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New probes of initial state of quantum fluctuations during inflation

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Brightness, W/m 2 /sr/Hz<br />

3m<br />

4K Black-body<br />

2.725K Black-body<br />

2K Black-body<br />

Rocket (COBRA)<br />

Satellite (COBE/FIRAS)<br />

CN Rotational Transition<br />

Ground-based<br />

Balloon-borne<br />

Satellite (COBE/DMR)<br />

30cm<br />

Using the distortion <strong>of</strong> the thermal<br />

spectrum <strong>of</strong> CMB, we can reach<br />

k3/k1 as small as 10 –8 ! (Pajer &<br />

Zaldarriaga 2012)<br />

Wavelength<br />

(plot from Samtleben et al. 2007)<br />

3mm 0.3mm<br />

40

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