Daniel Martín de Blas

Hospital General Universitario Gregorio Marañón

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Susanna Carmona

Centro de Investigación Biomédica en Red de Salud Mental

Alberto Fernández‐Pena

Universidad Carlos III de Madrid

Manuel Desco

Universidad Carlos III de Madrid

Guillermo A. Mena Marugán

Instituto de Estructura de la Materia

Luis Marcos‐Vidal

Hospital Del Mar

Javier Olmedo

Universidad de Granada

Francisco J. Navas‐Sánchez

Hospital General Universitario Gregorio Marañón

Magdalena Martínez‐Garcia

University of California, Santa Barbara

Yasser Alemán‐Gómez

University of Lausanne

María Paternina-Die

Hospital General Universitario Gregorio Marañón

Cooperative Institutions

Centre National de la Recherche Scientifique

Universitat Autònoma de Barcelona

Hospital General Universitario Gregorio Marañón

Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali del Gran Sasso

Istituto Nazionale di Fisica Nucleare

Sorbonne Université

Istituto Nazionale di Fisica Nucleare, Sezione di Napoli

University of L'Aquila

Institut National de Physique Nucléaire et de Physique des Particules

Centro de Investigación Biomédica en Red de Salud Mental

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A closer look to initial data for cosmological perturbations

Daniel Martín de Blas

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Unitary Evolution and Uniqueness of the Fock Quantization in Flat Cosmologies with Compact Spatial Sections

Electronic journal of theoretical physics (2014)

Laura Castelló Gomar Jerónimo Cortez Daniel Martín de Blas Guillermo A. Mena Marugán José M. Velhinho

We acknowledge financial aid from the research grants MICINN/MINECO FIS2011-30145- C03-02 from Spain, CERN/FP/116373/2010.

Fock state

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Quantum gravity phenomenology at the dawn of the multi-messenger era -- A review.

arXiv (Cornell University) (2021)

Andrea Addazi J. Álvarez-Muñiz Rafael Alves Batista Giovanni Amelino-Camelia V. Antonelli

The exploration of the universe has recently entered a new era thanks to the multi-messenger paradigm, characterized by a continuous increase in the quantity and quality of experimental data that is obtained by the detection of the various cosmic messengers (photons, neutrinos, cosmic rays and gravitational waves) from numerous origins. They give us information about their sources in the universe and the properties of the intergalactic medium. Moreover, multi-messenger astronomy opens up the possibility to search for phenomenological signatures of quantum gravity. On the one hand, the most energetic events allow us to test our physical theories at energy regimes which are not directly accessible in accelerators; on the other hand, tiny effects in the propagation of very high energy particles could be amplified by cosmological distances. After decades of merely theoretical investigations, the possibility of obtaining phenomenological indications of Planck-scale effects is a revolutionary step in the quest for a quantum theory of gravity, but it requires cooperation between different communities of physicists (both theoretical and experimental). This review is aimed at promoting this cooperation by giving a state-of-the art account of the interdisciplinary expertise that is needed in the effective search of quantum gravity footprints in the production, propagation and detection of cosmic messengers.

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The mass of cosmological perturbations in Loop Quantum Cosmology

The Fifteenth Marcel Grossmann Meeting (2022)

Guillermo A. Mena Marugán Daniel Martín de Blas Beatriz Elizaga de Navascés

Loop Quantum Cosmology

10.1142/9789811258251_0303

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Primordial power spectra for scalar perturbations in loop quantum cosmology

Journal of Cosmology and Astroparticle Physics (2016)

Daniel Martín de Blas Javier Olmedo

We provide the power spectrum of small scalar perturbations propagating in an inflationary scenario within loop quantum cosmology.We consider the hybrid quantization approach applied to a Friedmann-Robertson-Walker spacetime with flat spatial sections coupled to a massive scalar field.We study the quantum dynamics of scalar perturbations on an effective background within this hybrid approach.We consider in our study adiabatic states of different orders.For them, we find that the hybrid quantization is in good agreement with the predictions of the dressed metric approach.We also propose an initial vacuum state for the perturbations, and compute the primordial and the anisotropy power spectrum in order to qualitatively compare with the current observations of Planck mission.We find that our vacuum state is in good agreement with them, showing a suppression of the power spectrum for large scale anisotropies.We compare with other choices already studied in the literature.

Loop Quantum Cosmology

Quantum fluctuation

Primordial fluctuations

Cosmological perturbation theory

10.1088/1475-7516/2016/06/029

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Primordial power spectra in loop quantum cosmology

Daniel Martín de Blas

Presentacion de 38 diapositivas. -- Univerzita Karlova, Prague, Czech Republic, June 29th, 2017

Loop Quantum Cosmology

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Local rotational symmetry Gowdy model in loop quantum gravity

Javier Olmedo Daniel Martín de Blas Tomasz Pawłowski

10.1142/9789813226609_0539

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Herramientas numéricas I y II, Espectros de potencia primordiales para perturbaciones cosmológicas I y II, y Códigos de Boltzmann e inferencia (CLASS y MontePython).

Daniel Martín de Blas

Boltzmann constant

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Local Functional Connectivity as a Parsimonious Explanation of the Main Frameworks for ADHD in Medication-Naïve Adults

Journal of Attention Disorders (2022)

Luis Marcos‐Vidal Magdalena Martínez‐Garcia Daniel Martín de Blas Francisco J. Navas‐Sánchez Clara Pretus

Objective: Neuroimaging studies in children with ADHD indicate that their brain exhibits an atypical functional connectivity pattern characterized by increased local connectivity and decreased distant connectivity. We aim to evaluate if the local and distant distribution of functional connectivity is also altered in adult samples with ADHD who have never received medication before. Methods: We compared local and distant functional connectivity between 31 medication-naïve adults with ADHD and 31 healthy controls and tested whether this pattern was associated with symptoms severity scores. Results: ADHD sample showed increased local connectivity in the dACC and the SFG and decreased local connectivity in the PCC. Conclusion: Results parallel those obtained in children samples suggesting a deficient integration within the DMN and segregation between DMN, FPN, and VAN. These results are consistent with the three main frameworks that explain ADHD: the neurodevelopmental delay hypothesis, the DMN interference hypothesis, and multi-network models.

10.1177/10870547221101646

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Women’s neuroplasticity during gestation, childbirth and postpartum

Nature Neuroscience (2024)

María Paternina-Die Magdalena Martínez‐Garcia Daniel Martín de Blas Inés Noguero-Soler Camila Servin-Barthet

Pregnancy is a unique neuroplastic period in adult life. This longitudinal study tracked brain cortical changes during the peripartum period and explored how the type of childbirth affects these changes. We collected neuroanatomic, obstetric and neuropsychological data from 110 first-time mothers during late pregnancy and early postpartum, as well as from 34 nulliparous women evaluated at similar time points. During late pregnancy, mothers showed lower cortical volume than controls across all functional networks. These cortical differences attenuated in the early postpartum session. Default mode and frontoparietal networks showed below-expected volume increases during peripartum, suggesting that their reductions may persist longer. Results also pointed to different cortical trajectories in mothers who delivered by scheduled C-section. The main findings were replicated in an independent sample of 29 mothers and 24 nulliparous women. These data suggest a dynamic trajectory of cortical decreases during pregnancy that attenuates in the postpartum period, at a different rate depending on the brain network and childbirth type.

10.1038/s41593-023-01513-2

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Citations (24)