Cosmological constraints on Hořava gravity revised in light of GW170817 and GRB170817A and the degeneracy with massive neutrinos

Noemi Frusciante; Micol Benetti

doi:10.1103/physrevd.103.104060

Cosmological constraints from galaxy clustering in the presence of massive neutrinos

Monthly Notices of the Royal Astronomical Society ◽

10.1093/mnras/sty670 ◽

2018 ◽

Vol 477 (1) ◽

pp. 491-506 ◽

Cited By ~ 11

Author(s):

M Zennaro ◽

J Bel ◽

J Dossett ◽

C Carbone ◽

L Guzzo

Keyword(s):

Galaxy Clustering ◽

Cosmological Constraints ◽

Massive Neutrinos

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Cosmology with Thermal Sunyaev Zeldovich Power Spectrum and Cluster Counts: Consistency, Tensions and Prospects

EPJ Web of Conferences ◽

10.1051/epjconf/202022800005 ◽

2020 ◽

Vol 228 ◽

pp. 00005

Author(s):

Boris Bolliet

Keyword(s):

Power Spectrum ◽

Current Status ◽

Apparent Discrepancy ◽

X Ray ◽

Galaxy Surveys ◽

Cosmological Constraints ◽

Mass Bias ◽

Spectrum Measurements ◽

Massive Neutrinos

In this proceeding I summarise the current status of cosmological constraints obtained from current SZ data, focusing on the Planck thermal SZ power spectrum and cluster counts. I discuss the consistency between Planck SZ data and other SZ cluster or galaxy surveys as well as the apparent discrepancy between SZ and CMB for the amplitude of matter clustering σ8. Finally I discuss forecasted constraints on massive neutrinos and the X-ray mass bias in the context of future SZ power spectrum measurements.

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Detecting Cold Dark Matter Candidates

Symposium - International Astronomical Union ◽

10.1017/s0074180900150703 ◽

1987 ◽

Vol 117 ◽

pp. 490-490

Author(s):

A. K. Drukier ◽

K. Freese ◽

D. N. Spergel

Keyword(s):

Dark Matter ◽

Cold Dark Matter ◽

Galactic Halo ◽

Dark Matter Particle ◽

Low Energy ◽

The Sun ◽

Background Rate ◽

System Noise ◽

Weakly Interacting ◽

Massive Neutrinos

We consider the use of superheated superconducting colloids as detectors of weakly interacting galactic halo candidate particles (e.g. photinos, massive neutrinos, and scalar neutrinos). These low temperature detectors are sensitive to the deposition of a few hundreds of eV's. The recoil of a dark matter particle off of a superheated superconducting grain in the detector causes the grain to make a transition to the normal state. Their low energy threshold makes this class of detectors ideal for detecting massive weakly interacting halo particles.We discuss realistic models for the detector and for the galactic halo. We show that the expected count rate (≈103 count/day for scalar and massive neutrinos) exceeds the expected background by several orders of magnitude. For photinos, we expect ≈1 count/day, more than 100 times the predicted background rate. We find that if the detector temperature is maintained at 50 mK and the system noise is reduced below 5 × 10−4 flux quanta, particles with mass as low as 2 GeV can be detected. We show that the earth's motion around the Sun can produce a significant annual modulation in the signal.

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Redshift-space effects in voids and their impact on cosmological tests. Part I: the void size function

Monthly Notices of the Royal Astronomical Society ◽

10.1093/mnras/staa3252 ◽

2020 ◽

Vol 500 (1) ◽

pp. 911-925

Author(s):

Carlos M Correa ◽

Dante J Paz ◽

Ariel G Sánchez ◽

Andrés N Ruiz ◽

Nelson D Padilla ◽

...

Keyword(s):

Theoretical Framework ◽

Real Space ◽

Global Dynamics ◽

Void Size ◽

Spherical Void ◽

Cosmological Constraints ◽

Redshift Surveys ◽

Size Function ◽

Expansion Effect ◽

Space Effects

ABSTRACT Voids are promising cosmological probes. Nevertheless, every cosmological test based on voids must necessarily employ methods to identify them in redshift space. Therefore, redshift-space distortions (RSD) and the Alcock–Paczyński effect (AP) have an impact on the void identification process itself generating distortion patterns in observations. Using a spherical void finder, we developed a statistical and theoretical framework to describe physically the connection between the identification in real and redshift space. We found that redshift-space voids above the shot noise level have a unique real-space counterpart spanning the same region of space, they are systematically bigger and their centres are preferentially shifted along the line of sight. The expansion effect is a by-product of RSD induced by tracer dynamics at scales around the void radius, whereas the off-centring effect constitutes a different class of RSD induced at larger scales by the global dynamics of the whole region containing the void. The volume of voids is also altered by the fiducial cosmology assumed to measure distances, this is the AP change of volume. These three systematics have an impact on cosmological statistics. In this work, we focus on the void size function. We developed a theoretical framework to model these effects and tested it with a numerical simulation, recovering the statistical properties of the abundance of voids in real space. This description depends strongly on cosmology. Hence, we lay the foundations for improvements in current models of the abundance of voids in order to obtain unbiased cosmological constraints from redshift surveys.

