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Numerical investigations of singularities in general relativity

David Garfinkle Oakland University
June 26, 2014

PIRSA:14060052
Astrophysics
On Quantum Tunnelling

Neil Turok University of Edinburgh
June 25, 2014

PIRSA:14060051
Astrophysics
PSI Ceremony 2014
- John Berlinsky McMaster University
- James Forrest University of Waterloo
June 21, 2014

PIRSA:14060054
Free Discussion

June 19, 2014

PIRSA:14060038
Summary

Derek Jackson Kimball California State University, East Bay

June 19, 2014

PIRSA:14060037
Gravity, an unexpected journey: from thermodynamics to emergent gravity, Lorentz breaking and back...

Stefano Liberati SISSA International School for Advanced Studies
June 19, 2014

PIRSA:14060002
General Relativity & Quantum Cosmology
Probing the electron-proton mass ratio variation with AMO systems

Robin Cote University of Connecticut

June 19, 2014

PIRSA:14060050
Atomic magnetometers for precision measurements

Mike Romalis Princeton University

June 19, 2014

PIRSA:14060034
Nuclear spin precession of noble gases in ultra low magnetic fields

Lutz Trahms Physikalisch-Technische Bundesanstalt (PTB)

June 19, 2014

PIRSA:14060033
Optical magnetometry - From basics to Global Network of Optical Magnetometer for Exotic physics
- Nathan Leefer University of California System
- Szymon Pustelny University of California, Berkeley
June 19, 2014

PIRSA:14060032
Free Discussion

June 18, 2014

PIRSA:14060031
Search for new physics in atoms: cosmic PNC and variation of alpha

Vladimir Dzuba University of New South Wales (UNSW)

June 18, 2014

PIRSA:14060030

Numerical investigations of singularities in general relativity

David Garfinkle Oakland University
June 26, 2014

PIRSA:14060052
Astrophysics
The singularity theorems of general relativity tell us that spacetime singularities form in gravitational collapse, but tell us very little about the precise nature of these singularities. More information can be found using analytic approximations and numerical simulations. It is conjectured that inside black holes are two types of singularities: one that is spacelike, local, and oscillatory, and the other that is null and weak. This talk will review what numerical simulations of singularities have been done and the extent to which the above conjecture has been verified by the simulations.
On Quantum Tunnelling

Neil Turok University of Edinburgh
June 25, 2014

PIRSA:14060051
Astrophysics
One of the most basic but intriguing properties of quantum systems is their ability to `tunnel' between configurations which are classically disconnected. That is, processes which are classically impossible, are quantum allowed. In this talk I will outline a new, first-principles approach combining the semiclassical approximation with the concepts of post-selection and weak measurement. Its main virtue is to provide a real-time description within which sharp answers can be given to questions such as 'how long did the tunneling take' and 'where was the particle while it was tunneling?' Potential applications span a vast range, from laboratory tests to understanding black hole evaporation, the stability of the electroweak Higgs vacuum and the future of our universe, and the validity (or otherwise) of the "inflationary multiverse" scenario.
PSI Ceremony 2014
- John Berlinsky McMaster University
- James Forrest University of Waterloo
June 21, 2014

PIRSA:14060054
Free Discussion

June 19, 2014

PIRSA:14060038
Summary

Derek Jackson Kimball California State University, East Bay

June 19, 2014

PIRSA:14060037
Gravity, an unexpected journey: from thermodynamics to emergent gravity, Lorentz breaking and back...

Stefano Liberati SISSA International School for Advanced Studies
June 19, 2014

PIRSA:14060002
General Relativity & Quantum Cosmology
Thermodynamical aspects of gravity have been a tantalising puzzle for more than forty years now and are still at the center of much activity in semiclassical and quantum gravity. We shall explore the possibility that they might hint toward an emergent nature of gravity exploring the possible implications of such hypothesis. Among these we shall focus on the possibility that Lorentz invariance might be only a low energy/emergent feature by discussing viable theoretical frameworks, present constraints and open issues which make this path problematic. In the end we shall focus on black hole thermodynamics in Lorentz breaking gravity by presenting some recent results that seems to hint towards a surprising resilience of thermodynamics aspect of gravity even in these scenarios.
Probing the electron-proton mass ratio variation with AMO systems

Robin Cote University of Connecticut

June 19, 2014

PIRSA:14060050
Atomic magnetometers for precision measurements

Mike Romalis Princeton University

June 19, 2014

PIRSA:14060034

Atomic magnetometers have a long history in tests of Standard Model since they provide sensitive constraints on new spin interactions. I will review recent progress in magnetometry using electron and nuclear spins, describe some of the limits set on new physics and discuss ideas for future experiments.
Nuclear spin precession of noble gases in ultra low magnetic fields

Lutz Trahms Physikalisch-Technische Bundesanstalt (PTB)

