Parity violation in the Cosmic Microwave Background from a pseudoscalar inflaton
By L. Sorbo. 2011
320 citations recorded by the source corpus.
If the inflaton is a pseudoscalar, then it naturally interacts with gauge fields through the coupling ∝ Fμν μν. Through this coupling, the rolling inflaton produces quanta of the gauge field, that in their turn source the tensor components of the metric perturbations. Due to the parity-violating nature of the system, the right- and the left-handed tensor modes have different amplitudes. Such an asymmetry manifests itself in the form of non-vanishing TB and EB correlation functions in the Cosmic Microwave Background (CMB). We compute the amplitude of the parity-violating tensor modes and we discuss two scenarios, consistent with the current data, where parity-violating CMB correlation functions will be detectable in future experiments.
Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics
View Paper: https://www.semanticscholar.org/paper/5767f85e668a579b4f346ce6bd88f4f4a3853ce3
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Citations in the corpus
- Gravitational waves at interferometer scales and primordial black holes in axion inflation (2016, background): “The fact that only A+ modes are amplified (which is due to the breaking of parity associated to the pseudo-scalar inflaton) results in a much greater production of h+ with respect to h−, namely the sourced GW background breaks parity nearly maximally [37].”
- Phenomenology of a pseudo-scalar inflaton: naturally large nongaussianity (2011, background): “At large ξ, the integral over x can be performed as in the previous subsections, and one finds [36] fh,L ∼= 4.”
- Science with the space-based interferometer LISA. IV: probing inflation with gravitational waves (2016, background): “This is given by the sum of the individual powers in left- and right-handed gravitational waves, which are given by [86]”
- Scale-dependent gravitational waves from a rolling axion (2015, methodology): “This helicity mostly sources the GW of one definite chirality [31], through the two-body interaction δA + δA → δg.”
- Challenges and opportunities of gravitational-wave searches at MHz to GHz frequencies (2020, methodology): “The produced gauge quanta in turn generate inflaton perturbations and GW via 2→ 1 processes [77,78].”
- Particle production during inflation and gravitational waves detectable by ground-based interferometers (2011, background): “The production of tensor modes by a pseudoscalar inflaton through gauge field production was discussed in [20] and, in greater detail, in [22], where it was pointed out that these modes are chiral.”
- Adding helicity to inflationary magnetogenesis (2014, background): “J C A P 1 0 ( 2 0 1 4 ) 0 5 6 of the metric is completely negligible: this model violates the Lyth bound [35] in a way that is analogous to the one discussed first in [36] and subsequently in [30, 37, 38], since it displays a large tensor-to-scalar ratio without Planckian excursions of the inflaton.”
- Planck 2015 results. XVII. Constraints on primordial non-Gaussianity (2015, unknown): “This scenario has a rich and interesting phenomenology both for scalar and tensor primordial fluctuations (see, e.g., Barnaby & Peloso 2011; Sorbo 2011; Barnaby et al. 2011, 2012c; Linde et al. 2013; Meerburg & Pajer 2013; Ferreira & Sloth 2014).”
- Inflation and String Theory (2014, background): “An interesting property of the resulting tensor signal is that it is chiral [769], essentially because only one chirality of the gauge field is unstable.”