## Events

### Workshop on Controlled Fabrication of NV Centers in Diamonds

March 10th-11th, 2018
UCLA Physics & Astronomy Department

The properties of NV centers in diamonds have been extensively explored over the past 20 years. Single-site experiments with extraordinary precision and resolution have been demonstrated, raising expectations for revolutionary metrology/spectroscopy applications. However, all potential applications require a highly reproducible and precise placement of NV centers in pure synthetic diamond crystals.

Confronted with the requirements of proposed applications, the Workshop intends is to examine the limits and potentials of techniques used to control the NV center’s concentration, orientation, and relative depth below the diamond surface, while maintaining their excellent sensing properties. Ultimately, realizing the full potential of many of the proposed applications will require producing NV centers at a precision, scale and cost beyond what is currently possible. By bringing together experts in CVD, MWP-CVD growth, ion-implantation, and diamond processing with the instrument builders who are using the NV centers, the workshop will explore the intersection of future needs with manufacturing capabilities.

Organizers: Ania Bleszynski Jayich (UCSB), Karoly Holczer (UCLA), Susumu Takahashi (USC)

### QCD Meets Gravity Workshop 2017

December 11th-15th, 2017
UCLA Physics & Astronomy Department

This is the third in a series of meetings for researchers interested in the remarkable correspondence between Yang-Mills theory and gravity, known as the double-copy construction. An early manifestation of this is the KLT relations.

The BCJ double-copy construction has greatly simplified multiloop perturbative computations in gravity theories, leading to new insight into the ultraviolet properties of gravity theories. Currently there an intense global research activity to understand the origin of the relation as well as to apply it to more general classical solutions in General Relativity. This meeting will bring together experts in both QCD and gravity (including supersymmetric extensions), and focus on the development of common methodologies for handling both theories.

Organizers: Zvi Bern (UCLA), Clifford Chueng (Caltech), Donal O'Connell (Edinburgh), Radu Roiban (Penn State), Jaroslav Trnka (UC Davis), Henrik Johansson (Uppsala).

November 8-10, 2017 (Wednesday, Thursday, Friday)
UCLA Physics & Astronomy Department

There have been exciting recent progress in the field of QCD, including: new understanding of factorization, resummation and power corrections that give insight into effective field theories; a new ability to compute NNLO and beyond perturbative corrections that allow precision jet phenomenology at the LHC and other future colliders; better organizing principles for computing multi-loop corrections; the development of new parton showers with higher-order matching; and, many other new advances. This workshop will bring together a small group of experts to allow for targeted discussions that identify possible future advances that merge these new ideas. The topics we plan to discuss include but are not limited to:

• Factorization in effective field theory, including the impact of Glauber logs and power corrections;
• Resummation-based subtraction techniques and their latest precision phenomenology results;
• Recent advances in parton shower Monte Carlos;
• New PDFs and the impact of resumation on improving their uncertainty;
• Combining QCD and electroweak effects in precision observables;
• Developments in calculating two-loop virtual corrections and beyond.

This is the second year for this workshop following a very successful "Advances in QCD and Applications to Hadron Colliders 2016 Workshop" held at Argonne National Laboratory October 26 - 28, 2016. This year the workshop will be co-sponsored by Mani L. Bhaumik Institute for Theoretical Physics at UCLA and Argonne National Laboratory. The workshop will be held at UCLA Department of Physics and Astronomy.

Organizers: Radja Boughezal (ANL), Fernando Febres Cordero (Freiburg), Zhongbo Kang (UCLA), Mao Zeng (UCLA).

#### Southern California Strings Seminar Fall 2017

The Southern California Strings Seminar returns to UCLA for Fall 2017 on Friday, December 1st. We gather and discuss new ideas and developments, both general and specialized, in the field. This year's speakers include David Simmons-Duffin, Vladimir Rosenhaus, Edward Witten (as part of IPAM's Green Family Lecutre Series), and Daniel Jafferis.

#### Activities in the Los Angeles area

Click here for a list of activities at UCLA and in nearby communities.

