# About Us

**Information about the people behind Einstein Online – from the editorial team and our authors to the scientific advisory council.**

## Publisher

*Einstein-Online* is published by the Max Planck Institute for Gravitational Physics (Albert Einstein Institute) in Potsdam, Germany.

## Editorial board

Jens Kube is a trained astrophysicist and a freelance science communicator. Since 2018, he is the editor for Einstein-online.

is research coordinator at the Albert Einstein Institut. She is responsible for all organizational issues regarding the Einstein Online website.

is managing scientist of Haus der Astronomie, the Center for Astronomy Education and Outreach in Heidelberg, and senior outreach scientist at the Max Planck Institute for Astronomy. During his time at the Albert Einstein Institute, he created the *Einstein Online* website as one of the institute’s contributions to the World Year of Physics 2005 (Einstein year). He has written the introduction Elementary Einstein, the relativistic dictionary, numerous spotlights on relativity as well as creating all original texts, translations and images for which no explicit source is given – these images were redesigned by Daniela Leitner.

## Screendesign / Programmierung

is a German Communication Designer with a great passion for explaining science. She developed the screen design and illustrations for *Einstein Online*.

is responsible for the maintenance and web programming on Einstein Online – part of his responsibilities as web programmer for the Max Planck Campus in Golm/Potsdam, where the Albert Einstein Institute is situated.

## Authors

works as a scientist at the Albert Einstein Institute in Hannover and the University of Hannover, where he is involved in the maintenance and development of the gravitational wave detector GEO600.

is a scientist at the Albert Einstein Institute in Hannover. During his time as a graduate student in the astrophysics group of the Albert Einstein Institute in Potsdam, he searched for gravitational and radio waves from quickly rotating neutron stars.

is a professor of astrophysics and space science at the University of Leicester. His research interests are hot white dwarfs, the interstellar medium, and the development and operation of detectors for observing these astronomical objects. He is a co-author (with V. Trimble) of the spotlight text Gravitational redshift and White Dwarf stars.

is professor for theoretical physics at the Institute for Theoretical Physics of Heidelberg University. His research is concerned with what galaxy clusters, gravitational lensing and the cosmic background radiation can tell us about cosmic structure formation. For Einstein Online, he has written the spotlight text Cosmic sound, and he is also a member of Einstein Online’s Scientific Advisory Board.

is professor for theoretical physics at the Center for Astronomy of Heidelberg University. His research is concerned with what galaxy clusters, gravitational lensing and the cosmic background radiation can tell us about cosmic structure formation. For Einstein Online, he has written the spotlight text Cosmic sound, and he is also a member of Einstein Online’s Scientific Advisory Board.

is head of the “Dissemination of Time” working group at the Physikalisch-Technische Bundesanstalt in Braunschweig.

is an Associate Professor of Physics at Penn State University, where his research is concerned with cosmological applications of loop quantum gravity. More details can be found in the spotlight topics he wrote for *Einstein Online*, Avoiding the big bang and Taming infinity with loops, during his time as a staff scientist at Albert Einstein Institute.

is J. C. Carter Emeritus Professor of Theoretical Physics at Loyola University in New Orleans. He is one of the co-inventors of Jordan-Brans-Dicke theory, an extension of general relativity. More recently he has been involved in investigations of the physical significance of recent exotic discoveries in the subfield of mathematics known as differential topology.

is an assistant professor of physics at the University of Mississippi. His research interests are quantum gravity and cosmology, including the intriguing possibility that particle accelerators might produce miniature black holes – which is also the topic of his contribution to *Einstein Online*, the spotlight text Particle accelerators as black hole factories?

is professor of gravitational physics at the University of Vienna. His research covers a wide range of mathematical topics related to Einstein’s equations, from the classification of black holes and cosmic censorship to the definition of mass in general relativity. During his time at the Laboratory for Mathematics and Theoretical Physics of Université de Tours he has written for Einstein Online the spotlight topics How many kinds of (stable) black hole? and The many ways of building an empty model universe.

Tim Dietrich uses computer simulations to calculate the gravitational waves and electromagnetic signals emitted during the collision of neutron stars.

He has received several awards for his work on gravitational wave astronomy and is the head of the department of theoretical astrophysics at the University of Potsdam.

was a graduate student in the quantum gravity group at Albert Einstein Institute in Potsdam from 2004 to 2005. For , she wrote the spotlight topic Simplicity in higher dimensions.

is an associate professor of physics at the University of Valencia. His research interests are numerical relativistic (magneto)-hydrodynamics and numerical relativity. His contribution to *Einstein Online* is the spotlight text The realm of relativistic hydrodynamics.

is a professor of physics at Oakland University. His main research interest is numerical relativity, in particular the simulation of spacetime in the vicinity of singularities. He describes some of his results in the spotlight text Of singularities and breadmaking.

is an Associate Professor of Physics at Virginia Commonwealth University. His main research interest is in the geometrical properties of spacetimes that follow from Einstein’s equations. His contribution to is the spotlight text Of gravitational waves and spherical chickens describing a family of spacetimes explored by him and, since, by many others.

