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.
Format results

17 talksCollection Number C18012
Talk

Charting Fundamental Interactions
Francesco Sannino CP3Origins

Asymptotic safety with and without supersymmetry
Daniel Litim University of Sussex


Progress in constructing an Asymptotically safe Standard Model
Steven Abel Durham University

Cosmological nonConstant Problem
Niayesh Afshordi University of Waterloo


UVcomplete relativistic field theories and softened gravity
Alberto Salvio Scuola Normale Superiore di Pisa

Asymptotic safety of gravitymatter systems and effective universality
Manuel Reichert University of Southern Denmark


Open EFT's and Gravity as a Medium
Collection Number C18032 
Searching for New Particles with Black Hole Superradiance
11 talksCollection Number C18010Talk

Searching for Light Bosons with Black Hole Superradiance
Savas Dimopoulos Perimeter Institute for Theoretical Physics

Superradiant instabilities and rotating black holes
Sam Dolan University of Southampton
PIRSA:18050028 
Superradiant instabilities and rotating black holes
Avery Broderick University of Waterloo

Measuring StellarMass Black Hole Spins via Xray Spectroscopy
James Steiner Massachusetts Institute of Technology (MIT)

Superradiance Beyond the Linear Regime
Frans Pretorius Princeton University

Characterization of compact objects with present and future groundbased gravitationalwave detectors
Salvatore Vitale Massachusetts Institute of Technology (MIT)

LIGO and Virgo continuous wave searches  Overview and allsky searches
keith Riles University of Michigan–Ann Arbor

Directed and targeted searches for continuous gravitational waves
Sylvia Zhu Albert Einstein Institute


Experimental techniques in tabletop fundamental physics
24 talksCollection Number C17030Talk

Welcome and Opening Remarks
Asimina Arvanitaki Perimeter Institute for Theoretical Physics

Theory Talk
Asimina Arvanitaki Perimeter Institute for Theoretical Physics

A threedimensional optical lattice clock: precision at the 19th digit
Edward Marti University of Colorado Boulder

Measurement of the fine structure constant as a test of the standard model
Holger Mueller University of California, Berkeley

Superconducting accelerometer technology for precision tests of gravitation and search for new interactions
Ho Jung Paik University of Maryland, College Park

Searching for axions and new shortrange forces with resonant sensors
Andrew Geraci University of Nevada Reno

Testing Gravity at Extreme Scales
Giorgio Gratta Stanford University

Precision Physics in Storage Rings
Yannis Semertzidis Institute for Basic Science  Center for Axion and Precision Physics Research


New Directions in Dark Matter and Neutrino Physics
28 talksCollection Number C17026Talk


CRESST Detectors for Dark Matter and Neutrino Physics
Federica Petricca Max Planck Institute

Getting the Most out of Liquid Xenon
Rafael Lang Columbia University



Direct detection signals of light dark matter
Josef Pradler Institut für Hochenergiephysik (HEPHY)  Institut für Hochenergie Physik




Radiative Corrections at the Intensity Frontier of Particle Physics
12 talksCollection Number C17017Talk

Experimental Overview of lowenergy precision experiments
Doug Bryman TRIUMF (Canada's National Laboratory for Particle and Nuclear Physics)

Precision calculations for muonic bound states
Andrzej Czarnecki University of Alberta


SCET for precision physics at high and low energies
Thomas Becher Universität Bern

Higherorder corrections for neutrino experiments
Kevin Mcfarland University of Rochester

New physics searches in lowenergy experiments
Andre de Gouvea Northwestern University

Impact of neutrino interaction uncertainties
Kendall Mahn TRIUMF (Canada's National Laboratory for Particle and Nuclear Physics)

Simulation tools for neutrino experiments
Gabriel Perdue Fermi National Accelerator Laboratory (Fermilab)


2015 TriInstitute Summer School on Elementary Particles
46 talksCollection Number C15032Talk

The Standard Model – Theory: Electroweak Model
Michael Peskin SLAC National Accelerator Laboratory

