Dr. Ralf Aurich

photo of team member

The focus of my current research is on the cosmic microwave background (CMB) radiation. The fluctuations of the CMB reveal tiny energy density perturbations which act as the seeds for the structure formation leading to the galaxies and galaxy clusters of the present Universe. According to the inflationary scenario these fluctuations arise from quantum fluctuations which freeze in due to the exponential increase of the scale factor which describes the expansion. The correlations of the initial quantum fluctuations are engraved in the correlations of the CMB on the celestial sphere.

My recent work deals with the two-point correlation function of the CMB and its unexpected low power at large angular scales. This could point to a spatial finite universe which possesses naturally such a behaviour since the quantum fluctuations have to fulfill the periodic boundary conditions of the considered space form. The lowest eigenstate of the Laplacian corresponds to the largest scale at which perturbations can imprint a signature on the CMB sky.

Recent publications:

Ralf Aurich on ResearchGate

Most Recent Papers

Efficient construction of matrix-product representations of many-body Gaussian states, Phys. Rev. A 104, 012415 (2021)

One-shot manipulation of entanglement for quantum channels, IEEE Trans. Inf. Theo. 67, 5339 (2021)

Enhanced force sensitivity and entanglement in periodically driven optomechanics, Phys. Rev. A 103, L061501 (2021)



Ulm University
Institute of Theoretical Physics
Albert-Einstein-Allee 11
D - 89069 Ulm

Tel: ++49 / 731 / 50 - 22911
Fax: ++49 / 731 / 50 - 22924

Office: Building M26, room 4117

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