Sökning: "svarta hål"
Visar resultat 1 - 5 av 36 uppsatser innehållade orden svarta hål.
1. Gravitational Collapse of a Massless Scalar Field in a Theory of Minimally Modified Gravity
Master-uppsats, KTH/FysikSammanfattning : This thesis explores the spherically symmetric gravitational collapse of a massless scalar field in a minimally modified gravity theory denoted VCDM (V replaces $\Lambda$ in the $\Lambda$CDM abbreviation), a class of theories propagating the same degrees of freedom as general relativity at the expense of broken 4D diffeomorphism invariance. Numerical evolution of the equations of motion reveals that for small initial scalar profile amplitudes, no black hole forms from the collapse. LÄS MER
2. Cosmological Horizons and the Unruh Effect
L3-uppsats, Uppsala universitet/Teoretisk fysikSammanfattning : The black hole information paradox, which states that the evaporation of black holes due to Hawking radiation results in a violation of the conservation of quantum information, is arguably one of the most fundamental problems in all of modern physics. Through the equivalence principle, the essence of the problem can be understood and studied in the context of much simpler flat spacetime (described by the theory of special relativity); in this context the Hawking radiation takes the form of the so-called Unruh effect, a thermal effect in the vacuum of a Minkowski quantum field theory that can be measured by accelerated observers. LÄS MER
3. Intermediate-mass black hole binary as an origin of super-massive black holes
Kandidat-uppsats, Lunds universitet/Astrofysik; Lunds universitet/Fysiska institutionenSammanfattning : Galactic nuclei contain super-massive black holes (SMBHs), nuclear stellar clusters (NSCs), or both. In the NSC, intermediate-mass black holes (IMBHs) are likely to reside and form highly eccentric binaries. Over time, the orbit of a binary could harden via interaction with surrounding low-mass stars. LÄS MER
4. Ursäkta, var är klockan?
Magister-uppsats, Linnéuniversitetet/Institutionen för film och litteratur (IFL)Sammanfattning : Presentation och reflektion Mitt projekt som ni här ska få ta del av är inledningen av en roman som enklast kan beskrivas som en fantasydeckare med humoristiska inslag. Från att ha provat på att skriva på en ny genre (historisk deckare) under Kreativt skrivande III, som jag gick läsåret 2020/2021, bestämde jag mig för att prova på ytterligare en ny genre till den här kursen. LÄS MER
5. Hyper-velocity stars from globular clusters hosting intermediate-mass black holes
Kandidat-uppsats, Lunds universitet/Astrofysik; Lunds universitet/Fysiska institutionenSammanfattning : In 1988 Hills proposed that stars can gain velocities above 500 km s−1 if they are in a stellar binary which gets disrupted by a super massive black hole (SMBH). One of the stars would get trapped in an elliptical orbit around the SMBH while the other gets ejected and obtains a relatively high velocity. LÄS MER