Astroparticle Physics – Theory: WIMP Paradigm
Miriangela Lisanti Princeton University

The Standard Model – Theory: Parton Model
Michael Peskin SLAC National Accelerator Laboratory

Astroparticle Physics – Theory: Dark Matter Distribution in MW
Miriangela Lisanti Princeton University

The Standard Model – Theory: AltarelliParisi evolution
Michael Peskin SLAC National Accelerator Laboratory

Astroparticle Physics – Theory: Direct detection
Miriangela Lisanti Princeton University

The Standard Model – Theory: Events and processes @ the LHC
Michael Peskin SLAC National Accelerator Laboratory

Astroparticle Physics – Theory: Indirect detection
Miriangela Lisanti Princeton University


TRISEP
Collection Number C15015 
Preparing for the HighLuminosity Run of the LHC
Collection Number C15092 
Flux Tubes
Collection Number C15091 
Primordial Black Holes from Axion Domain Walls
David Dunsky New York University (NYU)

The Unruh effect and its connection to classical radiation (virtual)
Georgios Vacalis University of Oxford

Asymptotic Safety in a Dark Universe
17 talksCollection Number C18012The asymptotic safety paradigm is currently emerging as a highly promising idea for BeyondStandardModel physics with key progress in asymptotically safe quantum gravity and asymptotically safe matter models. The last years have seen not only the development of asymptotically safe gravitymatter models but also the discovery of asymptotically safe beyond Standard Model matter models that are under control in perturbation theory. New exciting avenues in (astro) particle physics are now waiting to be explored. For example although the nature of dark matter is a longstanding riddle it is a fact that experimental searches have so far not provided any direct clues but have instead come up with ever more stringent constraints on theoretically preferred regions of parameter space for darkmattermodels. Thus the key to unraveling this riddle could be a new theoretical paradigm to guide model builders. This workshop aims at exploring whether asymptotic safety can be a candidate for this new paradigm. We aim to bring together experts on phenomenological models and quantum gravity to probe both the theoretical viability and empirical signatures of asymptotically safe extensions of the standard model that include gravity. To facilitate a highly productive meeting that can trigger new collaborations each talk will be followed up by 1520 minutes discussion time. Further each day of the workshop will feature a dedicated discussion session. Participants will be encouraged to contribute questions for the discussion both before as well as during the workshop. The last day of the workshop will conclude with a roadmap discussion during which all participants will be given the opportunity to propose concrete suggestions for followup work that might lead into future joint projects.

Open EFT's and Gravity as a Medium
Collection Number C18032This event is meant to study the connections between quantum fields in curved spacetimes with horizons and the effective field theory methods as applied to open systems (Open EFTs). In particular the hope is to exploit the existence of tools (from areas like optics) for dealing with hierarchies of scale in open systems and adapt the to see if they can inform our understanding of controlling latetime predictions in gravitational environments. Please note that this meeting is by invitation only.

Searching for New Particles with Black Hole Superradiance
11 talksCollection Number C18010Black hole superradiance is a fascinating process in general relativity and a unique window on ultralight particles beyond the standard model. Bosons  such as axions and dark photons  with Compton wavelengths comparable to size of astrophysical black holes grow exponentially to form large clouds spinning down the black hole in the process and produce monochromatic continuous gravitational wave radiation. In the era of gravitational wave astronomy and increasingly sensitive observations of astrophysical black holes and their properties superradiance of new light particles is a promising avenue to search for new physics in regimes inaccessible to terrestrial experiments. This workshop will bring together theorists data analysts and observers in particle physics gravitational wave astronomy strong gravity and high energy astrophysics to explore the signatures of black hole superradiance and to study the current and future possibilities of searching for new particles with black holes.

