Galaxy imaging surveys as spin-sensitive detector for cosmological colliders

Kogai, Kazuhiro; Akitsu, Kazuyuki; Schmidt, Fabian; Urakawa, Yuko

doi:10.48550/arxiv.2009.05517

Cited by 3 publications

(3 citation statements)

References 112 publications

(75 reference statements)

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“…[15][16][17] with the kinetic coupling I(φ)F µν F µν was generalized to discuss the generation of general integer spin fields through the kinetic coupling with the inflaton as a framework of cosmological collider physics [30][31][32]. The imprints of these non-zero spin fields encoded in the primordial curvature perturbation might be detectable from measurements of CMB [33][34][35][36] and LSS [37][38][39][40][41][42].…”

Section: Introductionmentioning

confidence: 99%

Anisotropic separate universe and Weinberg's adiabatic mode

Tanaka,

Urakawa

2021

Preprint

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In the separate universe approach, an inhomogeneous universe is rephrased as a set of glued numerous homogeneous local patches. This is the essence of the gradient expansion and the δN formalism, which have been widely used in solving a long wavelength evolution of the universe. In this paper, we show that the separate universe approach can be generically used, as long as a theory under consideration is local and preserves the spatial diffeomorphism invariance. Focusing on these two conditions, we also clarify the condition for the existence of the so-called Weinberg's adiabatic mode. Remarkably, the separate universe approach and the δN formalism turn out to be applicable also to models with shear on large scales and also to modified theories of gravity, accepting violation of four-dimensional diffeomorphism invariance. The generalized δN formalism enables us to calculate all the large scale fluctuations, including gravitational waves. We also argue several implications on anisotropic inflation and ultra slow-roll inflation.

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Section: Introductionmentioning

confidence: 99%

Anisotropic separate universe and Weinberg's adiabatic mode

Tanaka,

Urakawa

2021

Preprint

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“…These couplings can then naturally result in efficient particle production for masses up to λ H. 3 We will study the case of O(χ, χ † ) with q = 1 and show that it can lead to striking NG signatures of the heavy scalars, the largest and the most theoretically tractable occurring via tree-level exchanges with the inflaton. These can be readily observable in upcoming LSS experiments [6,[49][50][51] and future 21-cm cosmology [52,53]. We will also briefly study the case q = 2, which is mostly closely analogous to the fermionic case.…”

Section: Introductionmentioning

confidence: 99%

The Scalar Chemical Potential in Cosmological Collider Physics

Bodas,

Kumar,

Sundrum

2020

Preprint

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Non-analyticity in co-moving momenta within the non-Gaussian bispectrum is a distinctive sign of on-shell particle production during inflation, presenting a unique opportunity for the "direct detection" of particles with masses as large as the inflationary Hubble scale (H). However, the strength of such non-analyticity ordinarily drops exponentially by a Boltzmann-like factor as masses exceed H. In this paper, we study an exception provided by a dimension-5 derivative coupling of the inflaton to heavy-particle currents, applying it specifically to the case of two real scalars. The operator has a "chemical potential" form, which harnesses the large kinetic energy scale of the inflaton, φ1/2 0 ≈ 60H, to act as an efficient source of scalar particle production. Derivative couplings of inflaton ensure radiative stability of the slow-roll potential, which in turn maintains (approximate) scale-invariance of the inflationary correlations. We show that a signal not suffering Boltzmann suppression can be obtained in the bispectrum with strength f NL ∼ O(0.01 − 10) for an extended range of scalar masses, M φ1/2 0 , potentially as high as 10 15 GeV, within the sensitivity of upcoming LSS and more futuristic 21-cm experiments. The mechanism does not invoke any particular fine-tuning of parameters or breakdown of perturbation-theoretic control. The leading contribution appears at tree-level, which makes the calculation analytically tractable and removes the loop-suppression as compared to earlier chemical potential studies of non-zero spins. The steady particle production allows us to infer the effective mass of the heavy particles and the chemical potential from the variation in bispectrum oscillations as a function of co-moving momenta. Our analysis sets the stage for generalization to heavy bosons with non-zero spin.

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“…Besides, the information on individual shapes and orientations of galaxy images, previously treated as a contaminant in weak lensing data analyses (Heavens et al 2000;Croft & Metzler 2000;Crittenden et al 2002;Hirata & Seljak 2004;Mandelbaum et al 2006;Hirata et al 2007;, has recently attracted much attention, and is considered as a beneficial cosmological probe. There are numerous works developed on the formalism and theoretical predictions of the galaxy intrinsic alignment (IA) statistics not only in the projected sky defined on two-dimensional celestial sphere (Catelan et al 2001;Heavens et al 2000;Hirata & Seljak 2004;Schmidt et al 2015;Kogai et al 2018;Biagetti & Orlando 2020;Kogai et al 2020;Vlah et al 2020a), but also in the three-dimensional configuration or Fourier space (Crittenden et al 2002;Schmidt & Jeong 2012;Okumura et al 2019;Vlah et al 2020b;Akitsu et al 2020b). Moreover, several studies have forecasted the constraints on key cosmological parameters such as the dark energy ★ E-mail: shiraishi-m@t.kagawa-nct.ac.jp equation-of-state parameters and the parameters related to the early Universe, and found a substantial improvement on their precision and/or detectability when combining the IA statistics (Chisari & Dvorkin 2013;Schmidt et al 2015;Chisari et al 2016;Kogai et al 2018;Akitsu et al 2020a).…”

Section: Introductionmentioning

confidence: 99%

Wide-angle effects on galaxy ellipticity correlations

Shiraishi,

Taruya,

Okumura

et al. 2020

Preprint

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We show an efficient way to compute wide-angle or all-sky statistics of galaxy intrinsic alignment in three-dimensional configuration space. For this purpose, we expand the two-point correlation function using a newly introduced spin-dependent tripolar spherical harmonic basis. Therefore, the angular dependences on the two line-of-sight (LOS) directions pointing to each pair of objects, which are degenerate with each other in the conventional analysis under the small-angle or plane-parallel (PP) approximation, are unambiguously decomposed. By means of this, we, for the first time, compute the wide-angle auto and cross correlations between intrinsic ellipticities, number densities and velocities of galaxies, and compare them with the PP-limit results. For the ellipticity-ellipticity and density-ellipticity correlations, we find more than 10% deviation from the PP-limit results if the opening angle between two LOS directions exceeds 30 • − 50 • . It is also shown that even if the PP-limit result is strictly zero, the non-vanishing correlation is obtained over the various scales, arising purely from the curved-sky effects. Our results indicate the importance of the data analysis not relying on the PP approximation in order to determine the cosmological parameters more precisely and/or find new physics via ongoing and forthcoming wide-angle galaxy surveys.

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Galaxy imaging surveys as spin-sensitive detector for cosmological colliders

Cited by 3 publications

References 112 publications

Anisotropic separate universe and Weinberg's adiabatic mode

Anisotropic separate universe and Weinberg's adiabatic mode

The Scalar Chemical Potential in Cosmological Collider Physics

Wide-angle effects on galaxy ellipticity correlations

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