Ara es mostren els items 21-40 de 81

    • Design of an expanding cosmological background for the moving punctures approach to numerical relativity 

      Manyer Fuertes, Jordi (Universitat Politècnica de Catalunya, 2019-05-31)
      Treball Final de Grau
      Accés obert
      Realitzat a/amb:   Center for Relativistic Astrophysics
      Gravitational waves astronomy is a new field ushered in by the first detection of a par of merging black holes. Numerical relativity is the only tool capable of solving Einstein’s equations for the the dynamics and resulting ...
    • Different reheating mechanisms in quintessence inflation 

      Haro Cases, Jaume (American Physical Society (APS), 2019-02-11)
      Article
      Accés obert
      Different well-known ways to reheat the Universe, such as instant preheating, the creation of particles nearly or conformally coupled with gravity, or from the decay of products of a curvaton field, are revisited and ...
    • Do old Testament texts substantiate Geocentrism? 

      Pons Poblet, Josep Maria (2020-12-31)
      Article
      Accés obert
      We often read excerpts from the Old Testament that appear to evince an understanding of the Earth as the centre of creation, with the Sun revolving around it. That conception is commonly known as Geocentrism (¿e¿¿e¿t¿¿sµ¿¿), ...
    • El Big Bang i l'Univers primitiu: expansió i abundàncies primordials 

      Farràs Aloy, Sílvia (Universitat Politècnica de Catalunya, 2020-06-22)
      Treball Final de Grau
      Accés obert
      L’objectiu del present treball és l’estudi i caracterització de l’Univers primitiu, mitjançant l’anàlisi d’algunes de les evidències experimentals en què es fonamenta la teoria del Big Bang. El projecte consta de dos blocs ...
    • Evolution and dynamics of a matter creation model 

      Pan, Supriya; Haro Cases, Jaume; Paliathanasis, A.; Slagter, R.J. (2016-05-01)
      Article
      Accés obert
      In a flat Friedmann–Lemaître–Robertson–Walker (FLRW) geometry, we consider the expansion of the universe powered by the gravitationally induced ‘adiabatic’ matter creation. To demonstrate how matter creation works well ...
    • Expectations for the high-energy neutrino detection from starburst galaxies with KM3NeT/ARCA 

      Ageron, M.; Aiello, S; Albert, Arthur; Alshamsi, Mohammed; Alves Garre, Sergio; Aly, Zineb; Ambrosone, Antonio; Ameli, F; André, Michel; Androulakis, Giorgos; Anghinolfi, Marco; Anguita, M. (arXiv, 2021)
      Text en actes de congrés
      Accés obert
      Star-forming galaxies (SFGs) and starburst galaxies (SBGs) are extragalactic sources which could produce high-energy neutrinos. In principle, they could play a rather important role for explaining at least a sizeable part ...
    • Explotaciones mineras en cuerpos celestes 

      Avram, Constantin Nelutu (Universitat Politècnica de Catalunya, 2021-09-15)
      Treball Final de Grau
      Accés obert
      This thesis focuses on the concept of space mining, analysing its current state and, subsequently, comparing it to land-based mining. Defining the negative impacts of traditional mining, such as environmental and social ...
    • Finite-time cosmological singularities and the possible fate of the Universe 

      Haro Cases, Jaume; Nojiri, Shin'ichi; Odintsov, Sergei D.; Oikonomou, Vasilis K.; Pan, Supriya (Elsevier, 2023-09-14)
      Article
      Accés restringit per política de l'editorial
      Singularities in any physical theory are either remarkable indicators of the unknown underlying fundamental theory, or indicate a change in the description of the physical reality. In General Relativity there are three ...
    • Gravitational Particle Production in Massive Chaotic Inflation and the Moduli Problem 

      Haro Cases, Jaume; Elizalde, Emilio (2012-02)
      Article
      Accés restringit per política de l'editorial
      Particle production from vacuum fluctuations during inflation is briefly revisited. The moduli problem occurring with light particles produced at the end of inflation is addressed, namely the fact that some results are in ...
    • High-energy reconstruction for single and double cascades using the KM3NeT detector 

      Ageron, M.; Aiello, S; Alshamsi, Mohammed; Ambrosone, Antonio; André, Michel; Androulakis, Giorgos; Anghinolfi, Marco; Anton, Gisela; Ardid Ramírez, Miguel; Aublin, J.; Bagatelas, Christos (arXiv, 2021)
      Text en actes de congrés
      Accés obert
      The discovery of a high-energy cosmic neutrino flux has paved the way for the field of neutrino astronomy. For a large part of the flux, the sources remain unidentified. The KM3NeT detector, which is under construction in ...
    • Homothetic motions and Newtonian cosmology 

      Jaen Herbera, Javier; Molina Compte, Alfred (2014-05-07)
      Article
      Accés restringit per política de l'editorial
      We construct a homothetic covariant Newtonian gravitation theory which unifies inertial homothetic forces and gravitational fields. This is achieved through an equivalence principle based on a local homothetic frame of ...
    • How can holonomy corrections be introduced in f(R) gravity? 

