High Energy Physics

Displaying 1861 - 1872 of 3066

Quantum Field Theory - Lecture 11A

Konstantin Zarembo Nordic Institute for Theoretical Physics
October 23, 2012

PIRSA:12100018
High Energy Physics
Photons and Quantum Gravity in Astrophysics
- Robert Nemiroff Michigan Technological University
- Giovanni Amelino-Camelia Sapienza Università di Roma - Dipartimento di Fisica
- Niayesh Afshordi University of Waterloo
- Joao Magueijo Imperial College London
- Alfio Bonanno National Institute for Astrophysics (INAF)
- Robert Brandenberger McGill University - Department of Physics
October 22, 2012

PIRSA:12100085
General Relativity & Quantum Cosmology

High Energy Physics
Quantum Field Theory - Lecture 10B

Konstantin Zarembo Nordic Institute for Theoretical Physics
October 22, 2012

PIRSA:12100071
High Energy Physics
Quantum Field Theory - Lecture 10A

Konstantin Zarembo Nordic Institute for Theoretical Physics
October 22, 2012

PIRSA:12100017
High Energy Physics
Quantum Field Theory - Lecture 9B

Konstantin Zarembo Nordic Institute for Theoretical Physics
October 19, 2012

PIRSA:12100070
High Energy Physics
Quantum Field Theory - Lecture 9A

Konstantin Zarembo Nordic Institute for Theoretical Physics
October 19, 2012

PIRSA:12100014
High Energy Physics
Towards an Asymptotically AdS Description of Heavy Ion Collisions

Hans Bantilan Princeton University
October 18, 2012

PIRSA:12100076
High Energy Physics
Quantum Field Theory - Lecture 8B

Konstantin Zarembo Nordic Institute for Theoretical Physics
October 18, 2012

PIRSA:12100069
High Energy Physics
Quantum Field Theory - Lecture 8A

Konstantin Zarembo Nordic Institute for Theoretical Physics
October 18, 2012

PIRSA:12100013
High Energy Physics
Quantum Field Theory - Lecture 7B

Konstantin Zarembo Nordic Institute for Theoretical Physics
October 17, 2012

PIRSA:12100068
High Energy Physics
Quantum Field Theory - Lecture 7A

Konstantin Zarembo Nordic Institute for Theoretical Physics
October 17, 2012

PIRSA:12100012
High Energy Physics
Constraining RG flow in three-dimensional field theory

Benjamin Safdi Massachusetts Institute of Technology (MIT)
October 16, 2012

PIRSA:12100054
High Energy Physics

Quantum Field Theory - Lecture 11A

Konstantin Zarembo Nordic Institute for Theoretical Physics
October 23, 2012

PIRSA:12100018
High Energy Physics
Photons and Quantum Gravity in Astrophysics
- Robert Nemiroff Michigan Technological University
- Giovanni Amelino-Camelia Sapienza Università di Roma - Dipartimento di Fisica
- Niayesh Afshordi University of Waterloo
- Joao Magueijo Imperial College London
- Alfio Bonanno National Institute for Astrophysics (INAF)
- Robert Brandenberger McGill University - Department of Physics
October 22, 2012

PIRSA:12100085
General Relativity & Quantum Cosmology

High Energy Physics
Asymptotically safe inflation and CMB polarization
The presence of complex critical exponents in the scaling behavior of the Newton constant and Cosmological constant has dramatic consequences at the inflation scale. In particular an infinite number of unstable de-Sitter vacua emerges from an effective quantum gravitational action. In this framework, the possibility of detecting specific signaturesof a non-gaussian fixed point of the gravitational interactions in the CMB polarization spectrum will then be discussed.

________________________

Cosmological windows such as CMB polarization and 21cm redshift surveys to probe Planck-scale physics

________________________

Quantum gravity and a chiral signature in gravity waves
I show how quantum gravity could lead to a chiral signature in the graviational wave background, proportional to the imaginary part of the Immirzi parameter. This would leave a distinctive imprint in the polarization of the cosmic microwave background. I will discuss how this isue is closely related to that of identifying the ground of base state for quantum gravity.

_______________________

A Possible Bound on Spectral Dispersion from Fermi-Detected Gamma Ray Burst 090510A
Three photons spanning about 30 GeV arrived within about one millisecond from the Fermi-detected GRB 090510A at a redshift of about 0.9. Although conceivably a > 3Ïƒ statistical fluctuation when taken at face value this photon bunch -- quite possibly a classic GRB pulse -- leads to a relatively tight bound on the ability of our universe to disperse high energy photons. Specifically given a generic dispersion relation where the time delay is proportional to the photon energy to the first power the limit on the dispersion strength is k1 < 1.61Ã—10-5 sec Gpc-1 GeV-1. In the context of some theories of quantum gravity this conservative bound translates into an minimum energy scale greater than 525 m_Planck suggesting that spacetime is smooth at energies perhaps three orders of magnitude over the Planck mass.
Quantum Field Theory - Lecture 10B

Konstantin Zarembo Nordic Institute for Theoretical Physics
October 22, 2012

PIRSA:12100071
High Energy Physics
Quantum Field Theory - Lecture 10A

Konstantin Zarembo Nordic Institute for Theoretical Physics
October 22, 2012

PIRSA:12100017
High Energy Physics
Quantum Field Theory - Lecture 9B

Konstantin Zarembo Nordic Institute for Theoretical Physics
October 19, 2012

PIRSA:12100070
High Energy Physics
Quantum Field Theory - Lecture 9A

Konstantin Zarembo Nordic Institute for Theoretical Physics
October 19, 2012

PIRSA:12100014
High Energy Physics
Towards an Asymptotically AdS Description of Heavy Ion Collisions

