Astrophysical constraints on massive unstable neutral relic particles

Ellis, Jonathan Richard; Gelmini, Graciela B.; López, Jorge L.; Nanopoulos, Dimitri V.; Sarkar, S.

doi:10.1016/0550-3213(92)90438-h

Cited by 385 publications

(514 citation statements)

References 68 publications

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“…In such scenarios, there may be several cosmological problems caused by gravitino decay products which can dissociate nuclei during BBN, destroying its successful predictions [567,574,566,568,570,572,569,575,576]. In general, successful BBN requires the photons to have a nearly thermal spectrum, while the gravitino decay products may induce sufficient departures from the thermal spectrum to ruin the successful ratios of element abundances.…”

Section: Gravitinosmentioning

confidence: 99%

The soft supersymmetry-breaking Lagrangian: theory and applications

Chung

Everett

Kane³

et al. 2005

Physics Reports

415

339

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After an introduction recalling the theoretical motivation for low energy (100 GeV to TeV scale) supersymmetry, this review describes the theory and experimental implications of the soft supersymmetry-breaking Lagrangian of the general minimal supersymmetric standard model (MSSM). Extensions to include neutrino masses and nonminimal theories are also discussed. Topics covered include models of supersymmetry breaking, phenomenological constraints from electroweak symmetry breaking, flavor/CP violation, collider searches, and cosmological constraints including dark matter and implications for baryogenesis and inflation.

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Section: Gravitinosmentioning

confidence: 99%

The soft supersymmetry-breaking Lagrangian: theory and applications

Chung

Everett

Kane³

et al. 2005

Physics Reports

415

339

View full text Add to dashboard Cite

show abstract

“…A widely considered process is the decay or annihilation of massive particles [20,32,33,34,35,36,37,38]. The decay channel depends on the nature of the particles, and could, for example, include charged and neutral leptons, quarks or gauge bosons.…”

Section: A Modified Ionization Historymentioning

confidence: 99%

Cosmological constraints in the presence of ionizing and resonance radiation at recombination

Bean

Melchiorri²,

Silk

2007

Phys. Rev. D

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With the recent measurement of full sky cosmic microwave background polarization from WMAP, key cosmological degeneracies have been broken, allowing tighter constraints to be placed on cosmological parameters inferred assuming a standard recombination scenario. Here we consider the effect on cosmological constraints if additional ionizing and resonance radiation sources are present at recombination. We find that the new CMB data significantly improve the constraints on the additional radiation sources, with log 10 [ǫα] < −0.5 and log 10 [ǫi] < −2.4 at 95% c.l. for resonance and ionizing sources respectively. Including the generalized recombination scenario, however, we find that the constraints on the scalar spectral index ns are weakened to ns = 0.98 ± 0.03, with the ns = 1 case now well inside the 95% c.l.. The relaxation of constraints on tensor modes, scale invariance, dark energy and neutrino masses are also discussed.

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“…One of the standard distortions, known as the Compton y-distortion, is created in the regime of inefficient energy transfer between electrons and photons, relevant at redshift z 5 × 10 4 . Processes creating this type of distortion include the inverse-Compton scattering of CMB photons off hot electrons during the epoch of reionization and structure formation Hu et al 1994b;Refregier & et al 2000;Hill et al 2015), also known in connection with the thermal Sunyaev-Zeldovich (tSZ) effect (Zeldovich & Sunyaev 1969), but can also be related to non-standard physics, e.g., the presence of long-lived decaying particles (Sarkar & Cooper 1984;Ellis et al 1992;Hu & Silk 1993b;Chluba 2013a).…”

Section: Introductionmentioning

confidence: 99%

Prospects for measuring cosmic microwave background spectral distortions in the presence of foregrounds

Abitbol

Chluba

Hill

et al. 2017

Monthly Notices of the Royal Astronomical Society

146

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Measurements of cosmic microwave background spectral distortions have profound implications for our understanding of physical processes taking place over a vast window in cosmological history. Foreground contamination is unavoidable in such measurements and detailed signal-foreground separation will be necessary to extract cosmological science. In this paper, we present MCMC-based spectral distortion detection forecasts in the presence of Galactic and extragalactic foregrounds for a range of possible experimental configurations, focusing on the Primordial Inflation Explorer (PIXIE) as a fiducial concept. We consider modifications to the baseline PIXIE mission (operating 12 months in distortion mode), searching for optimal configurations using a Fisher approach. Using only spectral information, we forecast an extended PIXIE mission to detect the expected average non-relativistic and relativistic thermal Sunyaev-Zeldovich distortions at high significance (194σ and 11σ, respectively), even in the presence of foregrounds. The ΛCDM Silk damping µ-type distortion is not detected without additional modifications of the instrument or external data. Galactic synchrotron radiation is the most problematic source of contamination in this respect, an issue that could be mitigated by combining PIXIE data with future ground-based observations at low frequencies (ν 15 − 30 GHz). Assuming moderate external information on the synchrotron spectrum, we project an upper limit of |µ| < 3.6 × 10 −7 (95% c.l.), slightly more than one order of magnitude above the fiducial ΛCDM signal from the damping of small-scale primordial fluctuations, but a factor of 250 improvement over the current upper limit from COBE/FIRAS. This limit could be further reduced to |µ| < 9.4 × 10 −8 (95% c.l.) with more optimistic assumptions about extra low-frequency information and would rule out many alternative inflation models as well as provide new constraints on decaying particle scenarios.

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Astrophysical constraints on massive unstable neutral relic particles

Cited by 385 publications

References 68 publications

The soft supersymmetry-breaking Lagrangian: theory and applications

The soft supersymmetry-breaking Lagrangian: theory and applications

Cosmological constraints in the presence of ionizing and resonance radiation at recombination

Prospects for measuring cosmic microwave background spectral distortions in the presence of foregrounds

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