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May 2020
- 1 participants
- 1 discussions
02 May '20
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Table of Contents
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1. Conferences
1.1. Quantum spacetime and the Renormalization Group, Odense, Denmark
1.2. Mathematical perspectives of gravitation beyond the vacuum regime, Vienna, Austria
1.3. New CFP - Sixth Spacetime Conference
1.4. Long-term workshop "Gravity and Cosmology 2021", Kyoto, Japan
1.5. Gravity - The Next Generation, Kyoto, Japan
2. Jobs
2.1. Joint Postdoctoral Fellowship in Quantum Information/Quantum Gravity at The University of Hong Kong and The University of Oxford
2.2. Postdoc position in Gravitational Waves and Computational Relativity, Jena, Germany
2.3. PhD studentship in cosmology, Szczecin, Poland
2.4. Postdoc position in Quantum Gravity, Munich, Germany
2.5. PhD position in general relativity at Radboud University, Nijmegen, The Netherlands
3. News
3.1. Introductory textbook "Elements of General Relativity"
3.2. Lectures on GR
3.3. News on the Chalonge De Vega School
==============================================
1. Conferences
==============================================
1.1. Quantum spacetime and the Renormalization Group, Odense, Denmark
---------------------------------------------------------------
Announcement on Hyperspace@GU:
https://hyperspace.uni-frankfurt.de/?p=17158
Starting: 2020-10-12 to 2020-10-16
Location: Odense, Denmark (or online)
Additional Information: https://www.cp3-origins.dk/quantum-spacetime-and-the-renormalization-group/
Contact: eichhorn[AT]cp3.sdu.dk
This is the fifth in a series of workshops on Quantum Spacetime and the Renormalization Group, bringing together researchers exploring a broad range of research avenues in Quantum Gravity, including, but not limited to, Asymptotically Safe Gravity, Causal and Euclidean Dynamical Triangulations, Causal Sets, Group Field Theories, Spin Foam models and Tensor Models. Previous installments took place at the Perimeter Institute in 2014, at Nordita in 2015, at the Lorentz Center in Leiden in 2017 and in Bad Honnef in 2018.
The main goals of the workshop are
- contributing to sharpening the major conceptual and technical open questions of the field and identifying routes to answer these.
- triggering new collaborations, in particular between researchers from neighboring communities, enabling a fruitful exchange of ideas and transfer of knowledge.
- providing in particular young researchers with a comprehensive overview of the most pressing questions in the field and motivating them to tackle these from new angles.
- producing novel ideas how to bridge the gap between a fundamental theory of quantum gravity and observations and triggering new developments towards observational tests of quantum gravity.
Due to COVID-19, it could become necessary to organize the workshop in an online format. The dates October 12-16, 2020, would remain the same in this case.
The organizers are planning to make the decision about the format of the workshop (traditional or online) by the end of July, to allow sufficient time for travel arrangements in case the workshop can go ahead as originally planned.
Application for participation is now possible following the link on the webpage of the workshop.
All applicants for participation will be informed about the outcome of their application by the end of July. Please do not under any circumstances make any travel arrangements before you have received official confirmation of your successful registration and of the format of the workshop.
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1.2. Mathematical perspectives of gravitation beyond the vacuum regime, Vienna, Austria
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Announcement on Hyperspace@GU:
https://hyperspace.uni-frankfurt.de/?p=17162
Starting: 2021-02-01 to 2021-03-12
Location: Vienna, Austria
Additional Information: https://www.esi.ac.at/events/e388/
Contact: jeremie.joudioux[AT]aei.mpg.de
Organizers: Hakan Andreasson (Gothenburg), David Fajman (Vienna), Jeremie Joudioux (Potsdam), Todd Oliynyk (Monash).
We would like to announce the program "Mathematical perspectives of gravitation beyond the vacuum regime" to be held from Feb. 01, 2021, to March 15, 2021, at the Erwin Schroedinger International Institute for Mathematics and Physics in Vienna, Austria. This program is the sequel of the workshop organized at the ESI in 2017 on Vlasov matter. The focus is on self-gravitating matter models that include kinetic, fluid, elastic and field theoretical models. The main aim of the program is to drive progress by connecting researchers working on different matter models in general relativity and in Newtonian gravity, and by advertising open problems that can serve as an entry point for researchers from other areas. For further information, see the website.
