Talks

11533 - 11544 of 20132 Results

Axions: Past, Present and Future

Surjeet Rajendran Stanford University

June 18, 2014

PIRSA:14060025
Inflationary Gravitational Waves: Recent Developments and Next Steps

Marc Kamionkowski Johns Hopkins University - Department of Physics & Astronomy

June 18, 2014

PIRSA:14060024
Precision Spectroscopy of Atomic Lithium

Jason Stalnaker Oberlin College

June 17, 2014

PIRSA:14060022
A quantum network of clocks

Mikhail Lukin Harvard University

June 17, 2014

PIRSA:14060021
Dark Energy and Testing Gravity

Raman Sundrum University of Maryland, College Park

June 17, 2014

PIRSA:14060020
New methods for detecting short-range forces and gravitational waves using resonant sensors

Andrew Geraci University of Nevada Reno

June 17, 2014

PIRSA:14060019
The Exact Renormalization Group and Higher Spin Holography.

Rob Leigh University of Illinois Urbana-Champaign

June 17, 2014

PIRSA:14060047

High Energy Physics
Probing Gravity and Small Forces with Torsion Balances

Blayne Heckel University of Washington

June 17, 2014

PIRSA:14060018
Resonant Detection of Short-Range Gravitational Forces

Eli Levenson-Falk University of Southern California

June 17, 2014

PIRSA:14060046
f(R) Gravity and Cosmology

Valerio Faraoni Bishop's University

June 17, 2014

PIRSA:14060045
Fundamental physics with atom interferometry

Jason Hogan Stanford Law School - The Bill Lane Centre for the American West

June 17, 2014

PIRSA:14060016
Precision gravity measurements with cold atom interferometry

Guglielmo Tino National Institute for Nuclear Physics

June 17, 2014

PIRSA:14060015

Axions: Past, Present and Future

Surjeet Rajendran Stanford University

June 18, 2014

PIRSA:14060025

I will review the theoretical motivations for axion and axion-like-particles. I will then discuss bounds on such particles and highlight ways to experimentally probe them.
Inflationary Gravitational Waves: Recent Developments and Next Steps

Marc Kamionkowski Johns Hopkins University - Department of Physics & Astronomy

June 18, 2014

PIRSA:14060024

The recently reported evidence for the cosmic microwave background signature of inflationary gravitational waves is very tantalizing. I will discuss how the measurement is done, the evidence presented by BICEP2, the interpretation, and some of the criticisms of the arguments presented by BICEP2 that the signal is not dust-dominated. I will then review next steps to be taken with future CMB experiments and with galaxy surveys.
Precision Spectroscopy of Atomic Lithium

Jason Stalnaker Oberlin College

June 17, 2014

PIRSA:14060022

The simplicity of the atomic structure of lithium has long made it a system of theoretical interest. With the development of stabilized optical frequency combs, it is possible to achieve experimental accuracies that provide significant tests of atomic theory calculations as well as a window into nuclear structure. I will discuss an ongoing experimental effort at Oberlin College to measure the energy levels of lithium using a stabilized optical frequency comb.
A quantum network of clocks

Mikhail Lukin Harvard University

June 17, 2014

PIRSA:14060021

By combining precision metrology and quantum networks, we describe a quantum, cooperative protocol for the operation of a network consisting of geographically remote optical atomic clocks. Using non-local entangled states, we demonstrate an optimal utilization of the global network resources, and show that such a network can be operated near the fundamental limit set by quantum theory yielding an ultra-precise clock signal. Besides serving as a real-time clock for the international time scale, the proposed quantum network also represents a large-scale quantum sensor that can be used to probe the fundamen- tal laws of physics, including relativity and connections between space-time and quantum physics. Prospects for realization of such networks will be discussed.
Dark Energy and Testing Gravity

