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CERN Document Server 115 records found  1 - 10nextend  jump to record: Search took 0.64 seconds. 
1.
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 Galaxies as Probes of the Particle Physics Nature of Dark Matter / Lisanti, Mariangela (speaker) (Princeton University)
The hypothesis of Cold Dark Matter (CDM) has been spectacularly confirmed on the largest scales of the Universe and must now be stress-tested on sub-galactic scales.   Many well-motivated and generic alternatives to CDM can leave spectacular signatures on precisely these scales, affecting the evolution of galaxies as well as their population statistics. [...]
2024 - 4659. Theory Colloquia External link: Event details In : Galaxies as Probes of the Particle Physics Nature of Dark Matter
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2.
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 Positivity Constraints for condensed matter and cosmology / Creminelli, Paolo (speaker)
The coefficients of the operators of an effective field theory (EFT) are constrained to satisfy certain inequalities, under the (mild) assumption that the UV completion satisfies general requirements of causality and unitarity. I discuss the extension of these ideas to theories where the Lorentz symmetry is spontaneously broken, as it happens in cosmology and condensed matter physics [...]
2024 - 4116. Theory Colloquia External link: Event details In : Positivity Constraints for condensed matter and cosmology
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3.
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 Handling photons in lattice QCD / Meyer, Harvey (speaker) (Johannes Gutenberg University Mainz)
I describe some of the computational challenges posed by handling photons in lattice QCD. In Euclidean space, amplitudes containing final-state photons are expressed in terms of hadronic correlation functions with a strong infrared weighting, which are hard to control. [...]
2024 - 4130. Theory Colloquia External link: Event details In : Handling photons in lattice QCD
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4.
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 Physics of and from the large-scale structure of the Universe / Lewandowski, Matthew (speaker)
It is expected that measurements of the large-scale structure of the Universe will soon become our leading sources of fundamental cosmological information. In this talk, I will review some of the major progress, both theoretical and data-oriented, that we have made in understanding the physics of galaxy clustering, as well as what we might hope to learn about new physics (including primordial non-Gaussianities) from these measurements. [...]
2024 - 4457. Theory Colloquia External link: Event details In : Physics of and from the large-scale structure of the Universe
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5.
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 The Higgs Boson : From Theory to Experiment / Wagner, Carlos E.M. (speaker) (The University of Chicago)
The discovery of the Higgs boson in July 2012 was the highlight of an incredible  journey in High Energy Physics. The Higgs field was postulated as the minimal addition to the Standard Model (SM) fermion and gauge boson field content, allowing to provide masses to all known fundamental particle in a gauge invariant way.  The scale of these masses is given by the Higgs field vacuum expectation value and the  hierarchy of masses is dictated by the couplings of these particles to the Higgs boson.  The Higgs boson mass was anticipated by precision electroweak measurements, and the LHC has now studied its production and decay rates in many different channels, finding amazing consistency with this picture.  Apart from being the only known fundamental spin zero particle, the Higgs boson has,several fascinating properties: its couplings are flavor diagonal even under the presence of arbitrary complex Yukawas, its mass is  proportional to its self-coupling and the associated Higgs field vacuum expectation value  is unstable under the presence of new heavy fermion or scalar sectors. This implies some rigidity in the construction of natural extensions of the minimal Higgs picture, as well as some mystery regarding the scale of the Higgs vacuum expectation value.  I will discuss these questions, the efforts to go beyond the SM picture andthe relevant experimental program designed to study the properties of this fascinating particle and the associated Higgs field potential. This colloquium is part of the "Extended Scalar Sector from all angles" workshop (https://indico.cern.ch/event/1376030/). [...]
2024 - 4034. Theory Colloquia External link: Event details In : The Higgs Boson : From Theory to Experiment
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6.
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 Analytic properties of scattering amplitudes / Hannesdottir, Hofie (speaker)
In this talk, we will explore intricate ways in which physical principles are encoded in scattering amplitudes. In particular, we will discuss the imprints of causality and crossing symmetry on the analyticity properties of scattering amplitudes, and show how different observables can be related to one another via analytic continuations. [...]
2024 - 4190. Theory Colloquia External link: Event details In : Analytic properties of scattering amplitudes
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7.
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 Probing the Standard Model to 0.37 ppm with the muon anomalous magnetic moment / Lellouch, Laurent (speaker) (CNRS & Aix-Marseille U.)
For the past fifty years, the Standard Model has been hugely successful in describing subatomic phenomena. However, recent measurements of the anomalous magnetic moment of the muon (a_mu) appear to challenge that statement, as they show a significant discrepancy with the reference Standard Model prediction. [...]
2024 - 4529. Theory Colloquia External link: Event details In : Probing the Standard Model to 0.37 ppm with the muon anomalous magnetic moment
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8.
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 Exactly solvable irrelevant deformations and holography beyond AdS/CFT / Guica, Monica (speaker)
It is believed that gravity is holographic, namely that the gravitational dynamics in a given spacetime (region) can be encoded by a non-gravitational theory living on the boundary of that region. The AdS/CFT correspondence is an extremely successful concrete realization of the holographic idea; however, generalizing the holographic dictionary beyond AdS/CFT has proven to be difficult. [...]
2024 - 4133. Theory Colloquia External link: Event details In : Exactly solvable irrelevant deformations and holography beyond AdS/CFT
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9.
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 Update on reheating after inflation and its gravitational wave probes / Laine, Mikko Sakari (speaker) (Universitaet Bern (CH))
The reheating stage remains a strongly model-dependent and theoretically poorly understood part of the inflationary paradigm. However, the possibility that it could one day be tested via its gravitational wave signatures, and that it may also be related to other relicts such as dark matter or baryon asymmetry, continues to motivate studies with many models and methods. [...]
2024 - 4129. Theory Colloquia External link: Event details In : Update on reheating after inflation and its gravitational wave probes
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10.
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 Scattering Amplitudes: from Collider Physics to Geometry / Tancredi, Lorenzo (speaker) (Technische Universitat Munchen (DE))
In this talk I will review, in an introductory manner, the latest developments in the theory of scattering amplitudes and their connection to the geometrical properties of special classes of complex varieties. I will also discuss explicit examples of correlators and scattering amplitudes which can be related to elliptic geometries and beyond. [...]
2024 - Streaming video. Theory Colloquia External link: Event details In : Scattering Amplitudes: from Collider Physics to Geometry
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