- Ion Cosma Fulga, (Leibniz Institute Dresden, Germany) 12/05/2022
- Barry Sanders, (University of Calgary, Canada) 26/05/2022
- Sujit Sarkar, (Poornaprajna Inst. of Scientific Res., India) 09/06/2022
- Gernot Akemann, (Universität Bielefeld, Germany) 23/06/2022
- Chia-Yi Ju, (National Sun Yat-sen University, Taiwan) 07/07/2022
- Eric Pap, (University of Groningen, The Netherlands) 21/07/2022
- Jan Wiersig, (Otto-von-Guericke University Magdeburg, Germany) 04/08/2022
- Stefan Rotter, (Vienna University of Technology, Austria) 06/10/2022
- Marco Merkli, (Memorial Univ. of Newfoundland, Canada) 13/10/2022
- Andrei Smilga, (University of Nantes, France) 20/10/2022
- Emil Bergholtz, (Stockholm University, Sweden) 27/10/2022
- Cancelled: Jacob Muldoon, (Indiana University Purdue Univ., US) 10/11/2022
- Fabio Bagarello, (Università degli Studi di Palermo, Italy) 24/11/2022
- Ali Mostafazadeh, (Koç University, Turkey) 01/12/2022
- Marta Reboiro, (University of La Plata, Argentina) 15/12/2022
- Carl Bender/Sandra Klevansky, (Washington University in St. Louis, US)/(Universität Heidelberg, Germany) 26/01/2023
- Wen-Yuan Ai, (King’s College London, UK) 09/02/2023
- Takanobu Taira, (The University of Tokyo, Japan) 23/02/2023
- Junggi Yoon, (Asia Pacific Center for Theoretical Physics, South Korea) 09/03/2023
- Latévi Lawson, (African Institute for Mathematical Sciences, Ghana) 23/03/2023
- Özlem Yeşiltaş, (Gazi University, Turkey) 09/04/2023