High Energy Physics News & Events

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A no-go theorem for exotic alternatives to black holes as LIGO/Virgo sources

Five of the ground-breaking gravitational wave detections by the LIGO/Virgo collaboration have been interpreted as black hole collisions forming a more massive black hole. It is hard to demonstrate conclusively that these objects are indeed black holes, and there is a lively debate on the intriguing possibility that other, more exotic alternatives could explain the observations. In an article to appear in Physical Review Letters, Gr@v members P.

TeV-scale gravity at the LHC, and the way forward in an era lacking significant excesses

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Speaker
Elena Villhauer (U. C. Irvine ATLAS, CERN)
Event date
Venue
GAP room
Event type
Abstract: The hierarchy problem and the irreconcilability of quantum mechanics and general relativity are two of the most frustrating problems that the Standard Model fails to solve. The existence of extra dimensions, however, would provide the much awaited solutions. If extra dimensions exist and push the Planck scale down to the TeV range, signatures of extra dimensions could be found at the Large Hadron Collider in Geneva, Switzerland. Results of TeV-scale gravity searches with the ATLAS and CMS detectors at 13 TeV are summarized, and outlook is provided on the best way forward in the absence of discoveries.

On the way towards a phenomenologically consistent GUT

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Speaker
Roman Pasechnik (THEP - Lund U.)
Event date
Venue
GAP room
Event type

Abstract: A new E8-inspired SUSY GUT theory unifying gauge and Yukawa interactions via unification of color, left-right and family symmetries will be presented. The prominent phenomenological potential of this model in predicting the fermion mass/mixing spectra will be discussed.

 

Shaping the fermion sector with CP symmetry of order 4

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Speaker
Igor Ivanov (CFTP - IST)
Event date
Venue
GAP room
Event type

Abstract: It is well known that discrete symmetries such as CP are not uniquely defined in quantum field theory, and a certain freedom of their definition exists. In particular, the CP transformation can be of order 4, not 2, and still lead to acceptable phenomenology.