scholarly journals Evolution of the fine structure constant driven by dark matter and the cosmological constant

2002 ◽  
Vol 65 (8) ◽  
Author(s):  
Keith A. Olive ◽  
Maxim Pospelov
Keyword(s):  
Dark Matter ◽  
Fine Structure ◽  
Cosmological Constant ◽  
Structure Constant ◽  
Fine Structure Constant

scholarly journals The large number coincidence, the cosmic coincidence and the critical acceleration

2006 ◽  
Vol 462 (2076) ◽  
pp. 3657-3661 ◽  
Author(s):  
Scott Funkhouser
Keyword(s):  
Fine Structure ◽  
Cosmological Constant ◽  
Scaling Laws ◽  
Structure Constant ◽  
Fine Structure Constant ◽  
Coincidence Problem ◽  
Critical Acceleration ◽  
Physical Connection ◽  
Cosmic Parameters

The coincidence problem among the pure numbers of order near 10 40 is resolved with the Raychaudhuri and Friedmann–Robertson–Lemaitre–Walker equations and a trivial relationship involving the fine structure constant. The fact that the large number coincidence occurs only in the same epoch in which other coincidences among cosmic parameters occur could be considered a distinct coincidence problem suggesting an underlying physical connection. A natural set of scaling laws for the cosmological constant and the critical acceleration is identified that would resolve the coincidence among cosmic coincidences.

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.

CONSTRAINTS ON THE DARK ENERGY EQUATION OF STATE IN PRESENCE OF A VARYING FINE STRUCTURE CONSTANT

2010 ◽  
Vol 19 (04) ◽  
pp. 507-512 ◽  
Author(s):  
E. MENEGONI ◽  
S. PANDOLFI ◽  
S. GALLI ◽  
M. LATTANZI ◽  
A. MELCHIORRI
Keyword(s):  
Fine Structure ◽  
Dark Energy ◽  
Equation Of State ◽  
Cosmological Constant ◽  
Energy Equation ◽  
Structure Constant ◽  
Hubble Constant ◽  
Fine Structure Constant ◽  
Cosmological Constraints ◽  
Energy Models

We discuss the cosmological constraints on the dark energy equation of state in the presence of primordial variations in the fine structure constant. We find that the constraints from CMB data alone on w and the Hubble constant are much weaker when variations in the fine structure constant are permitted. Vice versa, constraints on the fine structure constant are relaxed by more than 50% when dark energy models different from a cosmological constant are considered.

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 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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