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pro vyhledávání: '"Ramberg, Nicklas"'
Autor:
Madge, Eric, Morgante, Enrico, Puchades-Ibáñez, Cristina, Ramberg, Nicklas, Ratzinger, Wolfram, Schenk, Sebastian, Schwaller, Pedro
Publikováno v:
JHEP 2023 no.10, 171 (2023)
In recent years, several pulsar timing array collaborations have reported first hints for a stochastic gravitational wave background at nano-Hertz frequencies. Here we elaborate on the possibility that this signal comes from new physics that leads to
Externí odkaz:
http://arxiv.org/abs/2306.14856
Publikováno v:
Phys.Rev.D 107 (2023) 3, 036010
We analyze the phase transition in improved holographic QCD to obtain an estimate of the gravitational wave signal emitted in the confinement transition of a pure SU(3) Yang-Mills dark sector. We derive the effective action from holography and show t
Externí odkaz:
http://arxiv.org/abs/2210.11821
Publikováno v:
JCAP02(2023)039
We present a new probe of purely gravitationally coupled sectors with large anisotropies. These anisotropies are damped via gravitational interactions with the baryon-photon fluid, which is heated up in the process. The injected heat causes measurabl
Externí odkaz:
http://arxiv.org/abs/2209.14313
Publikováno v:
Universe 8(12), 634 (2022)
The axion field, the angular direction of the complex scalar field associated with the spontaneous symmetry breaking of the Peccei-Quinn (PQ) symmetry, could have originated with initial non-zero velocity. The presence of a non-zero angular velocity
Externí odkaz:
http://arxiv.org/abs/2111.03677
Autor:
Ramberg, Nicklas
This thesis uses theoretical studies, and numerical simulations to provide results of the experimental reach to detect the QCD axion as dark matter in a Non-standard cosmological background. Assuming that the QCD axion constitutes the full CDM abunda
Externí odkaz:
http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-394014
Autor:
Ramberg, Nicklas, Visinelli, Luca
Publikováno v:
Phys. Rev. D 103, 063031 (2021)
The North American Nanohertz Observatory for Gravitational Waves (NANOGrav) collaboration has recently reported strong evidence for a stochastic process affecting the 12.5 yr dataset of pulsar timing residuals. We show that the signal can be interpre
Externí odkaz:
http://arxiv.org/abs/2012.06882
Autor:
Ramberg, Nicklas, Visinelli, Luca
Publikováno v:
Phys. Rev. D 99, 123513 (2019)
We show results for the expected reach of the network of experiments that is being set up globally with the aim of detecting the "invisible" axion, in light of a non-standard thermal history of the universe. Assuming that the axion is the dark matter
Externí odkaz:
http://arxiv.org/abs/1904.05707
Autor:
Ramberg, Nicklas, Sjöqvist, Erik
Publikováno v:
Phys. Rev. Lett. 122, 140501 (2019)
Holonomic quantum computation uses non-Abelian geometric phases to realize error resilient quantum gates. Nonadiabatic holonomic gates are particularly suitable to avoid unwanted decoherence effects, as they can be performed at high speed. By letting
Externí odkaz:
http://arxiv.org/abs/1812.02927
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Akademický článek
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