Over the course of the program, two main events will take place:
1 A spring school (Feb. 15-19, 2021) on matter models in relativity. Lectures on the Einstein-Vlasov system, on the relativistic Vlasov-Maxwell system, on relativistic fluids, and on elasticity will be offered.
2 A workshop (Feb. 22-26, 2021) on recent advances in the field.
*Please note that attendance is limited at all times to 60 participants. Hence, the attendance to the spring school and the workshop is limited to 60 persons.*
*Limited support is available for the accommodation of students and post-docs.
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1.3. New CFP - Sixth Spacetime Conference
---------------------------------------------------------------
Announcement on Hyperspace@GU:
https://hyperspace.uni-frankfurt.de/2020/04/11/new-cfp-sixth-spacetime-conf…
Starting: 2020-09-28 to 2020-10-01
Location: Albena (famous Black Sea resort near Varna), Bulgaria
Additional Information: http://www.minkowskiinstitute.org/conferences/2020/
Contact: 2020conference(a)minkowskiinstitute.org
New Call for Papers
Sixth International Conference on the Nature and Ontology of Spacetime
Due to the present situation the conference will be held on 28 September - 1 October 2020
The Scientific Organizing Committee invites papers from physicists, philosophers of physics and philosophers on any topic related to the nature and ontology of spacetime. As there is no main theme of the sixth spacetime conference a number of special sessions have been suggested by colleagues (http://www.minkowskiinstitute.org/conferences/2020/call.html):
- Nature of time - Flow of time; Becoming (continuation of the Special Session on Becoming and the panel discussion at the Second Hermann Minkowski Meeting on the Foundations of Spacetime Physics on Wednesday, May 15, 2019)
- Is spacetime a real (physical) four-dimensional entity or a mathematical concept?
- Open Questions in Spacetime Physics
- The controversy over Relativistic Mass
- The problem with the gravitational energy-momentum pseudotensor in general relativity - should we have a closer look at the fact that the mathematical formalism of general relativity does not yield a proper tensor of the gravitational energy-momentum?
- What is the difference between matter and geometry in general relativity, semi-classical gravity, and quantum gravity?
- Do Black Holes Actually Exist?
- Is there a conflict between relativity and quantum mechanics?
- Quantum Gravity: Where do we stand?
Depending on the number of colleagues participating in a special session, we plan to publish a volume with the talks presented at the session, which will include constructive criticism and the replies of the authors.
Contributed papers in the form of extended abstracts of between one and two pages should be emailed to 2020conference(a)minkowskiinstitute.org by August 1, 2020. Submissions will be reviewed and notification of acceptance will be sent on August 17, 2020.
Scientific Organizing Committee:
Dennis Dieks (Utrecht University)
Mauro Dorato (University of Rome Three)
George F. R. Ellis (University of Cape Town)
Robert Geroch (University of Chicago)
Eleanor Knox (King's College London)
Vesselin Petkov (Minkowski Institute, Montreal)
Steven Savitt (University of British Columbia)
Anguel Stefanov (Bulgarian Academy of Sciences)
James Owen Weatherall (University of California, Irvine)
Christian Wuethrich (University of Geneva)
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1.4. Long-term workshop "Gravity and Cosmology 2021", Kyoto, Japan
---------------------------------------------------------------
Announcement on Hyperspace@GU:
https://hyperspace.uni-frankfurt.de/?p=17190
Starting: 2021-05-24 to 2021-06-25
Location: Kyoto, Japan
Additional Information: https://www2.yukawa.kyoto-u.ac.jp/~gc2021/index.php
Contact: gc2021[AT]yukawa.kyoto-u.ac.jp
We are going to have a long-term workshop "Gravity and Cosmology 2021" (GC2021) from May 24 to June 25, 2021 at Yukawa Institute for Theoretical Physics (YITP), Kyoto, Japan. This is one of series of long-term workshops held at YITP. The aim of the workshop is to gather researchers playing the leading roles in gravity and cosmology, and to have active discussions on the current problems and future directions.
The registration will open around October 2020 at the GC2021 website https://www2.yukawa.kyoto-u.ac.jp/~gc2021/index.php .
We look forward to having you in Kyoto.
