Detecting dark blobs

Grabowska, Dorota; Melia, Tom; Rajendran, Surjeet

doi:10.1103/physrevd.98.115020

Cited by 71 publications

(68 citation statements)

References 49 publications

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“…If the scale of the detector is L and it operates for a time ∆t, then the expected number of dQN to pass through the detector is estimated as TeV T γ,c the flux of dQNs through a terrestrial detector can be large, which opens up the possibility of discovering dQN dark matter with future observations (see also Ref. [39]). Of course, the detection of dQNs requires a direct coupling between the dark and visible sectors, which introduces additional model dependence.…”

Section: Directly Detecting Dark Quark Nuggets At Earthmentioning

confidence: 99%

Dark quark nuggets

2019

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Dark quark nuggets", a lump of dark quark matter, can be produced in the early universe for a wide range of confining gauge theories and serve as a macroscopic dark matter candidate. The two necessary conditions, a nonzero dark baryon number asymmetry and a first-order phase transition, can be easily satisfied for many asymmetric dark matter models and QCD-like gauge theories with a few massless flavors. For confinement scales from 10 keV to 100 TeV, these dark quark nuggets with a huge dark baryon number have their masses vary from 10 23 g to 10 −7 g and their radii from 10 8 cm to 10 −15 cm. Such macroscopic dark matter candidates can be searched for by a broad scope of experiments and even new detection strategies. Specifically, we have found that the gravitational microlensing experiments can probe heavier dark quark nuggets or smaller confinement scales around 10 keV; collision of dark quark nuggets can generate detectable and transient electromagnetic radiation signals; the stochastic gravitational wave signals from the first order phase transition can be probed by the pulsar timing array observations and other space-based interferometry experiments; the approximately massless dark mesons can behave as dark radiation to be tested by the next-generation CMB experiments; the free dark baryons, as a subcomponent of dark matter, can have direct detection signals for a sufficiently strong interaction strength with the visible sector.

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Section: Directly Detecting Dark Quark Nuggets At Earthmentioning

confidence: 99%

Dark quark nuggets

2019

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“…color-charged dark matter [78][79][80], near-Planck mass dark matter [81], monopole dark matter (e.g. [82]), and dark matter composed of many constituent states, also known as composite dark matter [83][84][85][86][87][88][89].…”

Section: Strongly Interacting and Composite Dark Mattermentioning

confidence: 99%

Galactic Center gas clouds and novel bounds on ultralight dark photon, vector portal, strongly interacting, composite, and super-heavy dark matter

et al. 2019

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Cold gas clouds recently discovered hundreds of parsecs from the center of the Milky Way Galaxy have the potential to detect dark matter. With a detailed treatment of gas cloud microphysical interactions, we determine Galactic Center gas cloud temperatures, unbound electron abundances, atomic ionization fractions, heating rates, cooling rates, and find how these quantities vary with metallicity. Considering a number of different dark sector heating mechanisms, we set new bounds on ultra-light dark photon dark matter for masses 10 −22 − 10 −10 eV, vector portal dark matter coupled through a sub-MeV mass boson, and up to 10 60 GeV mass dark matter that interacts with baryons.

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“…Cumulant expansion methods similar to those explored in Refs. [18,50,[103][104][105][106][107] can be used to estimate Φ Θ (1) with systematic uncertainties whose size can be assessed by varying the truncation order of the expansion. For a generic complex random variable z with characteristic function Φ z (k) = e ikz , cumulants can be defined as the coefficients of a Taylor series for ln(Φ z ),…”

Section: E Unwrapped Characteristic Function and Cumulant Expansionmentioning

confidence: 99%

Phase unwrapping and one-dimensional sign problems

2018

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Sign problems in path integrals arise when different field configurations contribute with different signs or phases. Phase unwrapping describes a family of signal processing techniques in which phase differences between elements of a time series are integrated to construct noncompact unwrapped phase differences. By combining phase unwrapping with a cumulant expansion, path integrals with sign problems arising from phase fluctuations can be systematically approximated as linear combinations of path integrals without sign problems. This work explores phase unwrapping in zero-plus-one-dimensional complex scalar field theory. Results with improved signal-to-noise ratios for the spectrum of scalar field theory can be obtained from unwrapped phases, but the size of cumulant expansion truncation errors is found to be undesirably sensitive to the parameters of the phase unwrapping algorithm employed. It is argued that this numerical sensitivity arises from discretization artifacts that become large when phases fluctuate close to singularities of a complex logarithm in the definition of the unwrapped phase.1 Other interesting LQCD observables face distinct StN problems. For instance, isoscalar meson correlation functions are uncharged under U (1) symmetries and possess exponential StN problems but not U (1) phase fluctuations. Excited-state energies are extracted from differences of correlation functions with the same quantum numbers and face StN problems arising from the exponentially precise cancellations needed to project out ground-state contributions and leave exponentially faster decaying excited-state contributions. In large nuclei, StN problems associated with MeV excitation energies are negligible compared to the phase fluctuation StN problem associated with the multi-GeV rest mass of the nucleus. LQCD calculations of isoscalar mesons and exotic hadrons conversely face StN problems primarily from sources besides U (1) phase fluctuations, and phase unwrapping is not immediately applicable to these systems. 2 Cumulant expansions of noncompact "extensive phases" have also been applied to sign problems in QCD and other theories at nonzero chemical potential [51][52][53][54][55][56].

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Detecting dark blobs

Cited by 71 publications

References 49 publications

Dark quark nuggets

Dark quark nuggets

Galactic Center gas clouds and novel bounds on ultralight dark photon, vector portal, strongly interacting, composite, and super-heavy dark matter

Phase unwrapping and one-dimensional sign problems

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