scholarly journals On searches for gravitational dark matter with quantum sensors

2019 ◽  
Vol 134 (10) ◽  
Author(s):  
Xavier Calmet
Keyword(s):  
Dark Matter ◽  
Time Variation ◽  
Short Paper ◽  
Atomic Clocks ◽  
Window Of Opportunity ◽  
Effective Time ◽  
Proton Mass

Abstract. The possibility of searching for dark matter with quantum sensors has recently received a lot of attention. In this short paper, we discuss the possibility of searching for gravitational dark matter with quantum sensors and identify a very narrow window of opportunity for future quantum sensors with improved sensitivity. Gravitational dark matter candidates with masses in the range [10-3, 1] eV could lead to an effective time variation of the proton mass that could be measured with, e.g., future atomic clocks.

Chronometric measurements in geodesy and geophysics

2020 ◽  
Author(s):  
Pacôme Delva ◽  
Guillaume Lion
Keyword(s):  
General Relativity ◽  
Dark Matter ◽  
High Spatial Resolution ◽  
Relativistic Effects ◽  
Atomic Clocks ◽  
Fundamental Physics ◽  
Geodynamic Processes ◽  
New Ideas ◽  
Mass Transfers

<p>At the beginning of the 20th century the theories of special and general relativity were developed by Einstein and his contemporaries. These physical theories revolutionize our conceptions of time and of the measurement of time. The atomic clocks, which appeared in the 1950s, are so accurate and stable that it is now essential to take into account many relativistic effects. The development and worldwide comparisons of such atomic clocks allowed for some of the most stringent of fundamental physics, as well as new ideas for the search of dark matter. On a more applied level, when taking general relativity for granted, distant comparisons of atomic clocks can be used for navigation and positioning, as well as the determination of the geopotential. I will show how the chronometric observables can fit and be used within the context of classical geodesy and geophysics, presenting various applications: determination of the geopotential with high spatial resolution, vertical reference system, and discussing the possible applications associated to the geodynamic processes related to mass transfers.</p>

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 Severing Red Alder: Timing the Cut to Achieve the Best Mortality

2003 ◽  
Vol 18 (3) ◽  
pp. 199-201
Author(s):  
Douglas Belz
Keyword(s):  
Air Temperature ◽  
Physical Factors ◽  
Window Of Opportunity ◽  
Red Alder ◽  
Carbohydrate Reserve ◽  
Effective Time ◽  
Calendar Date

Abstract The best time to cut red alder varies. Mortality shifts across regional zones. The most effective time to cut is not determined by calendar date, but instead depends on environmental, biological, and physical factors that affect initial budbreak and potential mortality. Several trials and continuing observations lead the author to believe air temperature and seasonal moisture, along with carbohydrate reserve, are the more potent influences. These influences affect the time to begin cutting, how long cutting can continue, when cutting should stop, and the degree of mortality. Monitoring budbreak date and moisture patterns can be used to determine a favorable window of opportunity that will produce 50% or higher mortality on the cut red alder. The cutting window can be used across wide geoclimatic zones with good success. West. J. Appl. For. 18(3):199–201.

Experimental constraint on dark matter detection with optical atomic clocks

2016 ◽  
Vol 1 (1) ◽  
Author(s):  
P. Wcisło ◽  
P. Morzyński ◽  
M. Bober ◽  
A. Cygan ◽  
D. Lisak ◽  
...  
Keyword(s):  
Dark Matter ◽  
Atomic Clocks ◽  
Experimental Constraint ◽  
Dark Matter Detection ◽  
Matter Detection

scholarly journals Bounds on very weakly interacting ultra light scalar and pseudoscalar dark matter from quantum gravity

2020 ◽  
Vol 80 (8) ◽  
Author(s):  
Xavier Calmet ◽  
Folkert Kuipers
Keyword(s):  
Dark Matter ◽  
Quantum Gravity ◽  
Atomic Clocks ◽  
Weakly Interacting ◽  
Light Scalar ◽  
The Masses ◽  
Matter Sector

Abstract In this paper we consider very weakly interacting and ultra light scalar and pseudoscalar dark matter candidates. We show that quantum gravity has important implications for such models and that the masses of the singlet scalar and pseudoscalar fields must be heavier than $$3\times 10^{-3}$$3×10-3 eV. However, if they are gauged, their masses could be much lighter and as light as $$10^{-22}\, \mathrm{eV}$$10-22eV. The existence of new gauge forces in the dark matter sector can thus be probed by atomic clocks or quantum sensors experiments.

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

Analysis of optical atomic clocks readouts aimed on searches for dark-matter signatures

2018 ◽  
Author(s):  
B. Zjawin ◽  
P. Ablewski ◽  
K. Beloy ◽  
S. Bilicki ◽  
M. Bober ◽  
...  
Keyword(s):  
Dark Matter ◽  
Atomic Clocks
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