Multimessenger Cosmology: correlating CMB and SGWB measurements. (arXiv:2004.06619v2 [astro-ph.CO] UPDATED)

<a href="http://arxiv.org/find/astro-ph/1/au:+Adshead_P/0/1/0/all/0/1">Peter Adshead</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Afshordi_N/0/1/0/all/0/1">Niayesh Afshordi</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Dimastrogiovanni_E/0/1/0/all/0/1">Emanuela Dimastrogiovanni</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Fasiello_M/0/1/0/all/0/1">Matteo Fasiello</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Lim_E/0/1/0/all/0/1">Eugene A. Lim</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Tasinato_G/0/1/0/all/0/1">Gianmassimo Tasinato</a>

Characterizing the physical properties of the stochastic gravitational waves

background (SGWB) is a key step towards identifying the nature of its possible

origin. We focus our analysis on SGWB anisotropies. The existence of a

non-trivial primordial scalar-tensor-tensor (STT) correlation in the squeezed

configuration may be inferred from the effect that a long wavelength scalar

mode has on the gravitational wave power spectrum: an anisotropic contribution.

Crucially, such contribution is correlated with temperature anisotropies in the

cosmic microwave background (CMB). We show that, for inflationary models that

generate suitably large STT non-Gaussianities, cross-correlating the CMB with

the stochastic background of gravitational waves is a very effective probe of

early universe physics. The resulting signal can be a smoking-gun for

primordial SGWB anisotropies.

Characterizing the physical properties of the stochastic gravitational waves

background (SGWB) is a key step towards identifying the nature of its possible

origin. We focus our analysis on SGWB anisotropies. The existence of a

non-trivial primordial scalar-tensor-tensor (STT) correlation in the squeezed

configuration may be inferred from the effect that a long wavelength scalar

mode has on the gravitational wave power spectrum: an anisotropic contribution.

Crucially, such contribution is correlated with temperature anisotropies in the

cosmic microwave background (CMB). We show that, for inflationary models that

generate suitably large STT non-Gaussianities, cross-correlating the CMB with

the stochastic background of gravitational waves is a very effective probe of

early universe physics. The resulting signal can be a smoking-gun for

primordial SGWB anisotropies.

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