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February 2015

Public Seminars

- Description:
- Groundhog Day

- User:
- High-Energy Seminars
- Time:
- 1:10pm - 2:10pm
- Description:
- Joint Theory Seminar

Speaker: Bibhushan Shakya (Michigan)

Email: bshakya@umich.edu

Title: Neutrino Masses and Sterile Neutrino Dark Matter from the PeV Scale

Host: Yuhsin

Room: 432

Abstract: The Higgs boson mass of 125 GeV is suggestive of superpartners at the PeV scale. This talk discusses how new physics at this scale can also produce active neutrino masses via a modified, low energy seesaw mechanism and provide a sterile neutrino dark matter candidate with keV-GeV scale mass. These emerge in a straightforward manner if the right-handed neutrinos are charged under a new symmetry broken by a scalar field vacuum expectation value at the PeV scale. Possible connections to the 3.5 keV X-ray line and the PeV neutrino events at IceCube will also be discussed. - Send Reminder:
- Yes - 3 days 4 hours before event

- User:
- High-Energy Seminars
- Time:
- 4:10pm - 5:00pm
- Description:
- Speaker: Andrew Neitzke, UT Austin

Date: Tue Feb. 3

Time: 4:10 PM (Refreshments 20 minutes before talk)

Location: 1147 MSB

Title: The many uses of BPS particles

Abstract: "BPS particles" are certain distinguished objects which

arise in supersymmetric quantum field theory. You do not have to know

what they are to understand this talk: I will focus on a simple class

of examples which are geometrically concrete and self-contained, where

BPS states correspond to certain special geodesics or geodesic webs on

Riemann surfaces. In the last few years it has been understood that

BPS states are connected to various other problems in mathematics and

physics, ranging from hyperkahler geometry to analysis of ODEs,

cluster algebras, and Chern-Simons theory. I will give an overview of

the story. Most of the work I review is joint work with Davide Gaiotto

and Greg Moore; I will also touch on some upcoming work with Dan

Freed. - Send Reminder:
- Yes - 4 hours before event

- User:
- High-Energy Seminars
- Time:
- 1:10pm - 2:00pm
- Description:
- Special Math/Physics Seminar

Speaker: Christopher Herzog

Room: 432

Title: The Structures of Entanglement

Abstract: Entanglement entropy plays a large role in theoretical physics today in quantum mechanics, condensed matter physics, quantum field theory, gravity, and even string theory. I will discuss some of the recent successful applications of entanglement ideas and also some of the challenges we still face. The second half of the talk will largely be devoted to recent progress in understanding thermal corrections to entanglement entropy. - Send Reminder:
- Yes - 1 hours before event

- User:
- High-Energy Seminars
- Time:
- 2:20pm - 3:30pm
- Description:
- Speaker: Daniel Litim, University of Sussex

(Visitor to Steve Carlip's quantum gravity class, giving a

seminar open to all.)

Email:

Room: 185

Host: Carlip

Title: Interacting UV fixed points - from 4D quantum gauge

theories to 4D quantum gravitation

Abstract:

It is commonly believed that a fundamental definition of

quantum field theory requires the existence of an UV fixed

point. Asymptotic freedom of QCD is the well-known

example where the fixed point is non-interacting. In this talk, I provide a proof of existence for novel classes of 4D

matter-gauge theories whose high-energy behaviour is

governed by an interacting UV fixed point. In the absence

of asymptotic freedom, scalars, fermions, and non-Abelian

gauge fields cooperate in such a way that an interacting

UV fixed point emerges. I discuss the key characteristics

of these theories which are all under strict perturbative

control. I also discuss recent advances and challenges to

find interacting UV fixed points in 4D quantum gravity

once couplings become strong. - Send Reminder:
- Yes - 4 hours before event

- User:
- High-Energy Seminars
- Time:
- 11:00am - 12:00pm
- Description:
- Terning group meeting

- User:
- High-Energy Seminars
- Time:
- 1:10pm - 2:00pm
- Description:
- Special Math/Physics Seminar

Speaker: Sergei Dubovsky

Email: sergei.dubovsky@gmail.com

Title: On the hierarchy problem

Host: Markus Luty

Room: 432

Abstract: The origin of the huge hierarchy between the electroweak and the Planck scales

remains the major problem driving the development of particle physics and quantum field theory over the last four decades. I will review the conventional views on its resolution, which is either emergence of new physics at the TeV scale or anthropic fine-tuning. Then I will explore an alternative: the "third way", involving a refined notion of naturalness. I will describe a family of toy UV complete quantum theories providing a proof of concept for this possibility. In these models low energy physics is described by a tuned effective field theory, which exhibits relevant interactions not protected by any symmetries that are separated by an arbitrarily large mass gap from the new gravitational physics, represented by a set of irrelevant operators. Despite this scale separation, the only available language to describe dynamics at all energy scales does not require any fine-tuning. An interesting novel feature of this construction is that UV physics is not described by a fixed point and is governed by a novel type of asymptotic behavior. - Send Reminder:
- Yes - 3 days 4 hours before event

- User:
- High-Energy Seminars
- Time:
- 4:00pm - 5:00pm
- Description:
- HE Seminar