Raman Sundrum University of Maryland, College Park

June 17, 2014

PIRSA:14060020

I will review why the mild acceleration of the Universe poses a major puzzle, the Cosmological Constant Problem, for the connection between gravity and matter, suggesting a possible breakdown in the standard general relativistic and field theoretic description. Thus far theorists have failed to provide any very concrete and testable resolution. I will however discuss some simple theoretical ideas that suggest directions for experiments to lead the way.
New methods for detecting short-range forces and gravitational waves using resonant sensors

Andrew Geraci University of Nevada Reno

June 17, 2014

PIRSA:14060019

High-Q resonant sensors enable ultra-sensitive force and field detection. In this talk I will describe three applications of these sensors in searches for new physics. First I will discuss our experiment which uses laser-cooled optically trapped silica microspheres to search for violations of the gravitational inverse square law at micron distances [1]. I will explain how similar sensors could be used for gravitational wave detection at high frequencies [2]. Finally I will describe a new method for detecting short-range spin-dependent forces from axion-like particles based on nuclear magnetic resonance in hyperpolarized Helium-3. The method can potentially improve previous experimental bounds by several orders of magnitude and can probe deep into the theoretically interesting regime for the QCD axion [3]. [1] A.Geraci, S. Papp, and J. Kitching, Phys. Rev. Lett. 105, 101101 (2010), [2] A. Arvanitaki and A. Geraci, Phys. Rev. Lett. 110, 071105 (2013), [3] A. Arvanitaki and A. Geraci, arxiv: 1403.1290 (2014).
The Exact Renormalization Group and Higher Spin Holography.

Rob Leigh University of Illinois Urbana-Champaign

June 17, 2014

PIRSA:14060047

High Energy Physics
Probing Gravity and Small Forces with Torsion Balances

Blayne Heckel University of Washington

June 17, 2014

PIRSA:14060018

The EotWash group at the University of Washington has developed a set of torsion balance
instruments to probe the properties of gravity and to search for new weak forces. Current efforts
focus on improved tests of the principle of equivalence, the inverse square law at short distances,
and spin-coupled interactions. These experiments and prospects for the future will be discussed.
Resonant Detection of Short-Range Gravitational Forces

Eli Levenson-Falk University of Southern California

June 17, 2014

PIRSA:14060046

Some theories predict a short-range component to the gravitational force, typically modeled as a Yukawa modification of the gravitational potential. This force is usually detected by measuring the motion of a mechanical oscillator driven by an external mass. In this talk I will discuss such an apparatus optimized for use in the 10-100 micron distance range. The setup consists of a cantilever-style silicon nitride oscillator suspended above a rotating drive mass. Periodic density variations in the drive mass cause an oscillatory gravitational force on the cantilever, whose position is read out using optical interferometry. In order to drive the cantilever precisely on resonance, it must have a broad resonant peak; however, lower quality factors reduce force sensitivity by reducing the amplitude of oscillation for a given drive force. We solve this problem by implementing an effective damping on the oscillator by use of optical feedback. I will discuss further applications of this feedback technique, as well as improvements to the apparatus and future experiments.
f(R) Gravity and Cosmology

Valerio Faraoni Bishop's University

June 17, 2014

PIRSA:14060045

A popular alternative to dark energy in explaining the current acceleration of the universe discovered with type Ia supernovae is modifying gravity at cosmological scales. But this is risky: even when everything is well for cosmology, other fundamental and experimental aspects of gravity must be checked in order for the theory to be viable. The successes of modified gravity and its challenges, which have generated a large body of literature in the past ten years, will be reviewed.
Fundamental physics with atom interferometry

