News from the Swampland—constraining string theory with astrophysics and cosmology
Our current best guess for a unified theory of gravitation and quantum field theory (string
theory) generically predicts a set of requirements for a consistently quantized theory, the …
theory) generically predicts a set of requirements for a consistently quantized theory, the …
Cosmology with varying fundamental constants from hyperlight, coupled scalars
M Baryakhtar, O Simon, ZJ Weiner - Physical Review D, 2024 - APS
The fundamental constants at recombination can differ from their present-day values due to
degeneracies in cosmological parameters, raising the possibility of yet-undiscovered …
degeneracies in cosmological parameters, raising the possibility of yet-undiscovered …
Cosmic microwave background search for fine-structure constant evolution
In some extensions of the standard model of particle physics, the values of the fundamental
coupling constants vary in space and time. Some observations of quasars hint at time and …
coupling constants vary in space and time. Some observations of quasars hint at time and …
On the implications of the `cosmic calibration tension' beyond and the synergy between early- and late-time new physics
V Poulin, TL Smith, R Calderón, T Simon - arXiv preprint arXiv:2407.18292, 2024 - arxiv.org
Thecosmic calibration tension'is a $> 5\sigma $ discrepancy between the cosmological
distance ladder built from baryonic acoustic oscillations (BAO) calibrated by the …
distance ladder built from baryonic acoustic oscillations (BAO) calibrated by the …
Cosmology and fundamental physics with the ELT-ANDES spectrograph
CJAP Martins, R Cooke, J Liske, MT Murphy… - Experimental …, 2024 - Springer
Abstract State-of-the-art 19th century spectroscopy led to the discovery of quantum
mechanics, and 20th century spectroscopy led to the confirmation of quantum …
mechanics, and 20th century spectroscopy led to the confirmation of quantum …
Fundamental constants: from measurement to the universe, a window on gravitation and cosmology
JP Uzan - arXiv preprint arXiv:2410.07281, 2024 - arxiv.org
Fundamental constants are a cornerstone of the physical laws. Any constant varying in
space and/or time would signal a violation of local position invariance and be associated …
space and/or time would signal a violation of local position invariance and be associated …
The mass effect--Variations of masses and their impact on cosmology
N Schöneberg, L Vacher - arXiv preprint arXiv:2407.16845, 2024 - arxiv.org
We summarize and explain the current status of variations of fundamental masses in
cosmology, with a particular focus on variations of the electron mass. We show that electron …
cosmology, with a particular focus on variations of the electron mass. We show that electron …
Incompatibility of fine-structure constant variations at recombination with local observations
L Vacher, N Schöneberg - Physical Review D, 2024 - APS
Some attempts of easing the critical Hubble tension present in modern cosmology have
resorted to using variations of fundamental constants, such as the fine-structure constant, at …
resorted to using variations of fundamental constants, such as the fine-structure constant, at …
A speed limit on tachyon fields from cosmological and fine-structure data
The rolling tachyon is a non-canonical scalar field model well motivated in string theory
which naturally predicts variations of the fine-structure constant. Such variations can in …
which naturally predicts variations of the fine-structure constant. Such variations can in …
Infinity Wars: Three Types of Singularities in Non-supersymmetric Canonical Gravity and String Theory
M McGuigan - arXiv preprint arXiv:2302.06811, 2023 - arxiv.org
We discuss three separate types of infinities that occur in non-supersymmetric canonical
gravity and string theory. We consider UV perturbative singularities in non-supersymmetric …
gravity and string theory. We consider UV perturbative singularities in non-supersymmetric …