Experimental techniques in tabletop fundamental physics
24 talksCollection Number C17030In the last few years there has been a resurgence of interest in small scale high sensitivity experiments that look for new forces and new particles beyond the Standard Model. They promise to expand our understanding of the Cosmos and possibly explain mysteries such as Dark matter in a way that is complementary to colliders and other large scale experiments. There is a number of different physics motivations and approaches currently being explored in many ongoing and newly proposed experiments and they often share common experimental techniques.Many workshops in this field focus on the theory motivations behind these experiments without emphasis on the details of the experimental techniques that enable precision measurements. There is also substantial experimental expertise across many fields, often outside of fundamental physics community, that can be relevant to ongoing and proposed experiments.Thus, we decided to organize the workshop around some of the common experimental techniques. We hope it will be educational for both experimentalists and theorists and lead to discussions on the best way forward. We would like to bring together experimentalists with different expertise in the hope that it will lead to new ideas through interdisciplinary interactions. For theorists, we expect it to provide better appreciation of the challenges and opportunities in improving the sensitivity of precision measurement experiments.

New Directions in Dark Matter and Neutrino Physics
28 talksCollection Number C17026Continuing investment in fundamental weaklycoupled science, primarily through neutrino experiments and dark matter searches, prompts the question: is the maximum possible scientific information going to be extracted from these experiments? Are there new creative uses of the existing and planned facilities that would advance our knowledge of fundamental physics? Are there physics targets that have been overlooked by the current approach? This workshop will attempt to advance discussion of these topics, and concentrate on nontraditional ideas and alternative methods of probing new physics, both at underground laboratories and at highintensity accelerators. The workshop aims to complement the large international conference, Topics in Astroparticle and Underground Physics 2017, to be held in Sudbury ON July 2428, by directly preceding that meeting.

Radiative Corrections at the Intensity Frontier of Particle Physics
12 talksCollection Number C17017Radiative Corrections at the Intensity Frontier of Particle Physics

2015 TriInstitute Summer School on Elementary Particles
46 talksCollection Number C150322015 TriInstitute Summer School on Elementary Particles 

Preparing for the HighLuminosity Run of the LHC
Collection Number C15092Preparing for the HighLuminosity Run of the LHC 

Primordial Black Holes from Axion Domain Walls
David Dunsky New York University (NYU)
Besides providing a possible explanation to the strong CP problem and dark matter, the QCD axion possesses a rich cosmology. For example, if PQ breaking occurs after inflation, then axion cosmic strings form. Near the QCD phase transition, every axion string become attached to a domain wall which pull on the strings and cause the stringwall network to decay. While every string becomes attached to a domain wall, it is possible, though rare, to form an enclosed domain wall that is not attached to any axion string. These enclosed domain walls collapse under their own self tension, compressing a large amount of energy into a small volume and thereby potentially forming a primordial black hole. In this talk, I will discuss the abundance of enclosed domain walls, their dynamics of collapse, the efficiency of black hole formation, and their relic abundance. For sufficiently large axion decay constants, there may be an observable gravitational lensing signal at future lensing telescopes, especially in models with axionlikeparticles.


The Unruh effect and its connection to classical radiation (virtual)
Georgios Vacalis University of Oxford
Particle production can occur in a curved spacetime like, for example, in the case of thermal emission of particles from black holes, otherwise known as Hawking radiation. The Unruh effect is a quantum field theory result that is closely connected to Hawking radiation. It states that accelerated observers associate a thermal bath of particles to the vacuum state of inertial observers. The Unruh effect has been given special attention because contrary to black hole evaporation, it is a prediction made in a flat (Minkowski) spacetime and therefore can be, in principle, tested in the laboratory. Recently, we have investigated the connection between the Unruh effect and classical radiation for a uniformly accelerated particle. This link seems counterintuitive since the former is a purely quantum effect while the latter is a classic one. Nonetheless, we find that using a full quantum field treatment of the radiation exchanged by an accelerated charge with the surrounding Unruh thermal bath, the resultant power reduces at treelevel to the usual Larmor formula. The results are also consistent with the observation made by Unruh and Wald which states that the emission of a photon in the inertial frame corresponds to the emission or absorption of a photon in the accelerated frame. The fact that the derivation makes the link between the Unruh effect and the Larmor radiation from a uniformly accelerated charged particle clearer will perhaps help in resolving some of the controversies that have surrounded the Unruh effect since its discovery.