Hans Bantilan Princeton University
October 18, 2012

PIRSA:12100076
High Energy Physics
I will discuss recent work in simulating asymptotically anti-de Sitter spacetimes, and its relation to heavy ion collider physics. For this purpose, I intend to focus on a class of oblately deformed black hole spacetime solutions. For each of these solutions, I will map the gravitational metric in the spacetime bulk to a stress tensor one-point function of the conformal field theory defined on the spacetime boundary. During the ring-down process, wherein the deformed black hole settles down to the AdS analog of the Schwarzschild solution, I will exhibit evidence that the dual CFT stress tensor on the boundary is that of an N=4 SYM fluid, even for black holes of significant deformation well outside the perturbative regime. We will conformally map the boundary fluid onto a real-world fluid in Minkowski space, and discover a temperature profile which can be thought of as approximating that of a head-on heavy ion collision at its moment of impact. I will close with a description of recent parallel explorations.
Quantum Field Theory - Lecture 8B

Konstantin Zarembo Nordic Institute for Theoretical Physics
October 18, 2012

PIRSA:12100069
High Energy Physics
Quantum Field Theory - Lecture 8A

Konstantin Zarembo Nordic Institute for Theoretical Physics
October 18, 2012

PIRSA:12100013
High Energy Physics
Quantum Field Theory - Lecture 7B

Konstantin Zarembo Nordic Institute for Theoretical Physics
October 17, 2012

PIRSA:12100068
High Energy Physics
Quantum Field Theory - Lecture 7A

Konstantin Zarembo Nordic Institute for Theoretical Physics
October 17, 2012

PIRSA:12100012
High Energy Physics
Constraining RG flow in three-dimensional field theory

Benjamin Safdi Massachusetts Institute of Technology (MIT)
October 16, 2012

PIRSA:12100054
High Energy Physics
The entanglement entropy S(R) across a circle of radius R has been invoked recently in deriving general constraints on renormalization group flow in three-dimensional field theory. At conformal fixed points, the negative of the finite part of the entanglement entropy, which is called F, is equal to the free energy on the round three-sphere. The F-theorem states that F decreases under RG flow. Along the RG flow it has recently been shown that the renormalized entanglement entropy {\cal F}(R) = -S(R) + R S'(R), which is equal to F at the fixed points, is a monotonically decreasing function. I will review various three-dimensional field theories where we can calculate F on the three-sphere and compute its change under RG flow, including free field theories, perturbative fixed points, large N field theories with double trace deformations, gauge theories with large numbers of flavors, and supersymmetric theories with at least {\cal N} = 2 supersymmetry. I will also present calculations of the renormalized entanglement entropy along the RG flow in free massive field theory and in holographic examples.

Title	Speaker(s)	Date	Talk Type	Info link
Quantum Field Theory - Lecture 11A	Konstantin Zarembo	2012-10-23	Course	View details
Photons and Quantum Gravity in Astrophysics	Robert Nemiroff, Giovanni Amelino-Camelia, Niayesh Afshordi, Joao Magueijo, Alfio Bonanno, Robert Brandenberger	2012-10-22	Conference	View details
Quantum Field Theory - Lecture 10B	Konstantin Zarembo	2012-10-22	Course	View details
Quantum Field Theory - Lecture 10A	Konstantin Zarembo	2012-10-22	Course	View details
Quantum Field Theory - Lecture 9B	Konstantin Zarembo	2012-10-19	Course	View details
Quantum Field Theory - Lecture 9A	Konstantin Zarembo	2012-10-19	Course	View details
Towards an Asymptotically AdS Description of Heavy Ion Collisions	Hans Bantilan	2012-10-18	Scientific Series	View details
Quantum Field Theory - Lecture 8B	Konstantin Zarembo	2012-10-18	Course	View details
Quantum Field Theory - Lecture 8A	Konstantin Zarembo	2012-10-18	Course	View details
Quantum Field Theory - Lecture 7B	Konstantin Zarembo	2012-10-17	Course	View details
Quantum Field Theory - Lecture 7A	Konstantin Zarembo	2012-10-17	Course	View details
Constraining RG flow in three-dimensional field theory	Benjamin Safdi	2012-10-16	Scientific Series	View details

Supported by

High Energy Physics

Format results

Quantum Field Theory - Lecture 11A

Photons and Quantum Gravity in Astrophysics

Quantum Field Theory - Lecture 10B

Quantum Field Theory - Lecture 10A

Quantum Field Theory - Lecture 9B

Quantum Field Theory - Lecture 9A

Towards an Asymptotically AdS Description of Heavy Ion Collisions

Quantum Field Theory - Lecture 8B

Quantum Field Theory - Lecture 8A

Quantum Field Theory - Lecture 7B

Quantum Field Theory - Lecture 7A

Constraining RG flow in three-dimensional field theory

Quantum Field Theory - Lecture 11A

Photons and Quantum Gravity in Astrophysics

Quantum Field Theory - Lecture 10B

Quantum Field Theory - Lecture 10A

Quantum Field Theory - Lecture 9B

Quantum Field Theory - Lecture 9A

Towards an Asymptotically AdS Description of Heavy Ion Collisions

Quantum Field Theory - Lecture 8B

Quantum Field Theory - Lecture 8A

Quantum Field Theory - Lecture 7B

Quantum Field Theory - Lecture 7A

Constraining RG flow in three-dimensional field theory