Currently, General Relativity (GR) and the standard model of particles physics are severely challenged by their inability to explain the late-time accelerated expansion of the Universe, known as the dark energy problem. The most p...
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Información proyecto DhostHunt
Duración del proyecto: 34 meses
Fecha Inicio: 2020-03-11
Fecha Fin: 2023-01-31
Líder del proyecto
AARHUS UNIVERSITET
No se ha especificado una descripción o un objeto social para esta compañía.
TRL
4-5
Presupuesto del proyecto
207K€
Fecha límite de participación
Sin fecha límite de participación.
Descripción del proyecto
Currently, General Relativity (GR) and the standard model of particles physics are severely challenged by their inability to explain the late-time accelerated expansion of the Universe, known as the dark energy problem. The most promising scenarios aiming to explain it are the so--called scalar-tensor theories, corresponding to extensions of GR where gravity is enhanced through a new gravitational force mediated by a scalar field. The quest for phenomenological imprints of new scalar gravitational forces has been a central effort in cosmology and astrophysics over the last decade.
My goal is to introduce helioseismology as a test of unprecedented accuracy in the search for new gravitational forces in Nature. The focus will be on the most general scalar-field extensions of GR, known as DHOST scalar-tensor theories. The unique ability of solar pulsations to probe the finest details of gravity in the solar interior, combined with the extreme accuracy of helioseismic observations, promises an orders-of-magnitude improvement of previous constraints.
I will formulate the theoretical framework for adiabatic stellar pulsations in this context, and with sophisticated numerical techniques, I will model the associated solar pulsation eigenspectrum. A systematic statistical analysis will be devised to confront the predictions against observations making use of powerful helioseismic inversions, and derive the tightest constraints on the most general scalar-tensor theories up to date. The cosmological implications will be predicted, in accordance with ESA’s upcoming Euclid satellite mission.
The project will introduce a genuinely novel, interdisciplinary line of research that will strongly impact a broad spectrum of cosmology and astrophysics. The new constraints will be pivotal for our understanding of scalar-gravity interactions in Nature, and are expected to guide the future modelling of dark energy, and scalar field theories in general.