Joint Theory Seminar
Speaker: David Kubiznak
Title: Black hole analogue of triple point and reentrant phase transition
Host: Steve Carlip
Room: 432
Abstract: We study the thermodynamic behavior of doubly-spinning d=6 Kerr-anti de Sitter black holes in the canonical ensemble of fixed angular momenta, interpreting the cosmological constant as thermodynamic pressure. We find, dependent on the ratio of the two angular momenta q=J2/J1, qualitatively different interesting phenomena known from the ``every day thermodynamics of simple substances''. In particular, for certain q's the system displays the presence of a large/intermediate/small black hole phase transition with one triple and two critical points. This behavior is reminiscent of the solid/liquid/gas phase transition except that the coexistence line of small and intermediate black holes does not continue for an arbitrary value of pressure (similar to the solid/liquid coexistence line) but rather terminates at one of the critical points. Even more interestingly, for q=0 we find a reentrant phase transition, in which a monotonic variation of the temperature yields two phase transitions from large to small and back to large black holes. This situation is similar to that seen in multicomponent liquids.
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High-Energy Seminars
Time:
8:10am - 9:10am
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Description:
Speaker: Gabriel Orebi Gann
Institution: UC Berkeley
Title: SNO+: The Precision Era of Neutrino Physics
Host: Bob Svoboda
Room:
Abstract: Neutrinos are one of the most fascinating particles that occur in nature: hundreds of millions of times smaller than the proton, the neutrino was once thought to be massless and to travel at the speed of light. Huge strides have been made in our understanding of neutrinos in past decades, with the resolution of the solar neutrino problem providing clear evidence of neutrino oscillation and, thus, a non-zero neutrino mass. This has allowed us to move beyond the basic questions to a precision era, in which we can study further properties of these fundamental particles. This talk will introduce the SNO+ experiment: a multi-purpose neutrino experiment with a broad experimental program and wide physics reach. SNO+ will search for the answer to the very nature of the neutrino: is it unique among fermions as being its own antiparticle? Can we place limits on the absolute mass scale? SNO+ will also follow on from the extremely successful SNO experiment with an extensive solar neutrino program, in which we can use the Sun to study neutrinos more closely, and neutrinos to study the Sun.
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High-Energy Seminars
Time:
4:10am - 5:10am
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Description:
LHC Lunch
Informal lunch with occasional talks
Host: Markus Luty
Speaker: Jiayin Gu
Title: Higgs mass from compositeness at a multi-TeV scale
Room: 432
Abstract: We propose a composite Higgs model based on top condensation seesaw mechanism. With the addition of a new vector-like quark, this model has a 2-Doublet 2-Singlet composite scalar sector that preserves an approximate U(3)_L flavor symmetry. The lightest CP-even neutral scalar is a PNGB of the approximate U(3)_L symmetry and can be significantly lighter than the other new states in the model. Remarkably, its mass has a rather restricted range, 80 <~ M_h <~ 180 GeV, within reasonable regions of the parameter space of the model, even with modest additional U(3)_L breaking effects from electroweak interactions. It also has very Standard Model like couplings and is therefore a natural candidate for the 126 GeV Higgs boson discovered at the LHC. The main constraint of this model comes from the Peskin-Takeuchi T parameter, which requires the chiral symmetry breaking scale to be much higher than the electroweak scale. The other new states are too heavy to be probed by the LHC, but may be within the reach of a future collider with center-of-mass energy of O(100) TeV. Measuring T parameter more precisely will also constitute a probe to the model.
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High-Energy Seminars
Time:
5:00am - 6:00am
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Description:
No seminar
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High-Energy Seminars
Time:
8:10am - 9:00am
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Description:
Joint Theory Seminar
Speaker: Jay Wacker
Title: The SIMP miracle
Host: Luty
Room: 432
Abstract: TBA
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High-Energy Seminars
Time:
5:10am - 6:10am
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Description:
LHC Lunch
Informal lunch with occasional talks
Host: Markus Luty
Speaker:
Title:
Room: 432
Abstract:
User:
High-Energy Seminars
Time:
5:00am - 6:00am
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Yes - 1 day 4 hour 0 minutes before start
Description:
User:
High-Energy Seminars
Time:
8:10am - 9:00am
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Description:
Speaker: Jack Gunion
Title: CMS data and the pMSSM
Host: Jack Gunion
Room: 432
Abstract:
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High-Energy Seminars
Time:
4:10am - 5:10am
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Description:
LHC Lunch
Informal lunch with occasional talks
Host: Yuhsin Tsai
Speaker: Sonia El Hedri
Title: Bottom-up naturalness
Room: 432
Abstract: We study the naturalness problem using a model independent bottom up approach by considering
models where only the interaction terms needed to cancel the Higgs quadratic divergences are present.
If quadratic divergences are canceled by terms linear in the Higgs field, then the collider phenomenology
is well covered by current electroweakino and fourth generation searches. If quadratic divergences
are canceled by terms bilinear in the Higgs field, then the signatures are highly dependent on the
quantum numbers of the new particles. Precision Higgs measurements can reveal the presence of
new particles with either vevs or Standard Model charges. If the new particles are scalar dark matter
candidates, their direct and indirect detection signatures will be highly correlated and within the reach
of XENON100 and Fermi. Observation at one of these experiments would imply observation at the
other one. Observable LHC decay channels can also arise if the new particles mix with lighter states.
This decay channel involves only the Higgs boson and not the gauge bosons. Observation of such
decays would give evidence that the new particle is tied to the naturalness problem.
User:
High-Energy Seminars
Time:
5:00am - 6:00am
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Description:
Joint Theory Seminar
Speaker: Timothy Cohen
Title: On Heavy Supersymmetry
Host: Markus Luty
Room: 432
Abstract: The discovery of a 125 GeV SM-like Higgs boson along with the absence of additional new physics signals have reinvigorated studies of "simple" supersymmetry breaking sectors. One such paradigm relies on anomaly plus gravity mediation; this model favors 3 TeV wino dark matter and gluinos in the O(10 TeV) range. Given these large masses, this model is difficult to test. In this talk, we will review the status of this scenario, followed by a description of two concrete experimental probes. An existing search for line photons emanating from the center of the galaxy will be used to challenge the wino dark matter hypothesis. Estimates for the reach of a future 100 TeV proton collider will be shown. This will demonstrate the potential to probe much of the interesting parameter space using human buildable technology.
User:
High-Energy Seminars
Time:
5:10am - 6:10am
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Yes - 0 days 4 hour 0 minutes before start
Description:
LHC Lunch
Informal lunch with occasional talks
Host: Markus Luty
Speaker:
Title:
Room: 432
Abstract:
5am» Joint Theory Seminar: David Kubiznak