Particle physics is the science which identifies nature's constituents and interactions at the most fundamental level, with an emphasis on comparing theoretical ideas with both terrestrial experiments and astrophysical observations. This mandate gives it a strong overlap with string theory, quantum gravity and cosmology. Particle physicists at Perimeter Institute are currently involved in identifying how cosmological observations and terrestrial accelerator and underground experiments constrain the theoretical possibilities for physics beyond the Standard Model.
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Dark matter and dark energy - Fact or fiction?
Philip Mannheim - University of Connecticut
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Topological preon models: a braid new world
Sundance Bilson-Thompson - University of Adelaide
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The problem of vacuum energy from a particle physics perspective
Alexander Dolgov - National Institute for Nuclear Physics
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A particle physicist's perspective on dark matter
Michael Peskin - Stanford University
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QCD and a Holographic Model of Hadrons
Dam Thanh Son - University of Chicago
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Dynamics of Extra Dimensions
Marco Peloso - University of Minnesota
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Quantum gravity at astrophysical distances
Martin Reuter - Johannes Gutenberg University Mainz
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Challenging the Alternative Perspectives in Dark Energy
Rachel Bean - Cornell University
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Particle physics in canada: present and future
William Trischuk - University of Toronto
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Dark matter and dark energy - Fact or fiction?
Philip Mannheim - University of Connecticut
We show that the origin of the dark matter and dark energy problems originates in the assumption of standard Einstein gravity that Newton's constant is fundamental. We discuss an alternate, conformal invariant, metric theory of gravity in which Newton's constant is induced dynamically, with the… -
Topological preon models: a braid new world
Sundance Bilson-Thompson - University of Adelaide
Preon models enjoyed considerable popularity during the early 1980s, but have seen little progress since then. I will describe a correspondence between one of the more successful preon models and a simple game involving the twisting and braiding of ribbons, subject to straightforward topological… -
The problem of vacuum energy from a particle physics perspective
Alexander Dolgov - National Institute for Nuclear Physics
The problem of vacuum energy is reviewed. The observational evidence in favor of a non-zero cosmological constant is described. I then discuss several possible explanations for how a theoretically natural huge value of vacuum energy could be adjusted down to the unnaturally tiny but observed value. -
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Dynamics of Extra Dimensions
Marco Peloso - University of Minnesota
A key issue in the context of (compact) extra dimensions is the one of their stability. Any stabilization mechanism is effective only up to some given energy scale; if they can approach this energy, 4$d observers can excite the fluctuations of the internal space, and probe its existence… -
The neutrino matrix & beyond
Since the seminal discovery of the neutrino by Cowan and Reines in the late 1950's, intense experimental and theoretical effort has focused on the elucidation of neutrino properties and the role they play in elementary particle physics, astrophysics, and cosmology. Neutrinos are born in the fusion… -
Quantum gravity at astrophysical distances
Martin Reuter - Johannes Gutenberg University Mainz
In this talk we assume that Quantum Einstein Gravity (QEG) is the correct theory of gravity on all length scales. We use both analytical results from nonperturbative renormalization group (RG) equations and experimental input in order to describe the special RG trajectory of QEG which is realized in… -
Challenging the Alternative Perspectives in Dark Energy
Rachel Bean - Cornell University
The existence, and enigmatic nature, of 'Dark Energy' is one of the biggest theoretical upsets of recent times. In this seminar we present ideas on alternative theoretical and phenomenological approaches to the Dark Energy problem, in particular the issue of whether dark energy is a matter or… -