110 search results for “gravity” in the Public website
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Probing Gravity at Cosmic Scales
The theoretical explanation of cosmic acceleration is nowadays one of the biggest puzzles in cosmology.
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Testing gravity on the largest scales with kids and friends
What are the 'dark' components of the universe?
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Aspects of cosmic acceleration
The focus of the dissertation "Aspects of cosmic acceleration" is the study of possible mechanisms responsible for the late-time accelerated expansion of the universe.
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Ten years later: what about Erik Verlinde and his theory?
Ten years after its introduction, the controversial idea of Erik Verlinde on gravity is still a hotly debated topic, and is still surrounded by a cloud of scepticism. Scepticism in which the media have played a major role, theoretical physicst Koenraad Schalm says in an article by NWO. ‘The media simply…
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Transport coefficients and low energy excitations of a strongly interacting holographic fluid
In this thesis, classes of strongly interacting quantum field theories, have been studied.
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Studying dark matter using weak gravitational lensing : from galaxies to the cosmic web
Of all the mass in our Universe, 80% is thought to consist of a hypothetical and invisible substance called dark matter (DM).
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Into the Darkness: Forging a Stable Path Through the Gravitational Landscape
In this thesis we study the landscape of gravitational models which modify GR by introducing an additional scalar degree of freedom (d.o.f.) to source Cosmic Acceleration.
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Axions, Anomalies and Gravity
Lecture
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The Cost of Altering Gravity?
Lecture
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Axions, Anomalies and Gravity II
Lecture
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Probing Gravity at Cosmic Scales
PhD Defence
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Alessandra Silvestri Group (the Late Universe)
We are cosmologists, in other words we use physics to study the Universe, how it started and evolved into the structure that we observe around us.
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Citizen Science and Networks
How can citizen science be used to communicate and provide data for social network analysis?
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The Diving Dutchman
Promotores: Prof.dr. F. van Lunteren, Prof.dr. F.S. Gaastra
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Uniform infinite and Gibbs causal triangulations
Promotor: Richard D. Gill
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Nathaniel Martin in de Volkskrant about toilets in space
German scientists and NASA have developed a bacteria-killing coating for space toilets. With this coating they hope to protect astronauts in space stations from pathogens. Professor of Biological chemistry Nathaniel Martin sheds light on the discovery: 'You don't expect nasty bacteria up there, but…
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The holographic glass bead game: from superconductivity to time machines
Promotores: Prof.dr. J. Zaanen & Prof.dr. K.E. Schalm
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Multimessenger astronomy to study the structure of Milky Way
For centuries, astronomers have studied the universe by collecting light signals. Since 2015, the confirmation of an important prediction of Einstein allows us to explore the universe in a new way: through gravitational wave radiation. Astronomy PhD candidate Valeriya Korol proposes to use these gravitational…
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Livestream: Sean Carroll gives Ehrenfest Colloquium
On Wednesday September 26th, theoretical physicist Sean Carroll will give an Ehrenfest colloquium. It is part of a lecture series that has been running since 1912 and was founded by physicist Paul Ehrenfest.
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The Lead Zeppelin
As an alternative to the diving board shaped force sensor, we are now developing a magnetically levitated small superconducting particle – or ‘Lead Zeppelin'' – as our mechanical resonator. We explore routes towards detection of gravity between small objects.
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Leiden Consortium on Individual Development (L-CID)
Why are not all children equally responsive to variations in the social environment?
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Prominent physicist Maldacena gives Ehrenfest Colloquium
On November 21, theoretical physicist Juan Maldacena gives the Ehrenfest Colloquium. Maldacena is known worldwide as the inventor of AdS/CFT correspondence, which might be key to a theory of quantum gravity. Maldacena is winner of the prestigious Dirac Prize and the Breakthrough Prize in Fundamental…
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Physics Nobel Prize for former Leiden Lorentz Professor
The 2017 Nobel Prize in Physics has been awarded to Rainer Weiss, Barry Barish and Kip Thorne for their work on the measurement of gravitational waves. Thorne was Lorentz Professor in 2009 in Leiden. Physicist Jan Willem van Holten explains why this is such an important discovery. ‘A new branch of astrophysics…
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Digital Force: Life, Liberty & Livelihood in the Information Age
On 9 May 2018, Roy van Keulen defended his doctoral thesis 'Digital Force: Life, Liberty & Livelihood in the Information Age'. The doctoral research was supervised by Prof. dr. A. Ellian.
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Higgs dynamics in the early universe
In the early universe, the dynamics of the Higgs field can give rise to many interesting phenomena.
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Perception of multidimensional speech sounds in humans and songbirds
Do humans and zebra finches share cognitive mechanisms that are important for speech perception?
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Inferno Worlds
A remarkable population of short period transiting rocky exoplanets with equilibrium temperatures on the order of 2,000 K has recently been discovered.
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Asian Law
In this lecture professor Harding considered the implications of Asia's 21st-century rise for its legal systems and our approaches to studying them in the new situation we confront in the early 21st century.
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Tjerk Oosterkamp Lab
We explore the possibilities to combine magnetic resonance techniques with atomic force microscopy together in a single microscope: the MRI-AFM, also called Magnetic Resonance Force Microscopy (MRFM).