SOC:
Masaki Ando (Tokyo), Emanuele Berti (Johns Hopkins), Rong-Gen Cai (ITP CAS), Vitor Cardoso (CENTRA), Antonio De Felice (YITP), Claudia de Rham (Imperial), Nathalie Deruelle (APC), Ruth Durrer (Geneva), Roberto Emparan (Barcelona), Ruth Gregory (Duhram), Renata Kallosh (Stanford), Eiichiro Komatsu (Max-Planck Inst.), Andrei Linde (Stanford), Shinji Mukohyama (YITP, Chair), Lisa Randall (Harvard), Misao Sasaki (IPMU), Masaru Shibata (AEI/YITP), Alexei Starobinsky (Landau Inst.), Masahiro Takada (IPMU), Takahiro Tanaka (Kyoto), Atsushi Taruya (YITP), Jean-Philippe Uzan (IAP), David Wands (Portsmouth)
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1.5. Gravity - The Next Generation, Kyoto, Japan
---------------------------------------------------------------
Announcement on Hyperspace@GU:
https://hyperspace.uni-frankfurt.de/?p=17191
Starting: 2021-06-07 to 2021-06-11
Location: Kyoto, Japan
Additional Information: https://www2.yukawa.kyoto-u.ac.jp/~gc2021/YKIS/index.php
Contact: gc2021[AT]yukawa.kyoto-u.ac.jp
We hold the symposium "Gravity - The Next Generation" at Yukawa Institute for Theoretical Physics (YITP), Kyoto in the 3rd week (June 7 - June 11, 2021) of the YITP long-term workshop "Gravity and Cosmology 2021" (GC 2021), aiming for comprehensive but intensive discussion on the rapidly expanding frontiers of physics of gravity and cosmology. The symposium also serves as the Yukawa International Seminar for the fiscal year 2021 (YKIS 2021).
Invited Speakers (*to be confirmed):
Masaki Ando (Tokyo/KAGRA), Emanuele Berti (Johns Hopkins), Patrick Brady (UWM/LIGO), Rong-Gen Cai (ITP CAS), Vitor Cardoso (CENTRA), Paolo Creminelli (ICTP)*, Karsten Danzmann (AEI/LISA), Claudia de Rham (Imperial), Nathalie Deruelle (APC), Ruth Durrer (Geneva), Roberto Emparan (Barcelona), Renata Kallosh (Stanford), Eiichiro Komatsu (Max-Planck Inst.), Andrei Linde (Stanford), Enrico Pajer (Cambridge)*, Tsvi Piran (Hebrew), Lisa Randall (Harvard), Misao Sasaki (IPMU), Leonardo Senatore (Stanford), Masaru Shibata (AEI/YITP), Alexei Starobinsky (Landau Inst.), Masahiro Takada (IPMU)*, Jean-Philippe Uzan (IAP)*, Johannes van den Brand (Nikhef/Virgo), David Wands (Portsmouth)
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==============================================
2. Jobs
==============================================
2.1. Joint Postdoctoral Fellowship in Quantum Information/Quantum Gravity at The University of Hong Kong and The University of Oxford
-------------------------------------------------------------
Announcement on Hyperspace@GU:
https://hyperspace.uni-frankfurt.de/?p=17153
Deadline: 2020-09-01
Location: Hong Kong
Additional Information: http://www.qiss.fr
Contact: destiny.chen[AT]cs.ox.ac.uk
*Work at distance employment possible as soon as MAY 2020, deadline is rolling until post filled*
Joint Postdoctoral Fellowship in Quantum Information/Quantum Gravity at The University of Hong Kong and The University of Oxford
Applications are invited for a 2-year postdoctoral fellowship in a joint post between the Departments of Computer Science of The University of Hong Kong and the University of Oxford. The successful candidate will be be an independent and highly motivated researcher capable of working productively with the two groups on topics at the intersection between quantum information theory, quantum gravity, and quantum field theory. Previous experience in at least one of these areas is required.
The post is partly funded with by the John Templeton Foundation through the project "The Quantum Information Structure of Spacetime" (qiss.fr). The successful candidate is expected to contribute to the goals of this project, and to join the activities of the newly-established HKU-Oxford Joint Lab for Quantum Information and Computation, becoming a member of the Quantum Information and Computation Initiative led by Giulio Chiribella, and of the Quantum Group co-led by Bob Coecke at Oxford Computer Science.
