BEGIN:VCALENDAR VERSION:2.0 PRODID:-//linuxsoftware.nz//NONSGML Joyous v1.4//EN BEGIN:VEVENT SUMMARY:Constraining constant and tomographic coupled dark energy with low and high redshift probes DTSTART:20230606T143000Z DTEND:20230606T160000Z DTSTAMP:20260812T194756Z UID:a1a23635-3aa6-4467-b886-a4b7d1b02b86 SEQUENCE:3 CREATED:20230605T110839Z DESCRIPTION:ABSTRACT: We consider coupled dark energy (CDE) cosmologies\, where dark matter particles feel a force stronger than gravity\, due to th e fifth force mediated by a scalar field which plays the role of dark ener gy. We perform for the first time a tomographic analysis of coupled dark e nergy\, where the coupling strength is parametrized and constrained in dif ferent redshift bins. This allows us to verify which data can better const rain the strength of the coupling and how large the coupling can be at dif ferent epochs. First\, we employ cosmic microwave background data from Pla nck\, the Atacama Cosmology Telescope (ACT) and South Pole Telescope (SPT) \, showing the impact of different choices that can be done in combining t hese datasets. Then\, we use a range of low redshift probes to test CDE co smologies\, both for a constant and for a tomographic coupling. In particu lar\, we use for the first time data from weak lensing (the KiDS-1000 surv ey)\, galaxy clustering (BOSS survey)\, and their combination\, including 3x2pt galaxy-galaxy lensing crosscorrelation data. We do not find evidence for nonzero coupling\, either for a constant or tomographic case. A nonze ro coupling is however still in agreement with current data. For CMB and b ackground datasets\, a tomographic coupling allows for β values up to one order of magnitude larger than in previous works\, in particular at z<\ ;1. The use of 3x2pt analysis then becomes important to constrain β at lo w redshifts\, even when coupling is allowed to vary: for 3x2pt we find\, a t 0.5 LAST-MODIFIED:20230605T134205Z LOCATION:Sala de Formação Avançada do DF (Sala 2-8.11 - 2º Piso do Pav ilhão de Física) URL:http://df.vps.tecnico.ulisboa.pt/pt/eventos/constraining-constant-and- tomographic-coupled-dark-energy-with-low-and-high-redshift-probes/ X-ALT-DESC;FMTTYPE=text/html:

ABSTRACT: We consid er coupled dark energy (CDE) cosmologies\, where dark matter particles fee l a force stronger than gravity\, due to the fifth force mediated by a sca lar field which plays the role of dark energy. We perform for the first ti me a tomographic analysis of coupled dark energy\, where the coupling stre ngth is parametrized and constrained in different redshift bins. This allo ws us to verify which data can better constrain the strength of the coupli ng and how large the coupling can be at different epochs.

First\ , we employ cosmic microwave background data from Planck\, the Atacama Cos mology Telescope (ACT) and South Pole Telescope (SPT)\, showing the impact of different choices that can be done in combining these datasets. Then\, we use a range of low redshift probes to test CDE cosmologies\, both for a constant and for a tomographic coupling.

In particular\, we us e for the first time data from weak lensing (the KiDS-1000 survey)\, galax y clustering (BOSS survey)\, and their combination\, including 3x2pt galax y-galaxy lensing crosscorrelation data. We do not find evidence for nonzer o coupling\, either for a constant or tomographic case. A nonzero coupling is however still in agreement with current data.

For CMB and ba ckground datasets\, a tomographic coupling allows for β values up to one order of magnitude larger than in previous works\, in particular at z<\; 1. The use of 3x2pt analysis then becomes important to constrain β at low redshifts\, even when coupling is allowed to vary: for 3x2pt we find\, at 0.5

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