      Haro Cases, Jaume (2014-07-08)
      Article
      Accés obert
      We study the introduction of holonomy corrections in f(R) gravity. We will show that there are infinitely many ways, as many as canonical transformations, to introduce this kind of corrections, depending on the canonical ...
    • Inflationary potential as seen from different angles: model compatibility from multiple CMB missions 

      Giarè, William; Pan, Supriya; Di Valentino, Eleonora; Yang, Weiqiang; Haro Cases, Jaume; Melchiorri, Alessandro (IOP Publishing, 2023-09)
      Article
      Accés obert
      The cosmic microwave background (CMB) temperature and polarization anisotropies, as observed by independent astronomical missions such as WMAP, Planck, and most recently the Atacama Cosmology Telescope and the South Pole ...
    • KM3NeT/ARCA sensitivity to transient neutrino sources 

      Ageron, M.; Aiello, S; Alshamsi, Mohammed; Ambrosone, Antonio; André, Michel; Androulakis, Giorgos; Anghinolfi, Marco; Anton, Gisela; Ardid Ramírez, Miguel; Aublin, J.; Bagatelas, Christos (arXiv, 2021)
      Text en actes de congrés
      Accés obert
      The KM3NeT Collaboration is constructing a km3 -volume neutrino telescope in the Mediterranean sea, ARCA (Astroparticle Research with Cosmics in the Abyss), for the detection and subsequent study of high-energy cosmic ...
    • La eterna historia 

      Barceló Garcia, Miquel (1995-12)
      Article
      Accés obert
    • Limiting curvature mimetic gravity and its relation to Loop Quantum Cosmology 

      Haro Cases, Jaume; Aresté Saló, Llibert; Pan, Supriya (2019-04-01)
      Article
      Accés obert
      Considering as usual that the underlying geometry of our universe is well described by the spatially flat Friedmann–Lemaître–Robertson–Walker line element, we review how the background of holonomy corrected Loop Quantum ...
    • Massive black hole accretion using Numerical Relativity 

      Gómez Toribio, Pablo (Universitat Politècnica de Catalunya, 2023-05-26)
      Treball Final de Grau
      Accés obert
      Realitzat a/amb:   University of Texas at Austin
      En els darrers anys s’han detectat quàsars amb un desplaçament al vermell z > 7 i masses superiors a 10^9 masses solars (M⊙). L’existència d’objectes tan massius en èpoques tan primerenques de l’univers desafia les teories ...
    • Matter Bounce Scenario in F(T) gravity 

      Haro Cases, Jaume; Amorós Torrent, Jaume (2016)
      Article
      Accés obert
      It is shown that teleparallel F(T) theories of gravity combined with holonomy corrected Loop Quantum Cosmology (LQC) support a Matter Bounce Scenario (MBS) which is a potential alternative to the inflationary paradigm. The ...
    • Modelos cosmológicos en el marco de la teoría general de la relatividad 

      Ribera Manzano, Pablo (Universitat Politècnica de Catalunya, 2016-06-29)
      Treball Final de Grau
      Accés obert
      Detailed work about relativistic cosmology: exposition of the principles and postulates, description of the geometry of spacetime and its matter contents, Hubble's law from a relativistic point of view, analysis of the ...
    • Muon bundle reconstruction with KM3NeT/ORCA using graph convolutional networks 

      Ageron, M.; Aiello, S; Albert, Arthur; Alshamsi, Mohammed; Ambrosone, Antonio; André, Michel; Androulakis, Giorgos; Anghinolfi, Marco; Anton, Gisela; Ardid Ramírez, Miguel; Aublin, J.; Bagatelas, Christos (arXiv, 2021)
      Text en actes de congrés
      Accés obert
      KM3NeT/ORCA is a water-Cherenkov neutrino detector, currently under construction in the Mediterranean Sea at a depth of 2450 meters. The project’s main goal is the determination of the neutrino mass hierarchy by measuring ...