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Vaillon, P. Valageas, I. Valdes, E. A. Valentijn, L. Valenziano, C. Valieri, J. Valiviita, M. Van den Broeck, T. Vassallo, R. Vavrek, J. Vega-Ferrero, B. Venemans, A. Venhola, S. Ventura, G. Verdoes Kleijn, D. Vergani, A. Verma, F. Vernizzi, A. Veropalumbo, G. Verza, C. Vescovi, D. Vibert, M. Viel, P. Vielzeuf, C. Viglione, A. Viitanen, F. Villaescusa-Navarro, S. Vinciguerra, F. Visticot, K. Voggel, M. von Wietersheim-Kramsta, W. J. Vriend, S. Wachter, M. Walmsley, G. Walth, D. M. Walton, N. A. Walton, M. Wander, L. Wang, Y. Wang, J. R. Weaver, J. Weller, M. Wetzstein, D. J. Whalen, I. H. Whittam, A. Widmer, M. Wiesmann, J. Wilde, O. R. Williams, H.-A. Winther, A. Wittje, J. H. W. Wong, A. H. Wright, V. Yankelevich, H. W. Yeung, M. Yoon, S. Youles, L. Y. A. Yung, A. Zacchei, L. Zalesky, G. Zamorani, A. Zamorano Vitorelli, M. Zanoni Marc, M. Zennaro, F. M. Zerbi, I. A. Zinchenko, J. Zoubian, E. Zucca, M. Zumalacarregui Astronomy and Astrophysics, 2025 The current standard model of cosmology successfully describes a variety of measurements, but the nature of its main ingredients, dark matter and dark energy, remains unknown. Euclid is a medium-class mission in the Cosmic Vision 2015–2025 programme of the European Space Agency (ESA) that will provide high-resolution optical imaging, as well as near-infrared imaging and spectroscopy, over about 14 000 deg2 of extragalactic sky. In addition to accurate weak lensing and clustering measurements that probe structure formation over half of the age of the Universe, its primary probes for cosmology, these exquisite data will enable a wide range of science. This paper provides a high-level overview of the mission, summarising the survey characteristics, the various data-processing steps, and data products. We also highlight the main science objectives and expected performance.
Euclid: Constraining linearly scale-independent modifications of gravity with the spectroscopic and photometric primary probes* N. Frusciante, F. Pace, V. F. Cardone, S. Casas, I. Tutusaus, M. Ballardini, E. Bellini, G. Benevento, B. Bose, P. Valageas, N. Bartolo, P. Brax, P. G. Ferreira, F. Finelli, K. Koyama, L. Legrand, L. Lombriser, D. Paoletti, M. Pietroni, A. Rozas-Fernández, Z. Sakr, A. Silvestri, F. Vernizzi, H. A. Winther, N. Aghanim, L. Amendola, N. Auricchio, R. Azzollini, M. Baldi, D. Bonino, E. Branchini, M. Brescia, J. Brinchmann, S. Camera, V. Capobianco, C. Carbone, J. Carretero, M. Castellano, S. Cavuoti, A. Cimatti, R. Cledassou, G. Congedo, L. Conversi, Y. Copin, L. Corcione, F. Courbin, M. Cropper, A. Da Silva, H. Degaudenzi, J. Dinis, F. Dubath, X. Dupac, S. Dusini, S. Farrens, S. Ferriol, P. Fosalba, M. Frailis, E. Franceschi, S. Galeotta, B. Gillis, C. Giocoli, A. Grazian, F. Grupp, L. Guzzo, S. V. H. Haugan, W. Holmes, F. Hormuth, A. Hornstrup, K. Jahnke, S. Kermiche, A. Kiessling, M. Kilbinger, T. Kitching, M. Kunz, H. Kurki-Suonio, S. Ligori, P. B. Lilje, I. Lloro, E. Maiorano, O. Mansutti, O. Marggraf, K. Markovic, F. Marulli, R. Massey, E. Medinaceli, M. Meneghetti, G. Meylan, M. Moresco, L. Moscardini, E. Munari, S. M. Niemi, J. Nightingale, C. Padilla, S. Paltani, F. Pasian, K. Pedersen, W. J. Percival, V. Pettorino, G. Polenta, M. Poncet, L. Popa, F. Raison, R. Rebolo, A. Renzi, J. Rhodes, G. Riccio, E. Romelli, R. Saglia, D. Sapone, B. Sartoris, A. Secroun, G. Seidel, C. Sirignano, G. Sirri, L. Stanco, C. Surace, P. Tallada-Crespí, A. N. Taylor, I. Tereno, R. Toledo-Moreo, F. Torradeflot, E. A. Valentijn, L. Valenziano, T. Vassallo, G. A. Verdoes Kleijn, Y. Wang, A. Zacchei, G. Zamorani, J. Zoubian, V. Scottez Astronomy and Astrophysics, 2024 Context. The future Euclid space satellite mission will offer an invaluable opportunity to constrain modifications to Einstein’s general relativity at cosmic scales. In this paper, we focus on modified gravity models characterised, at linear scales, by a scale-independent growth