The target start date of the post is in May 2020 or as soon as possible thereafter, although candidates will be considered also after that date until the post is filled. The successful candidate is expected to spend one year at the University of Hong Kong and oner year at the University of Oxford. Given the developing situation with covid-19, we will consider remote work arrangements while travel is restricted.
Candidates are invited to send a CV and a cover letter and arrange for at least two letters of recommendation to destiny.chen[at]cs.ox.ac.uk.
Applications are particularly welcome from under-represented groups in Computer Science.
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2.2. Postdoc position in Gravitational Waves and Computational Relativity, Jena, Germany
-------------------------------------------------------------
Announcement on Hyperspace@GU:
https://hyperspace.uni-frankfurt.de/2020/04/07/postdoc-positions-in-gravita…
Deadline: 2020-06-01
Location: Jena
Additional Information: http://www.tpi.uni-jena.de/~bernuzzi/news-jobs.html
Contact: sebastiano.bernuzzi[AT]uni-jena.de
Applications are invited for one postdoctoral positions in the field of gravitational waves and/or computational relativity at the University of Jena. The position is associated with the research group of Prof. Sebastiano Bernuzzi at the Theoretical Physics Institute Jena and funded by Jena FSU. The successful candidate is expected to work on the topic of compact binaries in general relativity, including computational aspects in numerical relativity, gravitational waveform modeling and data-analysis applications. The group is part of the Virgo Collaboration and of the ENGRAVE collaboration and there is the possibility to join and participate to those�� gravitational-wave astronomy programmes. The group is also part of the computational relativity (CoRe) collaboration.
The appointment will be for two years. Candidates with experience in analytical and numerical relativity, computational astrophysics, gravitational-wave modeling and data analysis are particularly encouraged to apply. Please submit a cover letter, a curriculum vitae with a list of publications, a brief description of research interests, and a list of three potential referees, who may be contacted separately. Applications should be received by June 1st, 2020, but will be considered until the positions are filled. Starting date can be as early as December 2020 and possibly no later than February 2021. Please send applications to:
sebastiano.bernuzzi[AT]uni-jena.de
Theoretisch-Physikalisches Institut
Friedrich-Schiller-Universitaet Jena
Max Wien Platz 1
D-07743 Jena, Germany
Please use the string "Application for PD position - SURNAME NAME" in the Email subject and send the documents as a single PDF file.
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2.3. PhD studentship in cosmology, Szczecin, Poland
-------------------------------------------------------------
Announcement on Hyperspace@GU:
https://hyperspace.uni-frankfurt.de/2020/04/27/ph-d-studentship-in-cosmolog…
Deadline: 2020-06-30
Location: Szczecin, Poland
Additional Information: https://cosmo.usz.edu.pl/node/349
Contact: vincenzo.salzano[AT]usz.edu.pl
The Szczecin Cosmology Group at the Institute of Physics of the University of Szczecin invites applications for a Ph.D. studentship in cosmology.
The research will focus onto: alternative theories of gravity; in-depth study of the nature of dark energy and dark matter by using novel cosmological and astrophysical probes; Generalized Uncertainty Principle (GUP) and Lorentz Invariance Violation (LIV) tested by observations. Candidates with both theoretical and numerical expertise are welcome, reminding that observational testing will be a key issue of the project. Thus, preference will be given to candidates with a strongly declared willingness to learn and work also on data analysis.
The deadline for a preliminary application is 30st June 2020. Shortlisted candidates will be invited for interviews on 6th-8th July 2020. After this date and by 21h August 2020, successful candidates will have to register at the Doctoral School of the University of Szczecin, following some extra admission procedure supervised by professors from the cosmology group.
The studies will begin on the 1st October 2020 and last for 4 years, following schedules and rules of the Doctoral School. The grant from the Doctoral School will amount to about 2000 PLN for the first two years, and to about 3200 PLN for the following years. For the first two years, an additional funding of 4000 PLN will be provided by the Polish National Center for Research and Development through the University of Szczecin. Moreover, the University of Szczecin opens multiple grant calls for excellent students starting from the second year of studies. There is the possibility for a cheaper university-supported accommodation; travel fund is also available. The city of Szczecin is located near to Polish border with Germany - 130 km away from Berlin, with good access to international airports.
Applications should include: CV; list of publications; a brief statement of research interests; a copy of graduate studies diploma (M.Sc.) and transcripts of the exams; a copy of the thesis; at least 1 letter of recommendation, to be sent directly to the addresses below.
