Fundamental physics with ESPRESSO: Constraining a simple parametrisation for varying <i>?</i>
نویسندگان
چکیده
The spectrograph ESPRESSO recently obtained a limit on the variation of fine-structure constant, $\alpha$, through measurements along line sight bright quasar with precision $1.36$ ppm at $1\sigma$ level. This imposes new constraints cosmological models varying $\alpha$. We assume such model where electromagnetic sector is coupled to scalar field dark energy responsible for current acceleration Universe. parametrise $\alpha$ two extra parameters, one defining evolution quintessence component and other fixing coupling field. objective this work constrain these parameters both astrophysical local probes. also carried out comparative analysis how each data probe may our parametrisation. performed Bayesian by comparing predictions observations. datasets are composed spectra measurements, including latest point, as well Planck observations cosmic microwave background. combined results from atomic clocks MICROSCOPE experiment. placed parameter consistent null field, therefore compatible $\Lambda$CDM cosmology. dominated E\"otv\"os bound. More precise will be extremely important study it probes an interval redshift not accessible types However, particular model, available favour resulting mostly strong limits.
منابع مشابه
Constraining Fundamental Physics with the Cosmic Microwave Background
The temperature anisotropies and polarization of the cosmic microwave background (CMB) radiation provide a window back to the physics of the early universe. They encode the nature of the initial fluctuations and so can reveal much about the physical mechanism that led to their generation. In this contribution we review what we have learnt so far about early-universe physics from CMB observation...
متن کاملConstraining fundamental constants of physics with quasar absorption line systems
We summarize the attempts by our group and others to derive constraints on variations of fundamental constants over cosmic time using quasar absorption lines. Most upper limits reside in the range 0.5−1.5×10−5 at the 3σ level over a redshift range of approximately 0.5 − 2.5 for the fine-structure constant, α, the proton-to-electron mass ratio, μ and a combination of the proton gyromagnetic fact...
متن کاملFundamental physics with LISA
LISA has the potential to make observations that probe deeply into fundamental physics. Not only will it test to exquisite precision the general relativity model for gravitational radiation, but will also test strong-field gravity and in particular the proposition that all black holes are described by the Kerr metric. More research is needed, however, on how to quantify the theoretical meaning ...
متن کاملConstraining Electroweak Physics
The most fundamental observable related to the weak interaction is the muon lifetime, τμ. With the electromagnetic two-loop contribution known1, τμ can be used unambiguously to extract the Fermi constant, GF = 1.16637(1)× 10 −5 GeV, where the uncertainty is completely dominated by experiment. Adding the fine structure constant, α, one can obtain two relations between the intermediate gauge boso...
متن کاملConstraining New Physics with Vertex Corrections
We discuss how new physics not encompassed within the STU oblique correction framework can be constrained from precision electroweak measurements via vertex corrections to Z–pole observables. 1. Limitations of the Oblique Correction Analysis In constructing models beyond the Standard Model (SM) such as technicolor or supersymmetric theories, it is important to test their viability by looking fo...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Astronomy and Astrophysics
سال: 2022
ISSN: ['0004-6361', '1432-0746']
DOI: https://doi.org/10.1051/0004-6361/202243795