PBH-infused seesaw origin of matter and unique gravitational waves

Borah, Debasish; Jyoti, Das, Suruj; Samanta, Rome; Urban, Federico

doi:10.1007/jhep03(2023)127

Cited by 15 publications

(2 citation statements)

References 179 publications

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“…surement of the GW spectrum from high to lower frequencies would allow to determine the universe expansion rate from early to later times [16,[121][122][123][124][125][126][127][128]. Instead, the use of short-lived GW sources like the ones from first-order phase transitions can only probe the cosmic history within a small window of time around when the source is active [22,[129][130][131][132].…”

Section: Jhep08(2023)196mentioning

confidence: 99%

Primordial black hole archaeology with gravitational waves from cosmic strings

Ghoshal,

Gouttenoire,

Heurtier

et al. 2023

J. High Energ. Phys.

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Light primordial black holes (PBHs) with masses smaller than 109 g (10−24M⊙) evaporate before the onset of Big-Bang nucleosynthesis, rendering their detection rather challenging. If efficiently produced, they may have dominated the universe energy density. We study how such an early matter-dominated era can be probed successfully using gravitational waves (GW) emitted by local and global cosmic strings. While previous studies showed that a matter era generates a single-step suppression of the GW spectrum, we instead find a double-step suppression for local-string GW whose spectral shape provides information on the duration of the matter era. The presence of the two steps in the GW spectrum originates from GW being produced through two events separated in time: loop formation and loop decay, taking place either before or after the matter era. The second step — called the knee — is a novel feature which is universal to any early matter-dominated era and is not only specific to PBHs. Detecting GWs from cosmic strings with LISA, ET, or BBO would set constraints on PBHs with masses between 106 and 109 g for local strings with tension Gμ = 10−11, and PBHs masses between 104 and 109 g for global strings with symmetry-breaking scale η = 1015 GeV. Effects from the spin of PBHs are discussed.

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Section: Jhep08(2023)196mentioning

confidence: 99%

Primordial black hole archaeology with gravitational waves from cosmic strings

Ghoshal,

Gouttenoire,

Heurtier

et al. 2023

J. High Energ. Phys.

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“…Let's recall that 12.5 yr data from NANOGrav[31] could be explained with stable cosmic string as the source of GW[32][33][34][35]. However, the 2023 data can not be fitted well with stable CS as the preferred slope pertinent to the new data[5] is inconsistent with the required amplitude.…”

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confidence: 99%

Imprint of inflationary gravitational waves and WIMP dark matter in pulsar timing array data

Borah,

Das,

Samanta

2024

J. Cosmol. Astropart. Phys.

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Motivated by the recent release of new results from five different pulsar timing array (PTA) experiments claiming to have found compelling evidence for primordial gravitational waves (GW) at nano-Hz frequencies, we consider the prospects of generating such a signal from inflationary blue-tilted tensor power spectrum in a specific dark matter (DM) scenario dubbed as Miracle-less WIMP. While Miracle-less WIMP, due to insufficient interaction rate with the Standard Model (SM) bath gets thermally overproduced, inflationary blue-tilted gravitational waves (BGW) in compliance with PTA data, conflict cosmological observations if reheat temperature after inflation is sufficiently high. Both these issues are circumvented with late entropy dilution, bringing DM abundance within observational limits and creating a doubly-peaked feature in the BGW spectrum consistent with cosmological observations. The blue-tilted tail of the low-frequency peak can fit NANOGrav 15 yr data, while other parts of the spectrum are within reach of present and future GW experiments.

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Superradiant leptogenesis

Ghoshal,

Perez-Gonzalez,

Turner

2024

J. High Energ. Phys.

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We investigate how superradiance affects the generation of baryon asymmetry in a universe with rotating primordial black holes, considering a scenario where a scalar boson is coupled to the heavy right-handed neutrinos. We identify the regions of the parameter space where the scalar production is enhanced due to superradiance. This enhancement, coupled with the subsequent decay of the scalar into right handed neutrinos, results in the non-thermal creation of lepton asymmetry. We show that successful leptogenesis is achieved for masses of primordial black holes in the range of order O(0.1 g) − O(10 g) and the lightest of the heavy neutrino masses, MN ~ O(1012) GeV. Consequently, regions of the parameter space, which in the case of Schwarzchild PBHs were incompatible with viable leptogenesis, can produce the observed matter-antimatter asymmetry.

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PBH-infused seesaw origin of matter and unique gravitational waves

Cited by 15 publications

References 179 publications

Primordial black hole archaeology with gravitational waves from cosmic strings

Primordial black hole archaeology with gravitational waves from cosmic strings

Imprint of inflationary gravitational waves and WIMP dark matter in pulsar timing array data

Superradiant leptogenesis

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