June 19, 2014

PIRSA:14060033

In the low energy re¬gime, precision measurements of spin precession have gained increased attention as an alternative pathway to physics beyond the standard model. These measurements aim at the detection of minute frequency changes superimposed on low Larmor frequencies at extremely weak magnetic fields. Such measurements require an effective shielding against the magnetic field of the Earth and other perturbations. For measuring the precession frequency with high precision, a long lifetime of the precessing nuclear magnetization is required, thus the homogeneity of the applied field is a crucial parameter. In addition, criteria are needed that unambiguously distinguish magnetic artifacts from the non-magnetic exotic interactions that we search for. This can be accomplished by the concept of co-magnetometry, i.e., by simultaneous measuring the precession of two nuclear species such as 3He and 129Xe. Yet another kind of co-magnetometry is the use of SQUIDs for monitoring the spin precession. SQUIDs are magnetic field detectors of their own kind, which can measure the oscillating magnetic field generated by the precessing nuclear magnetic moment as well as the magnetic dc background field. In this presentation, I will report on the current state of the art in our lab in measurements of nuclear spin precession of noble gases.
Optical magnetometry - From basics to Global Network of Optical Magnetometer for Exotic physics
- Nathan Leefer University of California System
- Szymon Pustelny University of California, Berkeley
June 19, 2014

PIRSA:14060032

In our talk we seek to present a broad overview of the field of optical magnetometers, starting from basic principles to fundamental limitations to the variety of applications in which they have already found use. We will end with a report on the development of a new worldwide network of synchronized magnetometers that can be used to search for a variety of new physical phenomena (many of which are discussed at this conference!).
Free Discussion

June 18, 2014

PIRSA:14060031
Search for new physics in atoms: cosmic PNC and variation of alpha

Vladimir Dzuba University of New South Wales (UNSW)

June 18, 2014

PIRSA:14060030

We consider pseudo-scalar and pseudo-vector interaction of atomic electrons with hypothetical dark matter particles (e.g., axions). These interactions lead to oscillating atomic parity non-conserving (PNC) amplitudes and/or oscillating electric dipole moments (EDM). In static
limit for PNC, existing atomic PNC experiments can be used to constrain time component of the pseudo-vector field.

Possible variation of fundamental constants is suggested by theories unifying gravity with other interactions. Evidence of the space/time variation of the fine structure constant alpha is found in
the quasar absorption spectra. Optical transitions in highly charged ions can be used as sensitive tools for studying time variation of alpha in laboratory.

Title	Date	Collection	Type	Info
Numerical investigations of singularities in general relativity	2014‑06‑26	Cosmology and Gravitation	Scientific Series	View details
On Quantum Tunnelling	2014‑06‑25	Colloquium	Scientific Series	View details
PSI Ceremony 2014	2014‑06‑21		Other	View details
Free Discussion	2014‑06‑19	New ideas in low-energy tests of fundamental physics	Conference	View details
Summary	2014‑06‑19	New ideas in low-energy tests of fundamental physics	Conference	View details
Gravity, an unexpected journey: from thermodynamics to emergent gravity, Lorentz breaking and back...	2014‑06‑19	Quantum Gravity	Scientific Series	View details
Probing the electron-proton mass ratio variation with AMO systems	2014‑06‑19	New ideas in low-energy tests of fundamental physics	Other	View details
Atomic magnetometers for precision measurements	2014‑06‑19	New ideas in low-energy tests of fundamental physics	Conference	View details
Nuclear spin precession of noble gases in ultra low magnetic fields	2014‑06‑19	New ideas in low-energy tests of fundamental physics	Conference	View details
Optical magnetometry - From basics to Global Network of Optical Magnetometer for Exotic physics	2014‑06‑19	New ideas in low-energy tests of fundamental physics	Conference	View details
Free Discussion	2014‑06‑18	New ideas in low-energy tests of fundamental physics	Conference	View details
Search for new physics in atoms: cosmic PNC and variation of alpha	2014‑06‑18	New ideas in low-energy tests of fundamental physics	Conference	View details

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Format results

Numerical investigations of singularities in general relativity

On Quantum Tunnelling

PSI Ceremony 2014

Free Discussion

Summary

Gravity, an unexpected journey: from thermodynamics to emergent gravity, Lorentz breaking and back...

Probing the electron-proton mass ratio variation with AMO systems

Atomic magnetometers for precision measurements

Nuclear spin precession of noble gases in ultra low magnetic fields

Optical magnetometry - From basics to Global Network of Optical Magnetometer for Exotic physics

Free Discussion

Search for new physics in atoms: cosmic PNC and variation of alpha

Numerical investigations of singularities in general relativity

On Quantum Tunnelling

PSI Ceremony 2014

Free Discussion

Summary

Gravity, an unexpected journey: from thermodynamics to emergent gravity, Lorentz breaking and back...

Probing the electron-proton mass ratio variation with AMO systems

Atomic magnetometers for precision measurements

Nuclear spin precession of noble gases in ultra low magnetic fields

Optical magnetometry - From basics to Global Network of Optical Magnetometer for Exotic physics

Free Discussion

Search for new physics in atoms: cosmic PNC and variation of alpha