scholarly journals Time-varying fine structure constant from naturally ultralight dark matter

2021 ◽  
Vol 104 (7) ◽  
Author(s):  
Dawid Brzeminski ◽  
Zackaria Chacko ◽  
Abhish Dev ◽  
Anson Hook
Keyword(s):  
Dark Matter ◽  
Fine Structure ◽  
Structure Constant ◽  
Fine Structure Constant ◽  
Time Varying

scholarly journals Early-universe constraints on a time-varying fine structure constant

2001 ◽  
Vol 64 (10) ◽  
Author(s):  
P. P. Avelino ◽  
S. Esposito ◽  
G. Mangano ◽  
C. J. A. P. Martins ◽  
A. Melchiorri ◽  
...  
Keyword(s):  
Fine Structure ◽  
Early Universe ◽  
Structure Constant ◽  
Fine Structure Constant ◽  
Time Varying

scholarly journals Time-Varying Fine-Structure Constant Requires Cosmological Constant

2019 ◽  
Author(s):  
Rainer Kühne
Keyword(s):  
Fine Structure ◽  
Cosmological Constant ◽  
Structure Constant ◽  
Preliminary Evidence ◽  
Fine Structure Constant ◽  
Time Varying ◽  
De Sitter ◽  
Sitter Universe ◽  
De Sitter Universe

Webb et al. presented preliminary evidence for a time-varying fine-structure constant. We show Teller's formula for this variation to be ruled out within the Einstein-de Sitter universe, however, it is compatible with cosmologies which require a large cosmological constant.

scholarly journals New bounds on dark matter coupling from a global network of optical atomic clocks

2018 ◽  
Vol 4 (12) ◽  
pp. eaau4869 ◽  
Author(s):  
P. Wcisło ◽  
P. Ablewski ◽  
K. Beloy ◽  
S. Bilicki ◽  
M. Bober ◽  
...  
Keyword(s):  
Dark Matter ◽  
Fine Structure ◽  
Cold Atoms ◽  
Atomic Clock ◽  
Structure Constant ◽  
Global Network ◽  
Fine Structure Constant ◽  
Atomic Clocks ◽  
Massive Scalar Field ◽  
Transient Variations

We report on the first Earth-scale quantum sensor network based on optical atomic clocks aimed at dark matter (DM) detection. Exploiting differences in the susceptibilities to the fine-structure constant of essential parts of an optical atomic clock, i.e., the cold atoms and the optical reference cavity, we can perform sensitive searches for DM signatures without the need for real-time comparisons of the clocks. We report a two orders of magnitude improvement in constraints on transient variations of the fine-structure constant, which considerably improves the detection limit for the standard model (SM)–DM coupling. We use Yb and Sr optical atomic clocks at four laboratories on three continents to search for both topological defect and massive scalar field candidates. No signal consistent with a DM coupling is identified, leading to considerably improved constraints on the DM-SM couplings.

scholarly journals Search for transient variations of the fine structure constant and dark matter using fiber-linked optical atomic clocks

2020 ◽  
Vol 22 (9) ◽  
pp. 093010 ◽  
Author(s):  
B M Roberts ◽  
P Delva ◽  
A Al-Masoudi ◽  
A Amy-Klein ◽  
C Bærentsen ◽  
...  
Keyword(s):  
Dark Matter ◽  
Fine Structure ◽  
Structure Constant ◽  
Fine Structure Constant ◽  
Atomic Clocks ◽  
Transient Variations

scholarly journals TIME-VARYING FINE-STRUCTURE CONSTANT REQUIRES COSMOLOGICAL CONSTANT

1999 ◽  
Vol 14 (27) ◽  
pp. 1917-1922 ◽  
Author(s):  
RAINER W. KÜHNE
Keyword(s):  
Fine Structure ◽  
Cosmological Constant ◽  
Structure Constant ◽  
Preliminary Evidence ◽  
Fine Structure Constant ◽  
Time Varying ◽  
De Sitter ◽  
Sitter Universe ◽  
De Sitter Universe

Webb et al. presented preliminary evidence for a time-varying fine-structure constant. We show Teller's formula for this variation to be ruled out within the Einstein–de Sitter universe, however, it is compatible with cosmologies which require a large cosmological constant.

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