of perturbations while featuring different testable types of derivative screening mechanisms at smaller non-linear scales. Aims. We considered three specific models, namely Jordan-Brans-Dicke, a scalar-tensor theory with a flat potential, the normal branch of Dvali-Gabadadze-Porrati (nDGP) gravity, a braneworld model in which our Universe is a four-dimensional brane embedded in a five-dimensional Minkowski space-time, and k-mouflage gravity, an extension of k-essence scenarios with a universal coupling of the scalar field to matter. In preparation for real data, we provide forecasts from spectroscopic and photometric primary probes by Euclid on the cosmological parameters and the additional parameters of the models, respectively, ωBD, Ωгc and ϵ2,0, which quantify the deviations from general relativity. This analysis will improve our knowledge of the cosmology of these modified gravity models. Methods. The forecast analysis employs the Fisher matrix method applied to weak lensing (WL); photometric galaxy clustering (GCph), spectroscopic galaxy clustering (GCsp) and the cross-correlation (XC) between GCph and WL. For the Euclid survey specifications, we define three scenarios that are characterised by different cuts in the maximum multipole and wave number, to assess the constraining power of non-linear scales. For each model we considered two fiducial values for the corresponding model parameter. Results. In an optimistic setting at 68.3% confidence interval, we find the following percentage relative errors with Euclid alone: for log10 ωBD, with a fiducial value of ωBD = 800, 27.1% using GCsp alone, 3.6% using GCph+WL+XC and 3.2% using GCph+WL+XC+GCsp; for log10 Ωгc, with a fiducial value of Ωгc = 0.25, we find 93.4, 20 and 15% respectively; and finally, for ϵ2,0 = −0.04, we find 3.4%, 0.15%, and 0.14%. From the relative errors for fiducial values closer to their ΛCDM limits, we find that most of the constraining power is lost. Our results highlight the importance of the constraining power from non-linear scales.
On a Quantum Theory of Relativity Pedro F. González-Díaz, Alberto Rozas-Fernández International Journal of Theoretical Physics, 2017
Cosmological constraints on a unified dark matter-energy scalar field model with fast transition Iker Leanizbarrutia, Alberto Rozas-Fernández, Ismael Tereno Physical Review D, 2017 We test the viability of a single fluid cosmological model containing a transition from a dark-matter-like regime to a dark-energy-like regime. The fluid is a k-essence scalar field with a well-defined Lagrangian. We constrain its model parameters with a combination of geometric probes and conclude that the evidence for this model is similar to the evidence for $\mathrm{\ensuremath{\Lambda}}\mathrm{CDM}$. In addition, we find a lower bound for the rapidity of the transition, implying that fast transitions are favored with respect to slow ones even at background level.
Covariant holography of a tachyonic accelerating universe Alberto Rozas-Fernández European Physical Journal C, 2014 We apply the holographic principle to a flat dark energy dominated Friedmann–Robertson–Walker spacetime filled with a tachyon scalar field with constant equation of state $$w=p/\rho $$ , both for $$w>-1$$ and $$w<-1$$ . By using a geometrical covariant procedure, which allows the construction of holographic hypersurfaces, we have obtained for each case the position of the preferred screen and have then compared these with those obtained by using the holographic dark energy model with the future event horizon as the infrared cutoff. In the phantom scenario, one of the two obtained holographic screens is placed on the big rip hypersurface, both for the covariant holographic formalism and the holographic phantom model. It is also analyzed whether the existence of these preferred screens allows a mathematically consistent formulation of fundamental theories based on the existence of an S-matrix at infinite distances.