Applications and recommendations should be sent by email to both prof. Mariusz P. Dabrowski (mariusz.dabrowski[at]usz.edu.pl) and to prof. Vincenzo Salzano (vincenzo.salzano[at]usz.edu.pl).
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2.4. Postdoc position in Quantum Gravity, Munich, Germany
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Announcement on Hyperspace@GU:
https://hyperspace.uni-frankfurt.de/?p=17212
Deadline: 2020-05-15
Location: Munich, Germany
Additional Information: https://www.theorie.physik.uni-muenchen.de/index.html
Contact: daniele.oriti[AT]physik.lmu.de
Postdoctoral position in Quantum Gravity
Applications are invited from outstanding candidates for a postdoctoral research position in Quantum Gravity, starting in the Fall 2020, at the Arnold Sommerfeld Center for Theoretical Physics, Ludwig-Maximilians-University, Munich, Germany. For more information about the center, see the webpage https://www.theorie.physik.uni-muenchen.de/index.html.
The successful candidate will be affiliated with the quantum gravity group led by Dr. Daniele Oriti, and expected to work independently, as well as in collaboration with the group leader and other members of the group.
The position is funded by DFG for two years. An extension for a third year, depending on performance and availability of funds, could be possible, but will have to be decided at a later stage.
The funded DFG project focuses on emergent spacetime and the extraction of effective continuum physics from group field theory models, in particular in the context of fundamental cosmology and quantum black holes, applying also methods and ideas from quantum information. Solid expertise in the group field theory formalism and/or in related quantum gravity approaches, e.g. loop quantum gravity, tensor models, spin foam models, discrete quantum gravity, would be a strong advantage. Expertise in cosmology, black hole physics, and/or quantum information techniques in quantum many-body systems would be another useful asset.
The review of applications will start on the 15th of May 2020, but applications will be considered until the position is filled.
The required application documents are: CV, list of publications, statement of research interests (of no more than 3 pages), and two reference letters. The documents have to be sent to
Daniele Oriti �� �� daniele.oriti[AT]physik.lmu.de
Please use the subject line (also for reference letters): postdoc application "name of applicant"
The Ludwig-Maximilians-University, Munich, is an equal opportunity employer,��which��values diversity,��so applications from any minority scholars are strongly encouraged.
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2.5. PhD position in general relativity at Radboud University, Nijmegen, The Netherlands
-------------------------------------------------------------
Announcement on Hyperspace@GU:
https://hyperspace.uni-frankfurt.de/?p=17214
Deadline: 2020-07-01
Location: Nijmegen, The Netherlands
Additional Information: https://www.ru.nl/imapp/
Contact: bbonga[AT]science.ru.nl
A PhD position in general relativity and gravitational wave physics is available at the Institute for Mathematics, Astrophysics and Particle Physics (IMAPP) of the Radboud University in Nijmegen, The Netherlands. The successful applicant will work under the supervision of B. Bonga in the High-Energy Physics department and be part of an active research group in classical/strong and quantum gravity. The IMAPP provides an attractive working environment for foundational, front-line research. Besides Theoretical High-Energy Physics, Mathematical Physics, Astrophysics and Experimental High-Energy Physics are all strongly represented. The candidate is expected to start the position in October 2020, but an earlier or later starting date can be discussed.
Requirements
Applicants must have a university degree in (theoretical) physics at the masters level or equivalent and proven abilities in theoretical physics and mathematics. The PhD position is for four years, which is the expected time for obtaining a doctoral degree in the Netherlands, and is subject to a review after one year.
Position
PhD students are required to take a number of courses, usually in the form of attending winter schools organized by the Dutch Research School for Theoretical Physics. They also act as teaching assistants for about ten percent of their working time (usually as tutors for exercise classes of theoretical courses for bachelor or masters students) and are paid according to nationally set standard rates.
Application
The application should include your CV highlighting your research experience (if any), transcripts of university grades and degrees and a statement of research interests and motivation (one-two pages). In addition, the applicant should arrange that (at least) two reference letters, one of which should be from your master thesis supervisor, are sent directly to the email address below.
Candidates are encouraged to apply as soon as possible. The deadline for full consideration is July 1st, 2020. Applications should be sent electronically as pdf-file(s) to B. Bonga (bbonga AT science.ru.nl).
