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ESPRESSO's Early Commissioning Results and Performance Related to Tests of Fundamental Constant Stability

A. C. O. Leite, C. J. A. P. Martins, P. Molaro, S. Monai, C. S. Alves, T. A. Silva, the ESPRESSO Science Team

Abstract
ESPRESSO is a new high-resolution ultra-stable spectrograph for the VLT, which had its first light on Telescope on November 27th, 2017. The instrument is installed in the Combined Coudé Laboratory and linked to the 4 Units of Telescope through optical Coudé Trains, being the first spectrograph able to collect the light from the 4 UTs simultaneously. One of the key science goals of the instrument is to test the stability of nature's fundamental couplings with unprecedented resolution and stability. ESPRESSO will allow to eliminate current known systematics and test the claim by Webb et al 2012 of a spatial dipole in the variation of the fine-structure constant. These improved results (either null or variation detections) will put strong constraints on a range of cosmological and particle physics parameters.

Keywords
Astrophysics - Instrumentation and Methods for Astrophysics; General Relativity and Quantum Cosmology; High Energy Physics - Phenomenology

Notes
Proceedings at http://moriond.in2p3.fr/Proceedings/2018/Moriond_Cosmology_2018.pdf

Proceedings of the 53rd RENCONTRES DE MORIOND
…tienne Aug ť, Jacques Dumarchez, Jean Tr‚n Thanh V‚n

ARISF
2018 December

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Instituto de Astrof√≠sica e Ci√™ncias do Espa√ßo Universidade do Porto Faculdade de Ciências da Universidade de Lisboa
Fundação para a Ciência e a Tecnologia COMPETE 2020 PORTUGAL 2020 União Europeia