A gracious exit from the matter-dominated phase in a quantum cosmic phantom model Pedro F. González-Díaz, Alberto Rozas-Fernández Physics Letters Section B Nuclear Elementary Particle and High Energy Physics, 2014 The most recent observational constraints coming from Planck, when combined with other cosmological data, provide evidence for a phantom scenario. In this work we consider a quantum cosmic phantom model where both the matter particles and scalar field are associated with quantum potentials which make the effective mass associated with the matter particles to vanish at the time of matter-radiation equality, resulting in a cosmic system where a matter dominance phase followed by an accelerating expansion is allowed.
Holographic kinetic k-essence model Norman Cruz, Pedro F. González-Díaz, Alberto Rozas-Fernández, Guillermo Sánchez Physics Letters Section B Nuclear Elementary Particle and High Energy Physics, 2009
Holographic kinetic k-essence cosmologies Norman Cruz, Pedro F. González-Díaz, Alberto Rozas-Fernández, Guillermo Sánchez, Kerstin E. Kunze, Marc Mars, Miguel Angel Vázquez-Mozo Aip Conference Proceedings, 2009
A dark energy multiverse Salvador Robles-Pérez, Prado Martín-Moruno, Alberto Rozas-Fernández, Pedro F González-Díaz Classical and Quantum Gravity, 2007
RECENT SCHOLAR PUBLICATIONS
Euclid. I. Overview of the Euclid mission Y Mellier, A Abdurroúf, JAA Barroso, A Achúcarro, J Adamek, R Adam, ... Astronomy & Astrophysics , 2025 2025 Citations: 744
Kinetic coupled tachyon: A dynamical system analysis F Pace, A Rozas-Fernández, ÖT Türker Physics of the Dark Universe 47, 101786 , 2025 2025 Citations: 2
Euclid. I: Overview of the Euclid mission M Seiffert, E Palazzi, M Saponara, M Szafraniec, A Tsyganov, A Short, ... Astronomy and astrophysics 697 (RWTH-2025-07997), A1 , 2025 2025
Euclid N Null, Y Mellier, N Abdurro'Uf, JA Acevedo Barroso, A Achúcarro, ... ASTRONOMY & ASTROPHYSICS 697 , 2025 2025
Euclid : Constraining linearly scale-independent modifications of gravity with the spectroscopic and photometric primary probes N Frusciante, F Pace, VF Cardone, S Casas, I Tutusaus, M Ballardini, ... Astronomy & Astrophysics 690, A133 , 2024 2024 Citations: 32
Euclid. I Euclid Collaboration, Y Mellier, AB Abdurro’uf, A JA Overview of the Euclid mission 5 , 2024 2024 Citations: 18
Cosmological constraints on a unified dark matter-energy scalar field model with fast transition I Leanizbarrutia, A Rozas-Fernández, I Tereno Physical Review D 96 (2), 023503 , 2017 2017 Citations: 14
Stability and emergence of gravitational waves in the quantum cosmic phantom models A Rozas-Fernández General Relativity and Gravitation 49 (7), 93 , 2017 2017 Citations: 1
Testing cosmological structure formation in Unified Dark Matter-Energy models DML Castelao PQDT-Global , 2017 2017
On a Quantum Theory of Relativity PF González-Díaz, A Rozas-Fernández International Journal of Theoretical Physics, 1-9 , 2017 2017
K-essential covariant holography A Rozas-Fernández General Relativity and Gravitation 46 (12), 1825 , 2014 2014 Citations: 2
Covariant holography of a tachyonic accelerating universe A Rozas-Fernández The European Physical Journal C 74 (8), 3019 , 2014 2014 Citations: 2
A gracious exit from the matter-dominated phase in a quantum cosmic phantom model PF González-Díaz, A Rozas-Fernández Physics Letters B 733, 84-88 , 2014 2014 Citations: 5
Phenomenology of Unified Dark Matter models with fast transition A Rozas-Fernández, M Bruni, R Lazkoz Progress in Mathematical Relativity, Gravitation and Cosmology: Proceedings … , 2013 2013
Phenomenological models for Unified Dark Matter with fast transition M Bruni, R Lazkoz, A Rozas-Fernández Monthly Notices of the Royal Astronomical Society 431 (3), 2907-2916 , 2013 2013 Citations: 30