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Neurogenomics of vocal learning
How does FoxP1 affect auditory perception on a behavioural and genomic level?
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4.9 milion euros for unraveling the mysteries of black holes
The Dutch Black Holes Consortium receives 4.9 million euros from NWO for unravelling the mysteries of black holes and other mysteries of the universe. The Astronomy and Society group at Leiden Observatory is affiliated to use the leading research to introduce people of all ages and background, and children…
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New light on dark matter
An international team of astronomers has found an unexpected link between dark matter and visible stars in stellar systems. This discovery may even cause us to reconsider our understanding of gravity. They published on their discovery in 'Nature' on 1 October.
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Making cells ultra-heavy
The life of a fibroblast is heavy, but PhD student Julia Eckert makes it 19.5 times heavier, using the Large Diameter Centrifuge at the ESTEC space research centre in Noordwijk.
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Auxin
Mathematical and computational analysis of the dynamics of polar transport of the plant hormone auxin.
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A piece of the Universe in the computer
Simulations of galaxies help researchers understand astronomical observations better. The EAGLE simulation, a large project in which Leiden astronomers play a leading role, shows the evolution of the Universe, from just after the Big Bang to the present day.
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Galaxies and the structures in which they are embedded
Researchers at Leiden Observatory study the fundamental physics that creates structure in the Universe. These processes collect matter into galaxies and gas into stars. With the use of powerful telescopes and advanced calculations and computer simulations, Leiden astronomers seek to understand the origin,…
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Polar auxin transport: translating environmental signals into plant developmental responses
1. What is the exact role of PIN proteins in PAT? 2. How is PIN polarity established, and how is it modulated by AGC kinase-mediated phosphorylation? 3. What is the role of the AGC kinase, as modulators of PAT, in translating environmental signals, such as gravity, light or mechanical stress, to plant…
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Galaxies and the structures in which they are embedded
Researchers at Leiden Observatory study the fundamental physics that creates structure in the Universe. These processes collect matter into galaxies and gas into stars. With the use of powerful telescopes and advanced calculations and computer simulations, Leiden astronomers seek to understand the origin,…
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Shedding light on the dark side of the universe
It must be there. We just cannot see it: mysterious dark matter and dark energy in the universe. Henk Hoekstra is one of the many cosmologists who would love to know what exactly these substances consist of. He has received a European research grant of 1.3 euro million to find out.
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Galaxy without dark matter discovered
Astronomers led by Pieter van Dokkum have discovered a galaxy that barely contains any dark matter, which actually proves that dark matter does indeed exist. The research results will be published this week in Nature.
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Leiden physics acquires original Horndeski
The Leiden physics institute LION has bought a painting by the American physicist Gregory Horndeski, who wrote a brilliant article about gravity in 1974. After being ignored for 35 years, Horndeski's paper became a huge hit among cosmologists, unbeknownst to Horndeski himself, who had made a career…
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Youtube star Ed Copeland gives Colloquium Ehrenfestii
On Wednesday February 7th, Professor Ed Copeland from the University of Nottingham will give the Colloquium Ehrenfestii.
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Weighing heavenly bodies based on bending light
Many astronomers suspect that most of the matter in the universe is invisible. So how can you weigh dark matter if you can't actually see it? Professor Henk Hoekstra is looking for a solution. Inaugural lecture 25 June.
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Direct relationship between depression and inflammation called into question
Depression has traditionally been linked to increased inflammation. Innovative research by psychologist Eiko Fried refutes this popular assumption. He shows that specific depression symptoms such as sleeping problems explain this relationship. Publication in Psychological Medicine .
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New flowchart to eliminate Universe models
Cosmologists have many possible models for the Universe, of which only one can be true. A new flowchart will eliminate some of them when two specific Universe features are accurately measured. Publication in Physical Review D on 7 November.
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Scholarly temptations: self-discipline and desire in Victorian Britain.
How did British scholars and scientists in the period of discipline formation envision, experience and resist scholarly temptations?
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Thinking about the quantum internet
Quantum computers deserve their own quantum internet. This is a network that dispatches information not in the form of bits - ones and zeros - but rather as qubits, just like in the quantum computer itself. In the view of Dirk Bouwmeester, a professor in Leiden’s Quantum Matter & Optics research group,…
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Astronaut André Kuipers touches down at Leiden University
In his guest lecture on 22 January André Kuipers took school pupils and students on trip through space. His mission was to interest his young listeners in science and technology.
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This is how ESA telescope Euclid is going to visualise dark matter
How can you see something that’s invisible? Well, with Euclid! This future ESA telescope will map the structure of the Universe and teach us more about invisible dark matter and dark energy. Scientific coordinator of Euclid and Leiden astronomer Henk Hoekstra explains how this works.
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New KiDS result: Universe 10 per cent more homogeneous than assumed
New results from the Kilo-Degree Survey (KiDS) show that the Universe is almost 10 percent more homogeneous than previously thought. The new KiDS map was created using the partly Dutch OmegaCAM on ESO's VLT Survey Telescope on Cerro Paranal in Northern Chile. An international team of astronomers from,…