Sökning: "Edvard Mörtsell"

Visar resultat 1 - 5 av 9 avhandlingar innehållade orden Edvard Mörtsell.

  1. 1. Light propagation in the universe

    Författare :Edvard Mörtsell; Stockholms universitet; []
    Nyckelord :NATURAL SCIENCES; NATURVETENSKAP;

    Sammanfattning : .... LÄS MER

  2. 2. Inhomogeneous cosmologies with clustered dark energy or a local matter void

    Författare :Michael Blomqvist; Edvard Mörtsell; Pedro Ferreira; Stockholms universitet; []
    Nyckelord :NATURAL SCIENCES; NATURVETENSKAP; NATURVETENSKAP; NATURAL SCIENCES; dark energy; type Ia supernova; inhomogeneous; Cosmology; Kosmologi; Astronomy; astronomi;

    Sammanfattning : In the standard model of cosmology, the universe is currently dominated by dark energy in the form of the cosmological constant that drives the expansion to accelerate. While the cosmological constant hypothesis is consistent with all current data, models with dynamical behaviour of dark energy are still allowed by observations. LÄS MER

  3. 3. Cosmic tests of massive gravity

    Författare :Jonas Enander; Edvard Mörtsell; Stefan Hofmann; Stockholms universitet; []
    Nyckelord :NATURAL SCIENCES; NATURVETENSKAP; NATURVETENSKAP; NATURAL SCIENCES; Modified gravity; massive gravity; cosmology; dark energy; dark matter; Physics; fysik;

    Sammanfattning : Massive gravity is an extension of general relativity where the graviton, which mediates gravitational interactions, has a non-vanishing mass. The first steps towards formulating a theory of massive gravity were made by Fierz and Pauli in 1939, but it took another 70 years until a consistent theory of massive gravity was written down. LÄS MER

  4. 4. Gravitational collapse in bimetric gravity

    Författare :Marcus Högås; Edvard Mörtsell; Tomi Koivisto; Stockholms universitet; []
    Nyckelord :NATURAL SCIENCES; NATURVETENSKAP; NATURVETENSKAP; NATURAL SCIENCES; Bimetric gravity; bigravity; modified gravity; gravitational collapse; Bimetrisk gravitation; modifierad gravitation; gravitationskollaps; Theoretical Physics; teoretisk fysik;

    Sammanfattning : Einstein’s theory of general relativity has been the prevailing theory of classical gravity for over a century. Its observational consistency is unparalleled. There are however a few (arguably) serious short-comings. LÄS MER

  5. 5. Sources of Dust Extinction in Type Ia Supernovae : Measurements and constraints from X-rays to the Infrared

    Författare :Joel Johansson; Edvard Mörtsell; Ariel Goobar; Rahman Amanullah; Bruno Leibundgut; Stockholms universitet; []
    Nyckelord :NATURAL SCIENCES; NATURVETENSKAP; NATURVETENSKAP; NATURAL SCIENCES; supernovae; interstellar dust; circumstellar dust; cosmology; Physics; fysik;

    Sammanfattning : The use of Type Ia supernovae (SNe Ia) as distance indicators is essential for studying the expansion history of the Universe and for exploring the nature of dark energy. However, a lack of understanding of the progenitor systems and the empirically derived colour-brightness corrections represent severe limitations for SNe Ia as cosmological probes. LÄS MER