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Probing neutrino magnetic moment at the Jinping neutrino experiment

Journal of High Energy Physics ◽

10.1007/jhep08(2021)068 ◽

2021 ◽

Vol 2021 (8) ◽

Author(s):

Baobiao Yue ◽

Jiajun Liao ◽

Jiajie Ling

Keyword(s):

Magnetic Moment ◽

Liquid Scintillator ◽

Solar Neutrinos ◽

Electron Neutrino ◽

Neutrino Experiment ◽

Neutrino Magnetic Moment ◽

Systematic Uncertainties ◽

Electron Recoil ◽

Massive Neutrinos ◽

Highly Correlated

Abstract Neutrino magnetic moment (νMM) is an important property of massive neutrinos. The recent anomalous excess at few keV electronic recoils observed by the XENON1T collaboration might indicate a ∼ 2.2 × 10−11μB effective neutrino magnetic moment ($$ {\mu}_{\nu}^{\mathrm{eff}} $$ μ ν eff ) from solar neutrinos. Therefore, it is essential to carry out the νMM searches at a different experiment to confirm or exclude such a hypothesis. We study the feasibility of doing νMM measurement with 4 kton fiducial mass at Jinping neutrino experiment (Jinping) using electron recoil data from both natural and artificial neutrino sources. The sensitivity of $$ {\mu}_{\nu}^{\mathrm{eff}} $$ μ ν eff can reach < 1.2 × 10−11μB at 90% C.L. with 10-year data taking of solar neutrinos. Besides the abundance of the intrinsic low energy background 14C and 85Kr in the liquid scintillator, we find the sensitivity to νMM is highly correlated with the systematic uncertainties of pp and 85Kr. Reducing systematic uncertainties (pp and 85Kr) and the intrinsic background (14C and 85Kr) can help to improve sensitivities below these levels and reach the region of astrophysical interest. With a 3 mega-Curie (MCi) artificial neutrino source 51Cr installed at Jinping neutrino detector for 55 days, it could give us a sensitivity to the electron neutrino magnetic moment ($$ {\mu}_{\nu_e} $$ μ ν e ) with < 1.1 × 10−11μB at 90% C.L. . With the combination of those two measurements, the flavor structure of the neutrino magnetic moment can be also probed at Jinping.

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On the road to per cent accuracy – III. Non-linear reaction of the matter power spectrum to massive neutrinos

Monthly Notices of the Royal Astronomical Society ◽

10.1093/mnras/stz3189 ◽

2019 ◽

Vol 491 (3) ◽

pp. 3101-3107 ◽

Cited By ~ 4

Author(s):

M Cataneo ◽

J D Emberson ◽

D Inman ◽

J Harnois-Déraps ◽

C Heymans

Keyword(s):

Power Spectrum ◽

Cold Dark Matter ◽

New Physics ◽

Model Reaction ◽

Matter Power Spectrum ◽

Non Linear ◽

Cent Level ◽

Massive Neutrinos ◽

On The Road ◽

Total Matter

ABSTRACT We analytically model the non-linear effects induced by massive neutrinos on the total matter power spectrum using the halo model reaction framework of Cataneo et al. In this approach, the halo model is used to determine the relative change to the matter power spectrum caused by new physics beyond the concordance cosmology. Using standard fitting functions for the halo abundance and the halo mass–concentration relation, the total matter power spectrum in the presence of massive neutrinos is predicted to per cent-level accuracy, out to $k=10 \,{ h}\,{\rm Mpc}^{-1}$. We find that refining the prescriptions for the halo properties using N-body simulations improves the recovered accuracy to better than 1 per cent. This paper serves as another demonstration for how the halo model reaction framework, in combination with a single suite of standard Λ cold dark matter (ΛCDM) simulations, can recover per cent-level accurate predictions for beyond ΛCDM matter power spectra, well into the non-linear regime.

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