Speaker: Aaron Manalaysay

Email: aaronm@ucdavis.edu

Title: Dark Matter and Liquid Xenon

Host: Mani Tripathi

Room: 432

Abstract: - Send Reminder:
- Yes - 4 hours before event

- User:
- High-Energy Seminars
- Time:
- 1:10pm - 2:00pm
- Description:
- Speaker: Liam Fitzpatrick

Room: Physics 432

Title: Universal Dynamics from the Conformal Bootstrap

Abstract: Conformal Field Theories (CFTs) play a central role in understanding strongly coupled physics across a wide range of phenomena. One of the most powerful tools for studying them is the Conformal Bootstrap, which in the past several years has seen renewed interest and tremendous progress in its applications. In this talk, we discuss how the Conformal Bootstrap can be used to uncover and prove universal dynamical behavior that is satisfied by all CFTs in some limits, and large classes of them in other limits. Through the Anti-de Sitter/CFT (AdS/CFT) correspondence, these results can be interpreted to imply universal aspects of dynamical behavior of the dual gravitational theories, including locality and the emergence of Newtonian gravity at large distances. For CFTs in two dimensions, we demonstrate how in systems with a large number of degrees of freedom, high energy eigenstates can be shown to create classical backgrounds. This can be directly related to black hole geometries in a semi-classical limit of the gravitational duals, and to a phenomenon known as Eigenstate Thermalization whereby pure states mimic thermal backgrounds in the CFT. Methods for going beyond the semi-classical limit of gravity are discussed.

- User:
- High-Energy Seminars
- Time:
- 11:00am - 12:00pm
- Description:
- Terning group meeting

- Description:
- Valentine's Day

- Description:
- Presidents' Day

- User:
- High-Energy Seminars
- Time:
- 4:00pm - 5:00pm
- Description:
- HE Seminar

Speaker: Surjeet Rajendran

Email: surjeet@berkeley.edu

Title: Searches for ultralight hidden photons

Host: Tripathi

Room: 432

Abstract: - Send Reminder:
- Yes - 4 hours before event

- User:
- High-Energy Seminars
- Time:
- 1:10pm - 2:00pm
- Description:
- Special Seminar

Speaker: Chris Beem

Room: 432

Title: Studying challenging theories with the superconformal bootstrap

Abstract: Despite its tremendous theoretical and experimental successes, there are good reasons to think that our current understanding of quantum field theory is incomplete in important ways. One of these reasons is the apparent existence of quantum field theories that cannot be given a conventional definition in terms quantum fields and Lagrangians. In this talk, I will introduce such a puzzling class of interacting quantum field theories in six dimensions that have resisted direct analysis since their discovery in the 90s. I will then describe an algebraic approach to these theories based on the superconformal bootstrap. This approach has led to the first exact calculations of correlation functions in these theories and appears to provide a useful framework for their systematic analysis.

- User:
- High-Energy Seminars
- Time:
- 11:00am - 12:00pm
- Description:
- Terning group meeting

- User:
- High-Energy Seminars
- Time:
- 1:10pm - 2:00pm
- Description:
- Joint Theory Seminar

Speaker:

Email:

Title:

Host:

Room: 432

Abstract: - Send Reminder:
- Yes - 3 days 4 hours before event

- User:
- High-Energy Seminars
- Time:
- 4:00pm - 5:00pm
- Description:
- HE Seminar

Speaker: Rick Norman

Email: ebnorman@lbl.gov

Title: Seaborg’s Plutonium? A Case Study in Nuclear Forensics

Host: Mani Tripathi

Room: 432

Abstract: Passive x-ray and gamma–ray analysis was performed on UC Berkeley’s EH&S Sample S338. The object was found to contain 239Pu. No other radioactive isotopes were observed. The mass of 239Pu contained in this object was determined to be 2.0 + 0.3 μg. These observations are consistent with the identification of this object as containing the 2.77-μg PuO2 sample produced in 1942 and described by Glenn Seaborg and his collaborators as the first sample of 239Pu that was large enough to be weighed. - Send Reminder:
- Yes - 4 hours before event

- User:
- High-Energy Seminars
- Time:
- 1:10pm - 2:00pm
- Description:
- Speaker: Mukund Rangamani

Location: Physics 432

Title: Gravity & Hydrodynamics

Abstract: Classical general relativity describes the dynamics of gravity through the Einstein's equations, while relativistic fluids are governed by a generalization of the famous Navier-Stokes equations. Though a-priori we don't tend to think of these two physical systems in the same breath, I will argue that in a certain dynamical regime, the gravitational equations precisely become those of fluid dynamics. This statement, which embodies the fluid/gravity correspondence, has over the past few years not only helped us in understanding the transport properties of some strongly coupled systems, but is proving to be a prototype for the development of an autonomous theory of hydrodynamics. I will explain the basic statement of the correspondence and the lessons we have learned from it, focussing on the development of a Wilsonian effective field theory for thermal systems. - Send Reminder:
- Yes - 4 hours before event

- User:
- High-Energy Seminars
- Time:
- 11:00am - 12:00pm
- Description:
- Terning group meeting

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