Kinetic k-essence ghost dark energy model A Rozas-Fernández Physics Letters B 709 (4-5), 313-321 , 2012 2012 Citations: 73
Subquantum accelerating universe PF González-Diaz, A Rozas-Fernández Applied Bohmian Mechanics: From Nanoscale Systems to Cosmology, 507-560 , 2012 2012
Modelos de energía oscura holográfica A Rozas-Fernández Universidad Autónoma de Madrid , 2011 2011
Cosmic models and holography A Rozas Fernández 2011 Citations: 1
MOST CITED SCHOLAR PUBLICATIONS
Euclid. I. Overview of the Euclid mission Y Mellier, A Abdurroúf, JAA Barroso, A Achúcarro, J Adamek, R Adam, ... Astronomy & Astrophysics , 2025 2025 Citations: 744
Kinetic k-essence ghost dark energy model A Rozas-Fernández Physics Letters B 709 (4-5), 313-321 , 2012 2012 Citations: 73
Euclid : Constraining linearly scale-independent modifications of gravity with the spectroscopic and photometric primary probes N Frusciante, F Pace, VF Cardone, S Casas, I Tutusaus, M Ballardini, ... Astronomy & Astrophysics 690, A133 , 2024 2024 Citations: 32
Phenomenological models for Unified Dark Matter with fast transition M Bruni, R Lazkoz, A Rozas-Fernández Monthly Notices of the Royal Astronomical Society 431 (3), 2907-2916 , 2013 2013 Citations: 30
Holographic kinetic k-essence model N Cruz, PF Gonzalez-Diaz, A Rozas-Fernández, G Sánchez Physics Letters B 679 (4), 293-297 , 2009 2009 Citations: 27
Accelerating Hilbert–Einstein universe without dynamic dark energy PF González-Díaz, AR Fernández Physics Letters B 641 (2), 134-138 , 2006 2006 Citations: 21
Euclid. I Euclid Collaboration, Y Mellier, AB Abdurro’uf, A JA Overview of the Euclid mission 5 , 2024 2024 Citations: 18
A dark energy multiverse S Robles-Pérez, P Martin-Moruno, A Rozas-Fernández, ... Classical and Quantum Gravity 24 (10), F41-F45 , 2007 2007 Citations: 16
Quantum cosmic models and thermodynamics PF González-Díaz, A Rozas-Fernández Classical and Quantum Gravity 25 (17), 175023 , 2008 2008 Citations: 15
Cosmological constraints on a unified dark matter-energy scalar field model with fast transition I Leanizbarrutia, A Rozas-Fernández, I Tereno Physical Review D 96 (2), 023503 , 2017 2017 Citations: 14
Interacting holographic tachyon model of dark energy A Rozas-Fernandez, D Brizuela, N Cruz International Journal of Modern Physics D 19 (05), 573-586 , 2010 2010 Citations: 13
Holographic dilatonic dark energy model A Rozas-Fernández The European Physical Journal C 71 (1), 1536 , 2011 2011 Citations: 11
Interacting non-minimally coupled canonical, phantom and quintom models of holographic dark energy in non-flat universe MR Setare, A Rozas-Fernández International Journal of Modern Physics D 19 (12), 1987-2002 , 2010 2010 Citations: 6
A gracious exit from the matter-dominated phase in a quantum cosmic phantom model PF González-Díaz, A Rozas-Fernández Physics Letters B 733, 84-88 , 2014 2014 Citations: 5
Kinetic coupled tachyon: A dynamical system analysis F Pace, A Rozas-Fernández, ÖT Türker Physics of the Dark Universe 47, 101786 , 2025 2025 Citations: 2
K-essential covariant holography A Rozas-Fernández General Relativity and Gravitation 46 (12), 1825 , 2014 2014 Citations: 2
Covariant holography of a tachyonic accelerating universe A Rozas-Fernández The European Physical Journal C 74 (8), 3019 , 2014 2014 Citations: 2
Stability and emergence of gravitational waves in the quantum cosmic phantom models A Rozas-Fernández General Relativity and Gravitation 49 (7), 93 , 2017 2017 Citations: 1
Cosmic models and holography A Rozas Fernández 2011 Citations: 1
On the onset of the dark energy era PF González-Dıaz, A Rozas-Fernández The Problems of Modern Cosmology, 202 , 2008 2008 Citations: 1