First measurements of high frequency cross-spectra from a pair of large Michelson interferometers
- Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
- Univ. of Michigan, Ann Arbor, MI (United States)
- Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States); Univ. of Chicago, Chicago, IL (United States)
- Univ. of Chicago, Chicago, IL (United States); Vanderbilt Univ., Nashville, TN (United States)
- Univ. of Chicago, Chicago, IL (United States); Korea Advanced Institute of Science and Technology (KAIST), Daejeon (Republic of Korea)
- Univ. of Chicago, Chicago, IL (United States); Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
- Univ. of Chicago, Chicago, IL (United States)
- Space X, Hawthorne, CA (United States)
- Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Here, measurements are reported of the cross-correlation of spectra of differential position signals from the Fermilab Holometer, a pair of colocated 39 m long, high power Michelson interferometers with flat broadband frequency response in the MHz range. The instrument obtains sensitivity to high frequency correlated signals far exceeding any previous measurement in a broad frequency band extending beyond the 3.8 MHz inverse light-crossing time of the apparatus. The dominant but uncorrelated shot noise is averaged down over 2 × 108 independent spectral measurements with 381 Hz frequency resolution to obtain 2.1 × 10-20m/ √Hz sensitivity to stationary signals. For signal bandwidths Δf > 11 kHz, the sensitivity to strain h or shear power spectral density of classical or exotic origin surpasses a milestone PSDδh < tp where tp = 5.39 × 10-44/ Hz is the Planck time.
- Research Organization:
- Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), High Energy Physics (HEP)
- Contributing Organization:
- Holometer Collaboration
- Grant/Contract Number:
- AC02-07CH11359
- OSTI ID:
- 1330368
- Alternate ID(s):
- OSTI ID: 1323572
- Report Number(s):
- FERMILAB-PUB-16-217-AE; PRLTAO; 1486143
- Journal Information:
- Physical Review Letters, Vol. 117, Issue 11; ISSN 0031-9007
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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