Probing Leptogenesis and Pre-BBN Universe with Gravitational Waves Spectral Shapes

Samanta, Rome; Datta, Satyabrata

doi:10.48550/arxiv.2108.08359

Cited by 2 publications

(4 citation statements)

References 78 publications

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“…As possible extensions of this work, we briefly discussed a simple embedding into a U (1) B−L model with three right-handed neutrinos, detail its prospects for also including a realistic explanation for the neutrino masses and baryogenesis, and outline some constraints that can be obtained from ultra-high-energy cosmic rays. parameter ω, the scaling number density n ω (t, l k ) can be computed as [87,121]…”

Section: Discussionmentioning

confidence: 99%

“…This scenario is relevant in our case, since the PBHs introduce an early matter domination era before BBN. For the k = 1 mode, the f * can be calculated in a simple analytical way that gives [69,121]…”

Section: Gravitational Waves From Cosmic Strings and Their Spectral F...mentioning

confidence: 99%

“…The recent articles [74,[119][120][121] consider the SM U(1) B−L model where all the three RH neutrinos decay quickly and show how the GWs from cosmic strings from the U (1) symmetry breaking can be a probe of leptogenesis. However, this RH neutrino extension can be made more interesting by taking one of them to be rigorously stable due to an extra parity symmetry or stable on cosmological scale because of its very feeble interactions with the SM: such RH neutrino then qualifies as a DM candidate.…”

Section: Baryogenesismentioning

confidence: 99%

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Testing Super-Heavy Dark Matter from Primordial Black Holes with Gravitational Waves

Samanta,

Urban

2021

Preprint

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Ultra-light primordial black holes with masses M BH < 10 9 g evaporate before big-bang nucleosynthesis producing all matter fields, including dark matter, in particular super-heavy dark matter: M DM 10 10 GeV. If the dark matter gets its mass via U (1) symmetry-breaking, the phase transition that gives a mass to the dark matter also produces cosmic strings which radiate gravitational waves. Because the symmetry-breaking scale Λ CS is of the same order as M DM , the gravitational waves radiated by the cosmic strings have a large enough amplitude to be detectable across all frequencies accessible with current and planned experimental facilities. Moreover, an epoch of early primordial black hole domination introduces a unique spectral break in the gravitational wave spectrum whose frequency is related to the super-heavy dark matter mass. Hence, the features of a stochastic background of primordial gravitational waves could shed light on the primordial black hole origin of super-heavy dark matter. In this perspective, the recent finding of a stochastic common-spectrum process across many pulsars by two nano-frequency pulsar timing arrays would fix the dark matter mass to be 3 × 10 13 GeV M DM 10 14 GeV. The (non-)detection of a spectral break at 0.2 Hz f * 0.4 Hz would (exclude) substantiate this interpretation of the signal.

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Section: Discussionmentioning

confidence: 99%

Section: Gravitational Waves From Cosmic Strings and Their Spectral F...mentioning

confidence: 99%

Section: Baryogenesismentioning

confidence: 99%

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Testing Super-Heavy Dark Matter from Primordial Black Holes with Gravitational Waves

Samanta,

Urban

2021

Preprint

Self Cite

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“…Similarly, loops produced during the matter era result in a steeply falling contribution to the GW spectrum when going from higher to lower frequencies [15]. In this sense, cosmic strings can be used to probe nonstandard expansion histories of the early Universe, such as early matter domination [18,19] and kination [20,21], see also Ref. [22].…”

Section: Introductionmentioning

confidence: 99%

Gravitational Waves from Current-Carrying Cosmic Strings

Auclair,

Blasi,

Brdar

et al. 2022

Preprint

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Cosmic strings are predicted by many Standard Model extensions involving the cosmological breaking of a symmetry with nontrivial first homotopy group and represent a potential source of primordial gravitational waves (GWs). Present efforts to model the GW signal from cosmic strings are often based on minimal models, such as, e.g., the Nambu-Goto action that describes cosmic strings as exactly one-dimensional objects without any internal structure. In order to arrive at more realistic predictions, it is therefore necessary to consider nonminimal models that make an attempt at accounting for the microscopic properties of cosmic strings. With this goal in mind, we derive in this paper the GW spectrum emitted by current-carrying cosmic strings (CCCSs), which may form in a variety of cosmological scenarios. Our analysis is based on a generalized version of the velocity-dependent one-scale (VOS) model, which, in addition to the mean velocity and correlation length of the string network, also describes the evolution of a chiral (light-like) current. As we are able to show, the solutions of the VOS equations imply a temporarily growing fractional cosmicstring energy density, Ωcs. This results in an enhanced GW signal across a broad frequency interval, whose boundaries are determined by the times of generation and decay of cosmic-string currents. Our findings have important implications for GW experiments in the Hz to MHz band and motivate the construction of realistic particle physics models that give rise to large currents on cosmic strings.

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Probing Leptogenesis and Pre-BBN Universe with Gravitational Waves Spectral Shapes

Cited by 2 publications

References 78 publications

Testing Super-Heavy Dark Matter from Primordial Black Holes with Gravitational Waves

Testing Super-Heavy Dark Matter from Primordial Black Holes with Gravitational Waves

Gravitational Waves from Current-Carrying Cosmic Strings

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