Gerhard Heinzel is a physicist at the Max Planck Institute for Gravitational Physics in Hanover and leader of the space interferometry research group.

Magdalena Kersting is a physics educator and science communicator.

is a professor of physic at Hildesheim University. Her research interests range from the physics of accreting pulsars to the visualization and didactic aspects of relativity theory. Visualization is also the key ingredient of her Einstein Online contribution, authored while she was employed by Albert Einstein Institute, Potsdam and a member of the Theoretical Astrophysics group at Eberhard Karls University, Tübingen: the spotlight topic Descent into a black hole.

is a senior scientist in the astrophysics group at Albert Einstein Institute in Hannover, were he participates in the data analysis for the gravitational wave detectors GEO 600 and LIGO. His research interests also include the fundamental physics of black holes.

Andrzej Krolak is a staff member at the Institute of Mathematics of the Polish Academy of Sciences. His area of research encompasses gravitation and general relativity. Currently, the focus of professor Krolak’s work is on the analysis of data obtained by gravitational wave detectors.

Jens Kube is a trained astrophysicist and a freelance science communicator. Since 2018, he is the editor for Einstein-online.

was a graduate student in the geometric analysis group at Albert Einstein Institute in Potsdam between 2003 and 2006. His research concerned the geometry of curved spaces – including, but not restricted to those occuring in general relativity. His *Einstein Online* contribution is the spotlight topic Einstein and soap bubbles.

is an Associate Professor of Mathematics at the University of Nottingham. His main research interest is quantum gravity, including quantum cosmology, about which he has written the spotlight text Searching for the quantum beginning of the universe.

is a computer scientist at the Albert Einstein Institute in Hannover, where he works on the data analysis of the gravitational wave detectors LIGO and GEO600. He is a major contributor to the Einstein@Home project. During his time at the Albert Einstein Institute in Potsdam he was, unsurprisingly, co-author of the spotlight topic Einstein@Home – gravitational waves for everybody.

Emanuel Malek is a theoretical physicst, working on various aspects of string theory, at Humboldt University Berlin.

is editor-in-chief of “Sterne und Weltraum”. He wrote his contributions to Einstein online during his time as post-doctoral researcher at the Max Planck Institute for Extraterrestrial Physics, where he was doing research on black holes and the diverse astronomical phenomena for which they are responsible.

is a geoscientist and science communicator based in Bremen, Germany.

is managing scientist of Haus der Astronomie, the Center for Astronomy Education and Outreach in Heidelberg, and senior outreach scientist at the Max Planck Institute for Astronomy. During his time at the Albert Einstein Institute, he created the *Einstein Online* website as one of the institute’s contributions to the World Year of Physics 2005 (Einstein year). He has written the introduction Elementary Einstein, the relativistic dictionary, numerous spotlights on relativity as well as creating all original texts, translations and images for which no explicit source is given – these images were redesigned by Daniela Leitner.

is a scientist at the Albert Einstein Institute in Hannover. His research interests include neutron stars and the detection of gravitational waves. He is one of the developers of the Einstein@Home project; fittingly, he is co-author of our spotlight topic Einstein@Home – gravitational waves for everybody, written during his time as a post-doctoral researcher in the astrophysics group at Albert Einstein Institute in Potsdam.

is professor of mathematics at Johannes Gutenberg University in Mainz, Germany. Until 2013, he worked as a group leader in the geometric analysis and gravitation research department at Albert Einstein Institute. His main research interest at the time was mathematical cosmology. His contribution to Einstein Online is the spotlight The mathematical universe.

is Senior Scientific Editor of the Collected Papers of Albert Einstein, the Einstein Papers Project at the California Institute of Technology. His main research interest are Einstein’s writings about relativity and his unified field theories. His contribution to *Einstein Online* is the spotlight text A brief history of gravitational lenses.

