Zobrazeno 1 - 10
of 183
pro vyhledávání: '"Mcdonough, Evan"'
Cosmological models are often motivated and formulated in the language of particle physics, using quantities such as the axion decay constant, but tested against data using ostensibly physical quantities, such as energy density ratios, assuming unifo
Externí odkaz:
http://arxiv.org/abs/2409.09029
Publikováno v:
JHEP 2024, 71 (2024)
Dark photons are a theorized massive spin-1 particle which can be produced via various mechanisms, including cosmological gravitational particle production (GPP) in the early universe. In this work, we extend previous results for GPP of dark photons
Externí odkaz:
http://arxiv.org/abs/2405.19390
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
We study the interplay of the trans-Planckian censorship conjecture (TCC) and the swampland distance conjecture (SDC) in the context of multifield dark energy in a curved field space. In this scenario, the phase of accelerated expansion is realized a
Externí odkaz:
http://arxiv.org/abs/2405.05304
Axion and axion-like particles (ALPs) are a prominent candidate for physics beyond the Standard Model, and can play an important role in cosmology, serving as dark matter or dark energy, or both, drawing motivation in part from the string theory axiv
Externí odkaz:
http://arxiv.org/abs/2404.11642
Publikováno v:
Phys.Rev.Lett. 133 (2024) 6, 061602
We demonstrate that gravitational particle production (GPP) of a massive, Abelian, vector (Proca) field during inflation in the presence of nonminimal coupling to gravity may suffer from an instability which leads to runaway production of high-moment
Externí odkaz:
http://arxiv.org/abs/2403.15536
Publikováno v:
International Journal of Modern Physics D 0 (2024) 2430003
We review and update constraints on the Early Dark Energy (EDE) model from cosmological data sets, in particular Planck PR3 and PR4 cosmic microwave background (CMB) data and large-scale structure (LSS) data sets including galaxy clustering and weak
Externí odkaz:
http://arxiv.org/abs/2310.19899
The Kalb-Ramond field is an antisymmetric, rank-two tensor field which most notably appears in the context of string theory, but has largely been unexplored in the context of cosmology. In this work, motivated by the Kalb-Ramond field in string theor
Externí odkaz:
http://arxiv.org/abs/2309.02485
Axions and axion-like particles (ALPs) are a prominent dark matter candidate, drawing motivation in part from the axiverse of string theory. Axion-like particles can also arise as composite degrees of freedom of a dark sector, for example, as dark pi
Externí odkaz:
http://arxiv.org/abs/2304.11176
Autor:
Cicoli, Michele, Licheri, Matteo, Mahanta, Ratul, McDonough, Evan, Pedro, Francisco G., Scalisi, Marco
Early Dark Energy (EDE) is a promising model to resolve the Hubble Tension, that, informed by Cosmic Microwave Background data, features a generalization of the potential energy usually associated with axion-like particles. We develop realizations of
Externí odkaz:
http://arxiv.org/abs/2303.03414