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3. News
==============================================
3.1. Introductory textbook "Elements of General Relativity"
------------------------------------------------------------
Announcement on Hyperspace@GU:
https://hyperspace.uni-frankfurt.de/2020/04/02/introductory-textbook-elemen…
Additional Information: https://www.springer.com/gp/book/9783030284152
New textbook, "Elements of General Relativity", by Piotr T. Chrusciel, published by Birkhaeuser Science.
The book is meant to provide a concise modern introduction to the mathematical tools of General Relativity. It is a book at entry-level to the field, addressed to students of physics and mathematics.
From the publisher's info:
This book provides an introduction to the mathematics and physics of general relativity, its basic physical concepts, its observational implications, and the new insights obtained into the nature of space-time and the structure of the universe. It introduces some of the most striking aspects of Einstein's theory of gravitation: black holes, gravitational waves, stellar models, and cosmology. It contains a self-contained introduction to tensor calculus and Riemannian geometry, using in parallel the language of modern differential geometry and the coordinate notation, more familiar to physicists. The author has strived to achieve mathematical rigour, with all notions given careful mathematical meaning, while trying to maintain the formalism to the minimum fit-for-purpose. Familiarity with special relativity is assumed.
The overall aim is to convey some of the main physical and geometrical properties of Einstein's theory of gravitation, providing a solid entry point to further studies of the mathematics and physics of Einstein equations.
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3.2. Lectures on GR
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Announcement on Hyperspace@GU:
https://hyperspace.uni-frankfurt.de/2020/04/02/lectures-on-gr/
Additional Information: https://www.youtube.com/channel/UCsz6GM8EcLkaGIauutfSeJg/
If you're trying to teach (or learn) general relativity remotely, this might be helpful: I have posted a complete set of introductory GR lectures (Khan academy style) on the youtube channel "Physics Unsimplified". The early lectures are rough, but the later ones are much better. Here's the link:
https://www.youtube.com/channel/UCsz6GM8EcLkaGIauutfSeJg/
Lecture slides with errata are posted here:
https://physicsunsimplified.com/
David Brown
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3.3. News on the Chalonge De Vega School
------------------------------------------------------------
Announcement on Hyperspace@GU:
https://hyperspace.uni-frankfurt.de/2020/04/25/news-on-the-chalonge-de-vega…
Additional Information: https://chalonge-devega.fr/Programme2020.html
Ecole Internationale d'Astrophysique Daniel Chalonge - Hector de Vega.
- Open Science and Open Access -
1. Last news 2020
2. A chronicle of the pandemia containment
3. Daniel Chalonge and Hector de Vega medals 2020
4. Agenda 2020
1. Last news : Quantum discrete levels of the universe from the early trans-planckian vacuum to the late dark Energy: Norma G. Sanchez.
Constraints on dynamical dark energy models from massive high redshift galaxies: Nicola Menci .
Unifying quantum mechanics and Einstein general relativity:
2. Chronicle of a confinement: A short break of 3min15 duration while working in times of pandemia coronavirus: April 2020, document with video of 3m15 and 2 images:
3. A surprise Award: Daniel Chalonge and Hector de Vega medals 2020:
The two medals are awarded this year to Dr Adam G. Reiss (Johns Hopkins University and SSTI, Baltimore) Nobel Prize in Physics in Cosmology. The medals are awarded for his contribution to the discovery of dark energy, to its interpretation as a cosmological constant and to his continuous results on the Hubble constant. More information about the medal presentation will be given after the summer.
4. Agenda 2020: Next event: Open Session on Thursday June 18, 2020 at the College of Spain, Cite' Internationale Universitaire de Paris, 27A boulevard Jourdan, Paris 14e. confirmed. Free entry, free and without registration.
Find the Programme 2020 New Universe and New Black Holes, Quantum
Physics and Dark Energy, and the news January-March 2020 at :
https://chalonge-devega.fr/Programme2020.html
Find the Chalonge - de Vega School online: videos, conferences, reports, archives, photo albums: https://chalonge-devega.fr/
"And that is not all" (quote from Henri Poincare')...
With compliments and the best wishes for good health
Ecole Chalonge - de Vega, 30 pioneering years of activity always ahead and in the head news
https://chalonge-devega.fr
https://chalonge-devega.fr/HdeV.html
https://chalonge-devega.fr/sanchez
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