Théorie

Multi-messenger astronomy at highest energy frontier with Large High-Altitude Air Shower Observatory

The discovery of astrophysical neutrino signal by IceCube neutrino telescope has extended the energy frontier of astronomy into Peta-electronvolt energy range. The nature of astronomical sources operating powerful particle accelerators and producing the highest energy neutrinos is currently uncertain. A breakthrough toward understanding of the nature of these sources can be achieved via detection of the gamma-ray counterpart of the astrophysical neutrino signal.

Multi-messenger astronomy at highest energy frontier with Large High-Altitude Air Shower Observatory

The discovery of astrophysical neutrino signal by IceCube neutrino telescope has extended the energy frontier of astronomy into Peta-electronvolt energy range. The nature of astronomical sources operating powerful particle accelerators and producing the highest energy neutrinos is currently uncertain. A breakthrough toward understanding of the nature of these sources can be achieved via detection of the gamma-ray counterpart of the astrophysical neutrino signal.

Multi-messenger modelling of galactic PeVatrons with cosmic rays, gamma-rays and neutrinos

New observations of gamma-rays in 100 TeV energy domain by HAWC and LHAASO, with future follow up by CTA, open new possibilities for understanding of particle acceleration to extreme energies in astronomical sources in our Milky Way galaxy. These sources, dubbed “PeVatrons” (yet to be identified) produce particles with energies up to several Peta-electronVolt, three orders of magnitude higher than those attained in the most powerful human-made accelerator LHC. They can also be responsible for the astrophysical neutrino signal observed by IceCube neutrino telescope.

Neutrinos and the discovery of the diffuse supernova neutrino background

Neutrinos and the discovery of the diffuse supernova neutrino background
 
The observation that neutrinos change flavor during propagation – termed neutrino oscillations - has shown that neutrinos are massive elementary particles with mixings which points to physics beyond the Standard Model and impacts astrophysics and cosmology. Neutrinos from core-collapse supernovae were observed only once, with SN1987A. Important open questions remain both on neutrino properties and on flavor evolution in dense environments.

Neutrinos : from non standard frameworks to the discovery of the diffuse supernova neutrino background

The observation that neutrinos change flavor during propagation – termed neutrino oscillations - has shown that neutrinos are massive elementary particles with mixings which points to physics beyond the Standard Model and impacts astrophysics and cosmology. While the discovery dates 1998, key questions remain open concerning neutrino properties, how neutrinos change flavor in dense environments and their impact on future observations.
 

Strong coupling physics, holography and cosmology

RESEARCH THEME: Using the AdS/CFT correspondence to study de Sitter space and Inflation driven at strong coupling.
 
SUBJECT AND NATURE OF PROPOSED WORK: The AdS/CFT correspondence give a new perspective both at strong coupling physics of quantum field theory and the nature of the gravitational interaction. This thesis will deal with  understanding the physics of de Sitter space and its famous problems, namely its realization, the divergences of correlation functions and the backreaction of quantum field theories.

APC researchers participate in seminars in Lyon.

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