Jason Hogan Stanford Law School - The Bill Lane Centre for the American West

June 17, 2014

PIRSA:14060016

Precision atom interferometry is poised to become a powerful tool for discovery in fundamental physics. Towards this end, I will describe recent, record-breaking atom interferometry experiments performed in a 10 meter drop tower that demonstrate long-lived quantum superposition states with macroscopic spatial separations. The potential of this type of sensor is only beginning to be realized, and the ongoing march toward higher sensitivity will enable a diverse science impact, including new limits on the equivalence principle, probes of quantum mechanics, and detection of gravitational waves. Gravitational wave astronomy is particularly compelling since it opens up a new window into the universe, collecting information about astrophysical systems and cosmology that is difficult or impossible to acquire by other methods. Atom interferometric gravitational wave detection offers a number of advantages over traditional approaches, including simplified detector geometries, access to conventionally inaccessible frequency ranges, and substantially reduced antenna baselines.
Precision gravity measurements with cold atom interferometry

Guglielmo Tino National Institute for Nuclear Physics

June 17, 2014

PIRSA:14060015

I will discuss experiments we are conducting for precision tests of gravitational physics using cold atom interferometry. In particular, I will report on the measurement of the gravitational constant G with a Rb Raman interferometer, and on experiments based on Bloch oscillations of Sr atoms confined in an optical lattice for gravity measurements at small spatial scales and for testing Einstein equivalence principle.

Title	Date	Collection	Type	Info
Axions: Past, Present and Future	2014‑06‑18	New ideas in low-energy tests of fundamental physics	Conference	View details
Inflationary Gravitational Waves: Recent Developments and Next Steps	2014‑06‑18	New ideas in low-energy tests of fundamental physics	Conference	View details
Precision Spectroscopy of Atomic Lithium	2014‑06‑17	New ideas in low-energy tests of fundamental physics	Conference	View details
A quantum network of clocks	2014‑06‑17	New ideas in low-energy tests of fundamental physics	Conference	View details
Dark Energy and Testing Gravity	2014‑06‑17	New ideas in low-energy tests of fundamental physics	Conference	View details
New methods for detecting short-range forces and gravitational waves using resonant sensors	2014‑06‑17	New ideas in low-energy tests of fundamental physics	Conference	View details
The Exact Renormalization Group and Higher Spin Holography.	2014‑06‑17	Quantum Fields and Strings	Scientific Series	View details
Probing Gravity and Small Forces with Torsion Balances	2014‑06‑17	New ideas in low-energy tests of fundamental physics	Conference	View details
Resonant Detection of Short-Range Gravitational Forces	2014‑06‑17	New ideas in low-energy tests of fundamental physics	Conference	View details
f(R) Gravity and Cosmology	2014‑06‑17	New ideas in low-energy tests of fundamental physics	Conference	View details
Fundamental physics with atom interferometry	2014‑06‑17	New ideas in low-energy tests of fundamental physics	Conference	View details
Precision gravity measurements with cold atom interferometry	2014‑06‑17	New ideas in low-energy tests of fundamental physics	Conference	View details

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Format results

Axions: Past, Present and Future

Inflationary Gravitational Waves: Recent Developments and Next Steps

Precision Spectroscopy of Atomic Lithium

A quantum network of clocks

Dark Energy and Testing Gravity

New methods for detecting short-range forces and gravitational waves using resonant sensors

The Exact Renormalization Group and Higher Spin Holography.

Probing Gravity and Small Forces with Torsion Balances

Resonant Detection of Short-Range Gravitational Forces

f(R) Gravity and Cosmology

Fundamental physics with atom interferometry

Precision gravity measurements with cold atom interferometry

Axions: Past, Present and Future

Inflationary Gravitational Waves: Recent Developments and Next Steps

Precision Spectroscopy of Atomic Lithium

A quantum network of clocks

Dark Energy and Testing Gravity

New methods for detecting short-range forces and gravitational waves using resonant sensors

The Exact Renormalization Group and Higher Spin Holography.

Probing Gravity and Small Forces with Torsion Balances

Resonant Detection of Short-Range Gravitational Forces

f(R) Gravity and Cosmology

Fundamental physics with atom interferometry

Precision gravity measurements with cold atom interferometry