Browsing by Subject "Relativitat (Física)"
Now showing items 1-20 of 30
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Agujeros negros: espacio-tiempo al límite
(2014-10-01)
Audiovisual
Open Access -
Bouncing cosmologies via modified gravity in the ADM formalism: Application to loop quantum cosmology
(American Physical Society (APS), 2018-03-15)
Article
Open AccessWe consider the Arnowitt-Deser-Misner formalism as a tool to build bouncing cosmologies. In this approach, the foliation of the spacetime has to be fixed in order to go beyond general relativity modifying the gravitational ... -
Carbon-oxygen ultra-massive white dwarfs in general relativity
(Oxford University Press, 2023-08-01)
Article
Open AccessWe employ the La Plata stellar evolution code, lpcode, to compute the first set of constant rest-mass carbon–oxygen ultra-massive white dwarf evolutionary sequences for masses higher than 1.29 M¿ that fully take into account ... -
Cosmological perturbations in a class of fully covariant modified theories: application to models with the same background as standard LQC
(Springer, 2018-09-01)
Article
Open AccessBouncing cosmologies are obtained by adding to the Einstein–Hilbert action a term of the form -g---vf(¿), with ¿ a scalar depending on the Hubble parameter only, not on its derivatives, and which is here shown to arise ... -
Discurs d'obertura. VII Jornada de Divulgació de Relativitat
(2014-02-22)
Audiovisual
Open Access -
Discurs d'obertura. VII Jornada de Divulgació de Relativitat
(2014-02-22)
Audiovisual
Open Access -
Einstein a Catalunya 1923
(2014-02-22)
Audiovisual
Open Access -
Einstein y el Quijote
(2016-02-10)
Audiovisual
Open Access¿Hubo alguna conexión entre Albert Einstein y don Qujote de la Mancha? La hubo y, además, tuvo cierta relevancia en la trayectoria vital del padre de la relatividad. De todo lo cual tratará esta conferencia. -
Extended Galilean symmetries of non-relativistic strings
(2017-02-09)
Article
Open AccessWe consider two non-relativistic strings and their Galilean symmetries. These strings are obtained as the two possible non-relativistic (NR) limits of a relativistic string. One of them is non-vibrating and represents a ... -
Formulació relativista de les equacions de posicionament del sistema GPS
(Universitat Politècnica de Catalunya, 2008-11-17)
Master thesis (pre-Bologna period)
Open Access -
Griffiths variational multisymplectic formulation for Lovelock gravity
(2020-08-24)
Article
Open AccessThis work is mainly devoted to constructing a multisymplectic description of Lovelock’s gravity, which is an extension of General Relativity. We establish the Griffiths variational problem for the Lovelock Lagrangian, ... -
La relatividad general
(2016-01)
Article
Open Access -
La matèria fosca i les seves alternatives o un cas d'hipòtesi pendent de confirmació
(2014-02-22)
Audiovisual
Open Access -
Note on bouncing backgrounds
(American Physical Society (APS), 2018-05-15)
Article
Open AccessThe theory of inflation is one of the fundamental and revolutionary developments of modern cosmology that became able to explain many issues of the early Universe in the context of the standard cosmological model (SCM). ... -
On the meaning of Painlevé–Gullstrand synchronization
(2015-11-19)
Article
Open AccessFollowing on from two recent papers, here we examine the relationship between Newtonian gravitation and general relativity in more depth. This allows us to define a scalar potential which is just the proper time of the ... -
Paradojas, valga la redundancia
(2000-03)
Article
Open Access -
Partículas huérfanas
(1997-11)
Article
Open Access -
Pulsar-based Navigation
(2014-10-10)
Research report
Open Access -
Qualitative study in loop quantum cosmology
(2017-12-07)
Article
Open AccessThis work contains a detailed qualitative analysis, in general relativity and in loop quantum cosmology, of the dynamics in the associated phase space of a scalar field minimally coupled with gravity, whose potential mimics ... -
La relativitat en el nostre univers
(2009-11-17)
Audiovisual
Open Access