期刊
PHYSICAL REVIEW LETTERS
卷 107, 期 1, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.107.021301
关键词
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资金
- U.S. NSF [AST-0408698, PHY-0355328, AST-0707731, PIRE-0507768]
- Princeton University
- University of Pennsylvania
- RCUK
- NASA [NNX08AH30G]
- NSERC
- NSF [AST-0546035, AST-0807790]
- NSF Physics Frontier Center [PHY-0114422]
- KICP
- SLAC [AC3-76SF00515]
- BCCP
- FONDAP
- Basal
- Centre AIUC
- CONICYT
- NASA [101243, NNX08AH30G] Funding Source: Federal RePORTER
- Division Of Astronomical Sciences
- Direct For Mathematical & Physical Scien [0807790] Funding Source: National Science Foundation
- Division Of Astronomical Sciences
- Direct For Mathematical & Physical Scien [0965625] Funding Source: National Science Foundation
We report the first detection of the gravitational lensing of the cosmic microwave background through a measurement of the four-point correlation function in the temperature maps made by the Atacama Cosmology Telescope. We verify our detection by calculating the levels of potential contaminants and performing a number of null tests. The resulting convergence power spectrum at 2 degrees angular scales measures the amplitude of matter density fluctuations on comoving length scales of around 100 Mpc at redshifts around 0.5 to 3. The measured amplitude of the signal agrees with Lambda cold dark matter cosmology predictions. Since the amplitude of the convergence power spectrum scales as the square of the amplitude of the density fluctuations, the 4 sigma detection of the lensing signal measures the amplitude of density fluctuations to 12%.
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