Euclid preparation. Sensitivity to non-standard particle dark matter model

• Main Authors: Euclid Collaboration, Schwagereit, J, Parimbelli, G, Giri, S. K, Schneider, A, Amara, A, Auricchio, N, Bodendorf, C, Brescia, M, Camera, S, Carretero, J, Castellano, M, Conselice, C. J, Conversi, L, Courbin, F, Courtois, H. M, Dubath, F, Dusini, S, Farrens, S, Fosalba, P, Frailis, M, Fumana, M, Guzzo, L, Haugan, S. V. H, Joachimi, B, Lilje, P. B, Maino, D, Mansutti, O, Marggraf, O, Marulli, F, Medinaceli, E, Mellier, Y, Merlin, E, Meylan, G, Moscardini, L, Munari, E, Nakajima, R, Niemi, S. -M, Nightingale, J. W, Pasian, F, Pedersen, K, Percival, W. J, Poncet, M, Rebolo, R, Renzi, A, Riccio, G, Sánchez, A. G, Scaramella, R, Sefusatti, E, Seidel, G, Tallada-Crespí, P, Toledo-Moreo, R, Wang, Y, Zucca, E, Biviano, A, Boucaud, A, Bozzo, E, Calabrese, M, Fabbian, G, Mauri, N, Nucita, A. A, Akrami, Y, Anselmi, S, Blot, L, Böhringer, H, Calabro, A, Cappi, A, Cooray, A. R, Ferreira, P. G, Ferrero, I, Fornari, F, Gabarra, L, García-Bellido, J, Giacomini, F, Gozaliasl, G, Hildebrandt, H, Hjorth, J, Munñoz, A. Jimenez, Kansal, V, Kirkpatrick, C. C, Loureiro, A, Macias-Perez, J, Magliocchetti, M, Maoli, R, Martins, C. J. A. P, Metcalf, R. B, Moretti, C, Morgante, G, Nadathur, S, Walton, Nicholas A, Patrizii, L, Popa, V, Reimberg, P, Risso, I, Rocci, P. -F, Sereno, M, Simon, P, Tosi, S, Vergani, D, Verza, G
• Format: Journal Article
• Language: English
• Published: 26-06-2024
• Subjects: Physics - Cosmology and Nongalactic Astrophysics
• DOI: 10.48550/arxiv.2406.18274

The Euclid mission of the European Space Agency will provide weak
gravitational lensing and galaxy clustering surveys that can be used to
constrain the standard cosmological model and its extensions, with an
opportunity to test the properties of dark matter beyond the minimal cold dark
matter paradigm. We present forecasts from the combination of these surveys on
the parameters describing four interesting and representative non-minimal dark
matter models: a mixture of cold and warm dark matter relics; unstable dark
matter decaying either into massless or massive relics; and dark matter
experiencing feeble interactions with relativistic relics. We model these
scenarios at the level of the non-linear matter power spectrum using emulators
trained on dedicated N-body simulations. We use a mock Euclid likelihood to fit
mock data and infer error bars on dark matter parameters marginalised over
other parameters. We find that the Euclid photometric probe (alone or in
combination with CMB data from the Planck satellite) will be sensitive to the
effect of each of the four dark matter models considered here. The improvement
will be particularly spectacular for decaying and interacting dark matter
models. With Euclid, the bounds on some dark matter parameters can improve by
up to two orders of magnitude compared to current limits. We discuss the
dependence of predicted uncertainties on different assumptions: inclusion of
photometric galaxy clustering data, minimum angular scale taken into account,
modelling of baryonic feedback effects. We conclude that the Euclid mission
will be able to measure quantities related to the dark sector of particle
physics with unprecedented sensitivity. This will provide important information
for model building in high-energy physics. Any hint of a deviation from the
minimal cold dark matter paradigm would have profound implications for
cosmology and particle physics.