CERN Accelerating science

Colloquia

Latest additions:
2022-11-18
12:47
The Practice and Sociology of Natural Science / Peebles, James (speaker) (Princeton University)
Lessons about research in the natural sciences can be drawn from the sociology of science. For example, in 1960 Einstein's general theory of relativity was standard and accepted physics, and elements of it were on the qualifying exam I wrote as a graduate student. [...]
2022 - 1:24:34. CERN Colloquium External link: Event details In : The Practice and Sociology of Natural Science

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2022-10-31
08:35
Small Cosmological Constants in String Theory / McAllister, Liam (speaker) (Cornell University)
I will present a construction of vacua of string theory in which the magnitude of the cosmological constant is exponentially small.  The vacua are supersymmetric AdS solutions in flux compactifications of type IIB string theory, with all moduli stabilized.  The vacuum energy is small because we ensure the exact cancellation of all perturbative contributions, through an explicit choice of integer parameters determined by the topology and quantized fluxes.  The nonperturbative contributions that remain are exponential in these integers.  Finding cosmological constants of small magnitude in this landscape is exponentially easier than in Bousso-Polchinski landscapes, but extending our approach to positive cosmological constants in realistic universes is a difficult open problem..
2022 - 1:15:34. Theory Colloquia External link: Event details In : Small Cosmological Constants in String Theory

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2022-09-30
15:25
The large charge expansion / Reffert, Susanne (speaker) (Universitaet Bern (CH))
Over the last few years, it has become clear that working in sectors of large global charge leads to significant simplifications when studying strongly coupled CFTs, theories which are otherwise often inaccessible to analytic methods. It allows us in particular to calculate the CFT data as an expansion in inverse powers of the large charge. In this talk, I will introduce the large-charge expansion via the simple example of the O(2) model and will then generalize it to the O(N) vector model which displays a richer structure due to its non-Abelian global symmetry group. [...]
2022 - 1:03:02. Theory Colloquia External link: Event details In : The large charge expansion

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2022-08-29
13:59
Wormhole effects in quantum black hole physics / Stanford, Douglas (speaker) (Stanford University)
A powerful idea in theoretical physics is the conjecture that (from a distance) black holes behave like ordinary quantum systems. Thought of in this way, black holes display many deep quantum phenomena in simple but often surprising ways. [...]
2022 - 1:09:04. Theory Colloquia External link: Event details In : Wormhole effects in quantum black hole physics

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2022-07-07
14:25
Lepton Number Violation at Colliders via Heavy Neutrino-Antineutrino Oscillations / Antusch, Stefan (speaker)
2022 - 1:13:17. Theory Colloquia External link: Event details In : Lepton Number Violation at Colliders via Heavy Neutrino-Antineutrino Oscillations

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2022-07-06
07:58
Nuclear Arms Control: Help wanted / von Hippel, Frank N. (speaker) (Princeton University)
During World War II, Niels Bohr met with both President Roosevelt and Prime Minister Churchill to warn them that a nuclear arms race was likely if the Soviet Union were not engaged immediately in consultations on how nuclear weapons could be controlled after the war. Physicists played critical roles in informing the negotiators of all post-war nuclear arms control agreements, especially those limiting nuclear testing and ballistic missile defenses. [...]
2022 - 1:26:16. CERN Colloquium External link: Event details In : Nuclear Arms Control: Help wanted

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2022-07-05
14:30
Quantum Field Theory Tools for Gravitational Wave Science / Solon, Mikhail (speaker)
Future gravitational wave detectors will map out and characterize every binary merger in the history of the universe. The possibilities for new and unexpected scientific discoveries from this wealth of data is staggering, but hinges crucially on complementary advances in our theoretical understanding of the nature of gravitational wave sources. [...]
2022 - 1:06:59. Theory Colloquia External link: Event details In : Quantum Field Theory Tools for Gravitational Wave Science

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2022-06-23
10:36
50 Years of Supersymmetry / Shifman, Michael (speaker) (Tate Lab.of Phys.,Theor. Phys.Inst. - University of Minnesota)
CERN was one of the birthplaces of four-dimensional supersymmetry. 50 years elapsed after SUSY inception — a time long enough for a comprehensive review of its impact on high energy physics, quantum field theory, mathematical physics and beyond [...]
2022 - 1:19:12. Theory Colloquia External link: Event details In : 50 Years of Supersymmetry

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2022-06-20
10:22
Natural experiments: legal, moral, and possible / Diamond, Jared (speaker) (University of California, Los Angeles, US)
The preferred method for obtaining knowledge in the laboratory sciences is by the manipulative controlled experiment. For example, in order to establish the effect of a certain chemical, a scientist adds that chemical to one of two test tubes containing identical solutions, maintaining the other test tube as an unmanipulated control. Unfortunately, for most important questions of the social sciences and field biology, decisive manipulations of interest would be illegal, immoral, or impossible. [...]
2022 - 1:13:21. CERN Colloquium External link: Event details In : Natural experiments: legal, moral, and possible

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2022-06-20
10:12
Why FCC? / Mangano, Michelangelo (speaker) (CERN)
The Future Circular Collider (FCC) is CERN's flagship proposal for a post-LHC accelerator facility. Similarly to the LEP/LHC sequence, it foresees the sequence of an e+e– collider (optimized for precision measurements of Higgs, EW and top quark properties), and a successive 100 TeV pp collider, both hosted in a new ~100km tunnel [...]
2022 - 1:12:09. Theory Colloquia External link: Event details In : Why FCC?

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