Zobrazeno 1 - 10
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pro vyhledávání: '"KAISER, DAVID"'
Autor:
Gregory, Sean M. D., Schiattarella, Silvia, Barroso, Vitor S., Kaiser, David I., Avgoustidis, Anastasios, Weinfurtner, Silke
Far-from-equilibrium phenomena unveil the intricate principles of complex systems, including snowflake growth and fluid turbulence, with broad applications ranging from foreign exchange trading to climate modeling. A recurring feature across these sy
Externí odkaz:
http://arxiv.org/abs/2410.08842
Publikováno v:
Physical Review D 110 (2024), L061302
We demonstrate that "natural inflation", also known as "axion inflation", can be compatible with Planck 2018 measurements of the cosmic microwave background, while predicting an exponentially small tensor-to-scalar ratio, e.g., $r\sim 10^{-15}$. The
Externí odkaz:
http://arxiv.org/abs/2405.13881
Primordial black holes (PBHs) are hypothetical objects that could have originated from density fluctuations in a very early phase of our Universe. Recent observations restrict the masses that such PBHs could have, if they are to constitute all of dar
Externí odkaz:
http://arxiv.org/abs/2405.08113
Autor:
Steingasser, Thomas, Kaiser, David I.
We revisit the path integral description of quantum tunneling and show how it can be generalized to excited states. For clarity, we focus on the simple toy model of a point particle in a double-well potential, for which we perform all steps explicitl
Externí odkaz:
http://arxiv.org/abs/2402.00099
Publikováno v:
Physical Review D 110 (2024), 063533
Primordial black holes (PBHs) remain a viable dark matter candidate in the asteroid-mass range. We point out that in this scenario, the PBH abundance would be large enough for at least one object to cross through the inner Solar System per decade. Si
Externí odkaz:
http://arxiv.org/abs/2312.17217
We derive the finite-temperature quantum-tunneling rate from first principles. The rate depends on both real- and imaginary-time; we demonstrate that the relevant instantons should therefore be defined on a Schwinger-Keldysh contour, and how the fami
Externí odkaz:
http://arxiv.org/abs/2310.19865
Publikováno v:
Physical Review Letters vol. 132, 231402 (2024)
We describe a realistic mechanism whereby black holes with significant QCD color charge could have formed during the early universe. Primordial black holes (PBHs) could make up a significant fraction of the dark matter if they formed well before the
Externí odkaz:
http://arxiv.org/abs/2310.16877
Publikováno v:
Physical Review D 108 (2023), 125010
Decades of analytic and computational work have demonstrated that a charge immersed in a hot plasma is screened. For both Abelian and non-Abelian interactions, the characteristic screening length $1/m_D$ is set by the so-called Debye mass $m_D \sim g
Externí odkaz:
http://arxiv.org/abs/2309.15385