Gerhard Schäfer is Professor of Theoretical Physics and Relativistic Astrophysics at the Friedrich Schiller University in Jena. His research focuses on the analytical treatment of the dynamics of compact objects in the framework of post-Newtonian approximations of general relativity.

is the Timken University Professor at Harvard University and a Senior Scientist of the Smithsonian Institution. He works at the Harvard-Smithsonian Center for Astrophysics in Cambridge, MA. His research interests involve applications of radio and radar techniques to problems in geophysics, planetary physics, and astrophysics. He also devised and carried out precision tests of general relativity within our solar system; his contribution to *Einstein Online* is the spotlight text Gravitational deflection of light (with S. Shapiro).

is an Associate Professor of Physics and Associate Academic Dean at Guilford College in Greensboro, NC. His research interests are in the dynamics of the Earth’s upper mantle, seismology, and, most recently, precision measurements of light deflection near the sun. For *Einstein Online*, he has written the spotlight text Gravitational deflection of light (with I. Shapiro).

Masaru Shibata is director of the department Computational Relativistic Astrophysics at the Max Planck Institute for Gravitational Physics in Potsdam and professor at the Yukawa Institute for Theoretical Physics, Kyoto University, Japan.

s a long-term researcher at the Perimeter Institute for Theoretical Physics in Waterloo, Canada, and an adjoint professor at the University of Waterloo. His main research interest is in quantum gravity, with a particular focus on loop quantum gravity. His contribution to Einstein Online is the spotlight topic Actors on a changing stage: quantum gravity and background independence.

is emeritus professor of physics at Syracuse University, New York State, and a senior researcher at the Perimeter Institute for Theoretical Physics in Waterloo, Canada. His current research centers on the causal set hypothesis as the basis of a theory of quantum gravity; consequently, his contribution to Einstein Online is the spotlight topic Geometry from order: causal sets.

is a scientist and research group leader at Albert Einstein Institute, where he carries out research on string theory. His contributions to Einstein Online are the spotlight topics Extra dimensions – and how to hide them, The embedded universe and The hunt for extra dimensions.

is a professor of physics at Erlangen University. His research is concerned with all aspects of loop quantum gravity. His contribution to Einstein Online, the spotlight The fabric of space, was written while he was a scientist at the Albert Einstein Institute and an Associate Professor at the University of Waterloo in Canada.

is a professor of physics at the University of California, Irvine, and staff astronomer at Las Cumbres Observatory. Her research interests are the structure and evolution of stars, galaxies, and the universe, and of the communities of scientists who study them. For Einstein Online, she has revisited research from her days as a graduate student with the spotlight text Gravitational redshift and white dwarfs (co-authored with M. Barstow).

is a professor of theoretical physics at **Karlstad University**. His current main research interest is the physical applications and mathematical features of general relativity, from how the properties of matter influence spacetime geometry to how strong spacetime curvature affects matter, and spacetime itself. For *Einstein Online*, he has written a spotlight text dealing with one of the most disturbing features of Einstein’s theory of gravity: Spacetime singularities.

Achim Weiss is a scientist at the Max Planck Institute for Astrophysics in Garching near Munich, in Germany. His main area of research is stellar physics. One part of his work concerns the evolution of Lithium-plateau stars, which is important for observational tests of the predictions of Big Bang Nucleosynthesis. To Einstein Online, he has contributed the spotlight texts Big Bang Nucleosynthesis, Equilibrium and Change, and Elements of the past.

## Scientific Advisory Board

The members of the scientific advisory board are responsible for quality assurance on *Einstein Online*. They review all new material that is added to the website. In addition, they suggest new “spotlights on relativity” and suitable authors.

is professor of mathematics at Johannes Gutenberg University in Mainz, Germany. Until 2013, he worked as a group leader in the geometric analysis and gravitation research department at Albert Einstein Institute. His main research interest at the time was mathematical cosmology. His contribution to Einstein Online is the spotlight The mathematical universe.

is a Director Emeritus at the Albert Einstein Institute in Potsdam. His main research interest is in the physics and detection of gravitational waves.

is a scientist and research group leader at Albert Einstein Institute, where he carries out research on string theory. His contributions to Einstein Online are the spotlight topics Extra dimensions – and how to hide them, The embedded universe and The hunt for extra dimensions.

is a professor of physics at Erlangen University. His research is concerned with all aspects of loop quantum gravity. His contribution to Einstein Online, the spotlight The fabric of space, was written while he was a scientist at the Albert Einstein Institute and an Associate Professor at the University of Waterloo in Canada.

## Special thanks to …

Marilyn Daily for her invaluable editorial work on the English version of Elementary Einstein; Badri Krishnan and Dennis Pollney for their help with English translations; Luciano Rezzolla for acting as a reviewer; Susanne Milde and the kind people of Milde Marketing Science Communication for their support with public relations.

The IT department at Albert Einstein Institute for their continuing support of this website.

*Einstein Online* will always remember Jürgen Ehlers (1929-2008), who was the founding director of Albert Einstein Institute in Potsdam. His research covered a diversity of aspects of general relativity. His continued support and advice have been invaluable for making this web portal what it is. Further information, including an obituary, can be found here.