Zobrazeno 1 - 10
of 257
pro vyhledávání: '"Creminelli, P."'
Autor:
Creminelli, Paolo, Vernizzi, Filippo
Primordial gravitational waves, after they enter the horizon and decay away, leave a residual displacement in test particles: a memory, in analogy with gravitational waves generated by astrophysical sources. The displacement in the distance between t
Externí odkaz:
http://arxiv.org/abs/2407.08472
We study the constraints imposed on the electromagnetic response of general media by microcausality (commutators of local fields vanish outside the light cone) and positivity of the imaginary parts (the medium can only absorb energy from the external
Externí odkaz:
http://arxiv.org/abs/2405.09614
We study the statistics of scalar perturbations in models of inflation with small and rapid oscillations in the inflaton potential (resonant non-Gaussianity). We do so by deriving the wavefunction $\Psi[\zeta(\boldsymbol{x})]$ non-perturbatively in $
Externí odkaz:
http://arxiv.org/abs/2401.10212
We study the $S$-matrix of Goldstones in the renormalizable theory of a $U(1)$ complex scalar at finite charge, i.e. in a state that breaks Lorentz invariance. The theory is weakly coupled so that this $S$-matrix exists at all energies. Unlike the Lo
Externí odkaz:
http://arxiv.org/abs/2312.08441
Publikováno v:
Journal of High Energy Physics, Vol 2024, Iss 8, Pp 1-54 (2024)
Abstract We study the constraints imposed on the electromagnetic response of general media by microcausality (commutators of local fields vanish outside the light cone) and positivity of the imaginary parts (the medium can only absorb energy from the
Externí odkaz:
https://doaj.org/article/532520553e5f48e99ca5dc92781a67ee
We describe a new mechanism that gives rise to dissipation during cosmic inflation. In the simplest implementation, the mechanism requires the presence of a massive scalar field with a softly-broken global $U(1)$ symmetry, along with the inflaton fie
Externí odkaz:
http://arxiv.org/abs/2305.07695
Publikováno v:
Journal of High Energy Physics, Vol 2024, Iss 6, Pp 1-28 (2024)
Abstract We study the S-matrix of Goldstones in the renormalizable theory of a U(1) complex scalar at finite charge, i.e. in a state that breaks Lorentz invariance. The theory is weakly coupled so that this S-matrix exists at all energies. Unlike the
Externí odkaz:
https://doaj.org/article/60ee19688d264ec6ae8273d3078ee852
We derive positivity bounds on EFT coefficients in theories where boosts are spontaneously broken. We employ the analytic properties of the retarded Green's function of conserved currents (or of the stress-energy tensor) and assume the theory becomes
Externí odkaz:
http://arxiv.org/abs/2207.14224
Publikováno v:
Journal of High Energy Physics, Vol 2024, Iss 3, Pp 1-54 (2024)
Abstract We study the statistics of scalar perturbations in models of inflation with small and rapid oscillations in the inflaton potential (resonant non-Gaussianity). We do so by deriving the wavefunction Ψ[ζ(x)] non-perturbatively in ζ, but at f
Externí odkaz:
https://doaj.org/article/bdc3077ba07748cfa5ea8df64e235d48
Inflationary perturbations are approximately Gaussian and deviations from Gaussianity are usually calculated using in-in perturbation theory. This method, however, fails for unlikely events on the tail of the probability distribution: in this regime
Externí odkaz:
http://arxiv.org/abs/2103.09244