Zobrazeno 1 - 10
of 513
pro vyhledávání: '"Vikman P"'
We numerically study axion-U(1) inflation, focusing on the regime where the coupling between axions and gauge fields results in significant backreaction from the amplified gauge fields during inflation. These amplified gauge fields not only generate
Externí odkaz:
http://arxiv.org/abs/2411.04854
We study domain walls (DWs) arising in field theories where $Z_2$-symmetry is spontaneously broken by a scalar expectation value decreasing proportionally to the Universe temperature. The energy density of such melting DWs redshifts sufficiently fast
Externí odkaz:
http://arxiv.org/abs/2410.21971
Publikováno v:
JCAP09(2024)047
Employing the publicly available CosmoLattice code, we conduct numerical simulations of a domain wall network and the resulting gravitational waves (GWs) in a radiation-dominated Universe in the $Z_2$-symmetric scalar field model. In particular, the
Externí odkaz:
http://arxiv.org/abs/2406.17053
Publikováno v:
BMC Geriatrics, Vol 24, Iss 1, Pp 1-11 (2024)
Abstract Background Postural control is dependent on the central nervous system’s accurate interpretation of sensory information to formulate and execute adequate motor actions. Research has shown that cognitive functions are associated with both p
Externí odkaz:
https://doaj.org/article/91c60dcb40c2453cb9e0afedbc8218c8
Publikováno v:
Phys. Rev. D 108, 123529 (2023)
We discuss cosmic domain walls described by a tension red-shifting with the expansion of the Universe. These melting domain walls emit gravitational waves with the low-frequency spectral shape $\Omega_{gw}\propto f^{2}$ corresponding to the spectral
Externí odkaz:
http://arxiv.org/abs/2307.04582
Negative kinetic energies correspond to ghost degrees of freedom, which are potentially of relevance for cosmology, quantum gravity, and high energy physics. We present a novel wide class of stable mechanical systems where a positive energy degree of
Externí odkaz:
http://arxiv.org/abs/2305.09631
We propose a new non-trivial way to combine mimetic dark matter with the mimetic formulation of unimodular gravity. This yields a Weyl-invariant higher-derivative scalar-vector-tensor theory. We demonstrate that on-shell its behavior mimics GR with a
Externí odkaz:
http://arxiv.org/abs/2212.14867
Publikováno v:
JHEP 07 (2023) 154
We show that invertible transformations of dynamical variables can change the number of dynamical degrees of freedom. Moreover, even in cases when the number of dynamical degrees of freedom remains unchanged, the resulting dynamics can be essentially
Externí odkaz:
http://arxiv.org/abs/2208.05951
Publikováno v:
JCAP 11 (2022) 019
We analyse the dynamical properties of disformally transformed theories of gravity. We show that disformal transformation typically introduces novel degrees of freedom, equivalent to the mimetic dark matter, which possesses a Weyl-invariant formulati
Externí odkaz:
http://arxiv.org/abs/2207.12611
Publikováno v:
Frontiers in Sports and Active Living, Vol 6 (2024)
In Swedish school health services, local initiatives have been taken to use physical activity on prescription (PAP) to encourage physically inactive children to become more active. Previous research shows that interprofessional collaboration plays a
Externí odkaz:
https://doaj.org/article/4c0dbbc24f324de7908dc8aa3794943e