Zobrazeno 1 - 10
of 66
pro vyhledávání: '"Alberto Salvio"'
Autor:
Alberto Salvio
Publikováno v:
Physics Letters B, Vol 856, Iss , Pp 138920- (2024)
Unimodular gravity addresses the old cosmological constant (CC) problem, explaining why such constant is not at least as large as the largest particle mass scale, but classically it is indistinguishable from ordinary gravity. Conversely, quantum phys
Externí odkaz:
https://doaj.org/article/b943dbf9703e4d6bb5b0390347c6eab1
Autor:
Alberto Salvio
Publikováno v:
Physics Letters B, Vol 852, Iss , Pp 138639- (2024)
An explicit realistic model featuring a supercooled phase transition, which allows us to explain the background of gravitational waves recently detected by pulsar timing arrays, is constructed. In this model the phase transition corresponds to radiat
Externí odkaz:
https://doaj.org/article/80c17f5d57aa40878d0a0e62efc36d0d
Autor:
Gianfranco Pradisi, Alberto Salvio
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 82, Iss 9, Pp 1-19 (2022)
Abstract In a geometrical approach to gravity the metric and the (gravitational) connection can be independent and one deals with metric-affine theories. We construct the most general action of metric-affine effective field theories, including a gene
Externí odkaz:
https://doaj.org/article/7b5f847b4e2046bfaa2dac639866b2c1
Autor:
Anish Ghoshal, Alberto Salvio
Publikováno v:
Journal of High Energy Physics, Vol 2020, Iss 12, Pp 1-27 (2020)
Abstract A totally asymptotically free QCD axion model, where all couplings flow to zero in the infinite energy limit, was recently formulated. A very interesting feature of this fundamental theory is the ability to predict some low-energy observable
Externí odkaz:
https://doaj.org/article/8f0b051594b941479f193eccebc3d14a
Autor:
Alberto Salvio
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 79, Iss 9, Pp 1-16 (2019)
Abstract Extensions of the Standard Model and general relativity featuring a UV fixed point can leave observable implications at accessible energies. Although mass parameters such as the Planck scale can appear through dimensional transmutation, all
Externí odkaz:
https://doaj.org/article/29869fce57044063931d362c36d24627
Autor:
Alberto Salvio
Publikováno v:
Physics Letters B, Vol 808, Iss , Pp 135686- (2020)
We construct and study a fundamental field theory of the QCD axion: all couplings flow to zero in the infinite-energy limit realizing the totally asymptotically free (TAF) scenario. Some observable quantities (such as the masses of new quarks and sca
Externí odkaz:
https://doaj.org/article/d41eb0cd8d0840bc8d476bfd223d8dbd
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 78, Iss 10, Pp 1-12 (2018)
Abstract 4-Derivative gravity provides a renormalizable theory of quantum gravity at the price of introducing a physical ghost, which could admit a sensible positive-energy quantization. To understand its physics, we compute ghost-mediated scattering
Externí odkaz:
https://doaj.org/article/1ba9551c59a9467995098dbe8e22c1a3
Autor:
Alberto Salvio
Publikováno v:
Physics Letters B, Vol 780, Iss , Pp 111-117 (2018)
It has been pointed out that a large non-minimal coupling ξ between the Higgs and the Ricci scalar can source higher derivative operators, which may change the predictions of Higgs inflation. A variant, called critical Higgs inflation, employs the n
Externí odkaz:
https://doaj.org/article/c12f2efaaef14b0597b61cede77fc51d
Autor:
Alberto Salvio, Alessandro Strumia
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 78, Iss 2, Pp 1-15 (2018)
Abstract The self-interactions of the conformal mode of the graviton are controlled, in dimensionless gravity theories (agravity), by a coupling $$f_0$$ f0 that is not asymptotically free. We show that, nevertheless, agravity can be a complete theory
Externí odkaz:
https://doaj.org/article/3b08ccbe33c14abfa7f6a225e678b365
Autor:
Alberto Salvio, Simone Scollo
Publikováno v:
Universe, Vol 7, Iss 10, p 354 (2021)
Extending the standard model with three right-handed neutrinos and a simple QCD axion sector can account for neutrino oscillations, dark matter and baryon asymmetry; at the same time, it solves the strong CP problem, stabilizes the electroweak vacuum
Externí odkaz:
https://doaj.org/article/c8dbe8f95ce5439fb31d5a91bf2a7917