### Bhaumik Lectures

• • Thursday May 29, 2018:
John Preskill (CalTech)
•   Topic TBD
• • Thursday May 10, 2018, 4:00pm, PAB 1-434:
Lisa Randall (Harvard)
Topic TBD
• • Tuesday. Feburary 27, 2018, 5:15pm, Lenart Auditorium, Fowler Museum:
Kip Thorne (CalTech)
Geometrodynamics: The Nonlinear Dynamics of Warped Spacetime
• • Monday January 22, 2018, 5:00pm, CNSI Auditorium:
Sir Roger Penrose (Oxford)
New Cosmological View of Dark Matter, which Strangely and Slowly Decays

### Seminars and colloquia

Theoretical Elementary Particle (TEP) Physics seminars

SPECIAL SCHWINGER100 SEMINAR

Monday February 5, 2018, 2:00pm, PAB 4-708
Bob Finkelstein (UCLA)
Are Dyons the Preons of the Knot Model

#### SPECIAL TEP Seminar

Monday, February 5th at 3:00 PM in PAB 4-330.

Gabriele Veneziano (CERN) presents Spontaneous CP breaking and the axion potential: an effective Lagrangian approach"

After a quick review of the U(1) and strong-CP problems in QCD I will turn to some recent work on spontaneous CP violation in QCD at vacuum angle $\theta = \pi$ and to its possible relevance for determining the axion potential at temperatures up to the deconfinement temperature $T_c$. Using an effective Lagrangian approach, valid in the double large-N and chiral limit (with $r_i \sim m_iN /\Lambda$ fixed), we determine the regions in the multidimensional parameter space of the $r_i$ where CP is spontaneously broken/unbroken at $\theta=\pi$. The two regions are separated by an hypersurface on which lines of first order transitions end,  there is a massless pseudoscalar meson (in spite of chiral symmetry being explicitly broken), and the topological susceptibility of QCD diverges. When we add to the model a generic axion field (in order to ensure CP at all values of $\theta$) the above considerations have a bearing on the shape of the axion potential near the boundary of its periodicity interval. This may have implications on the calculation of axionic dark matter abundance if some $r_i$ have a marked temperature dependence as one approaches $T_c$.

Monday, December 4th at 3:00 PM in PAB 4-708.

Emily Nardoni (UCSD) presents Anomalies for 4d SCFTs from M5-branes

Many interesting, generically strongly-coupled 4d superconformal field theories can be obtained by compactifying the 6d (2,0) theories on a punctured Riemann surface. As we review, various amounts of supersymmetry can be preserved in 4d depending on the partial topological twist over the surface. We consider the structure of 't Hooft anomalies in these theories when the Riemann surface has punctures that preserve N=2 supersymmetry, and explain how these anomalies can be derived from the parent 6d theory. When the 6d (2,0) theory has a description in terms of M5-branes, we explain how anomaly inflow for the M5-branes in the presence of a puncture on the Riemann surface leads to new terms in the M5-brane anomaly polynomial, which then contributes to the anomalies of the low energy 4d theory.

#### Bhaumik Luncheon Young Scientists Seminar (BLYSS)

The next Bhaumik Luncheon Young Scientists Seminar (BLYSS) takes place on Friday, March 2nd, at 11:50AM in PAB 4-330. Speakers to be announced soon!

Our new seminar series, the Bhaumik Luncheon Young Scientists Seminar (BLYSS) launched on Friday, October 20th, at 11:50AM in PAB 4-330. The goal of this seminar is to learn about exciting new ideas from up-and-coming scientists in the department and from around the world. We begin this season with Justin Christensen and Se Kwon Kim.

#### Bhaumik Luncheon Seminar

Tuesday March 21 at 11:50AM in PAB 4-330.

TBD

TBD

Monday, November 13 at 11:50AM in PAB 4-330.

Troy Carter presents The Physics of Turbulent, Collisionless Plasmas

Magnetized plasma turbulence is thought to play an essential role in a number of astrophysical processes, for example angular momentum transport and heating accretion disks and heat conduction in galaxy clusters.  These plasmas are hot and tenuous and the collisional mean free path can be comparable to or larger than the system size.  Describing these plasmas, even on the largest scales, requires physics beyond magnetohydrodynamics.  I will discuss recent progress in using kinetic plasma physics to understand these systems and enumerate opportunities for future work coupling theoretical astrophysics with plasma physics including simulation and laboratory experiments.

#### Other seminars

Theory of Elementary Particles, Astroparticle Physics, and Phenomenology (TEPAPP) seminars

### Weekly Bhaumik Institute tea

The Bhaumik Institute hosts a weekly tea on the 4th floor bridge between PAB and Knudsen most Tuesdays from 3:30PM to 4:00PM. On some weeks a Bhaumik seminar or other Institute event will follow. Everyone in the Department is invited. Faculty, postdocs and graduate students in all areas of theoretical physics are especially encouraged to attend.