Structured Singular Light Fields

2021 ◽  
Author(s):  
Eileen Otte
Keyword(s):  
Light Fields

Nonuniform Spatial Deformation of Light Fields by Locally Linear Transformations

2017 ◽  
Vol 36 (4) ◽  
pp. 1
Author(s):  
Clemens Birklbauer ◽  
David C. Schedl ◽  
Oliver Bimber
Keyword(s):  
Light Fields ◽  
Linear Transformations ◽  
Spatial Deformation ◽  
Locally Linear

scholarly journals A cosmic microscope for the preheating era

2021 ◽  
Vol 2021 (1) ◽  
Author(s):  
JiJi Fan ◽  
Zhong-Zhi Xianyu
Keyword(s):  
Scalar Field ◽  
Nonlinear Effect ◽  
Large Scale ◽  
Nonlinear Effects ◽  
Light Fields ◽  
Unique Probe ◽  
Light Scalar ◽  
Spatially Varying ◽  
Near Future ◽  
Scalar Perturbations

Abstract Light fields with spatially varying backgrounds can modulate cosmic preheating, and imprint the nonlinear effects of preheating dynamics at tiny scales on large scale fluctuations. This provides us a unique probe into the preheating era which we dub the “cosmic microscope”. We identify a distinctive effect of preheating on scalar perturbations that turns the Gaussian primordial fluctuations of a light scalar field into square waves, like a diode. The effect manifests itself as local non-Gaussianity. We present a model, “modulated partial preheating”, where this nonlinear effect is consistent with current observations and can be reached by near future cosmic probes.

scholarly journals Characterizing ultralow emittance electron beams using structured light fields

2021 ◽  
Vol 24 (1) ◽  
Author(s):  
Andreas Seidel ◽  
Jens Osterhoff ◽  
Matt Zepf
Keyword(s):  
Electron Beams ◽  
Structured Light ◽  
Light Fields

scholarly journals Linear Combinations of the Complex Degrees of Coherence

Photonics ◽  
2021 ◽  
Vol 8 (5) ◽  
pp. 146
Author(s):  
Zhangrong Mei ◽  
Olga Korotkova
Keyword(s):  
Spatial Coherence ◽  
Light Fields ◽  
Linear Combinations

We propose a method for structuring the spatial coherence state of light via mixed linear combinations of N complex degrees of coherence (CDC) and specify the conditions under which such combinations represent a valid CDC. Several examples demonstrate that this method opens previously unknown avenues for modeling random sources, radiating to light fields with unique features.

scholarly journals Wavefunctions in dS/CFT revisited: principal series and double-trace deformations

2021 ◽  
Vol 2021 (4) ◽  
Author(s):  
Hiroshi Isono ◽  
Hoiki Madison Liu ◽  
Toshifumi Noumi
Keyword(s):  
Principal Series ◽  
Light Fields ◽  
Quadratic Term ◽  
De Sitter Spacetime ◽  
Cosmological Horizon ◽  
De Sitter ◽  
Complementary Series ◽  
Point Function ◽  
Sitter Spacetime ◽  
Simple Scaling

Abstract We study wavefunctions of heavy scalars on de Sitter spacetime and their implications to dS/CFT correspondence. In contrast to light fields in the complementary series, heavy fields in the principal series oscillate outside the cosmological horizon. As a consequence, the quadratic term in the wavefunction does not follow a simple scaling and so it is hard to identify it with a conformal two-point function. In this paper, we demonstrate that it should be interpreted as a two-point function on a cyclic RG flow which is obtained by double-trace deformations of the dual CFT. This is analogous to the situation in nonrelativistic AdS/CFT with a bulk scalar whose mass squared is below the Breitenlohner-Freedman (BF) bound. We also provide a new dS/CFT dictionary relating de Sitter two-point functions and conformal two-point functions in the would-be dual CFT.

scholarly journals A Linear Approach to Absolute Pose Estimation for Light Fields

2020 ◽  
Author(s):  
Sotiris Nousias ◽  
Manolis Lourakis ◽  
Pearse Keane ◽  
Sebastien Ourselin ◽  
Christos Bergeles
Keyword(s):  
Pose Estimation ◽  
Light Fields ◽  
Linear Approach

scholarly journals Magnetometry using sodium fluorescence with synchronous modulation of two-photon resonant light fields

2020 ◽  
Vol 117 (21) ◽  
pp. 214002
Author(s):  
Raghwinder Singh Grewal ◽  
Mauricio Pulido ◽  
Gour Pati ◽  
Renu Tripathi
Keyword(s):  
Light Fields ◽  
Two Photon
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