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X-WR-CALDESC:Events for INPA
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DTSTART;TZID=America/Los_Angeles:20241204T110000
DTEND;TZID=America/Los_Angeles:20241204T120000
DTSTAMP:20260425T163501
CREATED:20241202T190134Z
LAST-MODIFIED:20241202T190143Z
UID:1878-1733310000-1733313600@inpa.lbl.gov
SUMMARY:Special INPA Speaker:  Sindhu Satyavolu  (IFAE) Institut de Fisica d'Altes Energies
DESCRIPTION:Date: December 4\, 2024 \nTime: 11:00 am – 12:00 pm \nLocation: Sessler Conference Room – 50A-5132 [Hybrid and In-Person] \nSpeaker: Sindhu Satyavolu (IFAE) Institut de Fisica d’Altes Energies \nTitle: Quasar proximity zones in a partially ionized IGM \nAbstract: Proximity zones of quasars with redshifts z > 5.5 are unique probes of the growth of supermassive black holes\, and a nuisance in the direct measurements of the mean free path of the photons that reionize the universe.  Interestingly\, such proximity zones have been at the centre of two observational puzzles in recent times: 1) about 10% of the measured proximity zone sizes in the quasar Lyman-alpha spectra seem to be too short to explain their black hole masses\, and 2) when corrected for the proximity zones\, the mean free path of ionizing photons at z ~ 6 appears to be much shorter than theoretical predictions.  In this talk\, I will present a model of quasar proximity zones that takes into account the patchiness of the ionization and thermal state of the IGM during reionization.  I will show that the patchiness of reionization can relieve the tension between the proximity zone sizes and black hole masses to some degree\, but not fully.  Further\, I will show how quasar proximity zones in an inhomogeneously ionized IGM affects mean free path measurements from rest-frame 912 A spectra at z ~ 6.  By forward modelling the proximity zones\, I will examine the consistency between the direct and indirect redshift-6 mean free path measurements.  Finally\, I will show that the observed distribution of proximity zone sizes can be explained by a model in which quasars are variable on timescales of ~10^6 yr and have short duty cycles. This conclusion\, when combined with the measurements of black hole masses of these quasars\, directly leads to a prediction of significant obscuration in high-redshift quasars. I will argue that measurements of this obscuration fraction using JWST can then place constraints on the seed mass and formation redshifts of black holes. \nJoin Zoom Meeting\nhttps://lbnl.zoom.us/j/95016696011?pwd=Tk1XOW1Xd3RYRnlsc2tEYmRWZlVVZz09 \nMeeting ID: 950 1669 6011\n\nPasscode: 247722
URL:https://inpa.lbl.gov/event/special-inpa-speaker-sindhu-satyavolu-ifae-institut-de-fisica-daltes-energies/
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BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20241206T120000
DTEND;TZID=America/Los_Angeles:20241206T130000
DTSTAMP:20260425T163501
CREATED:20241202T191754Z
LAST-MODIFIED:20241202T191805Z
UID:1882-1733486400-1733490000@inpa.lbl.gov
SUMMARY:INPA Seminar- Speaker:  Alina Sabyr (Columbia University)
DESCRIPTION:INPA Seminar Talk\nDate:  December 6\, 2024\nTime: 12:00 pm – 1:00 pm\n\n\nLocation: Sessler Conference Room – 50A-5132 [Hybrid and In-Person]\nSpeaker: Alina Sabyr (Columbia University)\nTitle: Future Cosmology with CMB Spectral Distortions and Secondaries\nAbstract: Spectral distortions–small deviations of the cosmic microwave background (CMB) energy spectrum from that of a perfect blackbody–probe the physical processes that occur in the primordial Universe (\mu-distortion) and at late times (y-distortion). In this talk\, I will present a new instrument concept\, SPECTER\, that we forecast to observe the \mu-distortion at high significance while marginalizing over astrophysical foregrounds. Within the standard cosmological model\, the \mu-distortion is sourced primarily by the energy injected via Silk damping and is thus sensitive to the primordial power spectrum at very small scales. Next\, I will present a new constraint on the y-distortion from the re-analysis of the COBE/FIRAS archival data. The known source of the y-distortion is the thermal Sunyaev-Zeldovich (tSZ) effect – inverse-Compton scattering of CMB photons off of energetic electrons primarily located in galaxy groups and clusters. Therefore\, y-distortion can give tight constraints on the mean ionized gas properties. Finally\, upcoming CMB anisotropy experiments will provide high-resolution and low-noise component-separated tSZ maps. I will discuss the cosmological constraining power of several tSZ higher-order statistics. Using a large suite of halo-model-based simulations\, we show that there is substantial non-Gaussian information in the tSZ maps that can be extracted in future analyses. \n\nJoin Zoom Meeting\nhttps://lbnl.zoom.us/j/95016696011?pwd=Tk1XOW1Xd3RYRnlsc2tEYmRWZlVVZz09 \nMeeting ID: 950 1669 6011\n\nPasscode: 247722
URL:https://inpa.lbl.gov/event/inpa-seminar-speaker-alina-sabyr-columbia-university/
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20241213T120000
DTEND;TZID=America/Los_Angeles:20241213T130000
DTSTAMP:20260425T163501
CREATED:20241210T200443Z
LAST-MODIFIED:20241210T200443Z
UID:1893-1734091200-1734094800@inpa.lbl.gov
SUMMARY:NO INPA SEMINAR
DESCRIPTION:
URL:https://inpa.lbl.gov/event/no-inpa-seminar-25/
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20241220T120000
DTEND;TZID=America/Los_Angeles:20241220T130000
DTSTAMP:20260425T163501
CREATED:20241210T200658Z
LAST-MODIFIED:20241212T214507Z
UID:1895-1734696000-1734699600@inpa.lbl.gov
SUMMARY:INPA SEMINAR Speaker: Majd Ghrear (UHM)- Title: Directional Recoil Detection
DESCRIPTION:Date: December 20\, 2024 \nTime: 12:00 am – 1:00 pm \nLocation: Sessler Conference Room – 50A-5132 [Hybrid and In-Person] \nSpeaker: Majd Ghrear (UHM) \nTitle: Directional Recoil Detection \nAbstract: Directional detection of low-energy nuclear and electronic recoils is broadly desirable in nuclear and particle physics. Applications include coherent elastic neutrino-nucleus scattering (CEνNS)\, astrophysical neutrino measurements\, probing dark matter (DM) beneath the neutrino fog\, and possibly confirming the galactic origin of a DM signal. While gaseous Time Projection Chambers (TPCs) offer the required gain and readout granularity\, they must be very large to achieve the required sensitivity for several of these physics applications. We discuss several aspects of future directional recoil detection experiments such as background rejection\, detector scalability\, directional performance on electron recoils\, and improving directional performance with deep neural networks. \nJoin Zoom Meeting\nhttps://lbnl.zoom.us/j/95016696011?pwd=Tk1XOW1Xd3RYRnlsc2tEYmRWZlVVZz09 \nMeeting ID: 950 1669 6011\n\nPasscode: 247722
URL:https://inpa.lbl.gov/event/no-inpa-seminar-26/
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