A precise symbolic emulator of the linear matter power spectrum

Astronomy and Astrophysics EDP Sciences 686 (2024) a209

Authors:

Deaglan J Bartlett, Lukas Kammerer, Gabriel Kronberger, Harry Desmond, Pedro G Ferreira, Benjamin D Wandelt, Bogdan Burlacu, David Alonso, Matteo Zennaro

Abstract:

Context. Computing the matter power spectrum, P(k), as a function of cosmological parameters can be prohibitively slow in cosmological analyses, hence emulating this calculation is desirable. Previous analytic approximations are insufficiently accurate for modern applications, so black-box, uninterpretable emulators are often used.

Aims. We aim to construct an efficient, differentiable, interpretable, symbolic emulator for the redshift zero linear matter power spectrum which achieves sub-percent level accuracy. We also wish to obtain a simple analytic expression to convert As to σ8 given the other cosmological parameters.

Methods. We utilise an efficient genetic programming based symbolic regression framework to explore the space of potential mathematical expressions which can approximate the power spectrum and σ8. We learn the ratio between an existing low-accuracy fitting function for P(k) and that obtained by solving the Boltzmann equations and thus still incorporate the physics which motivated this earlier approximation.

Results. We obtain an analytic approximation to the linear power spectrum with a root mean squared fractional error of 0.2% between k = 9 × 10−3 − 9 h Mpc−1 and across a wide range of cosmological parameters, and we provide physical interpretations for various terms in the expression. Our analytic approximation is 950 times faster to evaluate than CAMB and 36 times faster than the neural network based matter power spectrum emulator BACCO. We also provide a simple analytic approximation for σ8 with a similar accuracy, with a root mean squared fractional error of just 0.1% when evaluated across the same range of cosmologies. This function is easily invertible to obtain As as a function of σ8 and the other cosmological parameters, if preferred.

Conclusions. It is possible to obtain symbolic approximations to a seemingly complex function at a precision required for current and future cosmological analyses without resorting to deep-learning techniques, thus avoiding their black-box nature and large number of parameters. Our emulator will be usable long after the codes on which numerical approximations are built become outdated.

Beam-induced backgrounds measured in the ATLAS detector during local gas injection into the LHC beam vacuum

Journal of Instrumentation IOP Publishing 19:06 (2024) P06014

Authors:

G Aad, E Aakvaag, B Abbott, S Abdelhameed, K Abeling, NJ Abicht, SH Abidi, M Aboelela, A Aboulhorma, H Abramowicz, H Abreu, Y Abulaiti, BS Acharya, A Ackermann, C Adam Bourdarios, L Adamczyk, SV Addepalli, MJ Addison, J Adelman, A Adiguzel, M Ady, T Adye, AA Affolder, Y Afik

Abstract:

Inelastic beam-gas collisions at the Large Hadron Collider (LHC), within a few hundred metres of the ATLAS experiment, are known to give the dominant contribution to beam backgrounds. These are monitored by ATLAS with a dedicated Beam Conditions Monitor (BCM) and with the rate of fake jets in the calorimeters. These two methods are complementary since the BCM probes backgrounds just around the beam pipe while fake jets are observed at radii of up to several metres. In order to quantify the correlation between the residual gas density in the LHC beam vacuum and the experimental backgrounds recorded by ATLAS, several dedicated tests were performed during LHC Run 2. Local pressure bumps, with a gas density several orders of magnitude higher than during normal operation, were introduced at different locations. The changes of beam-related backgrounds, seen in ATLAS, are correlated with the local pressure variation. In addition the rates of beam-gas events are estimated from the pressure measurements and pressure bump profiles obtained from calculations. Using these rates, the efficiency of the ATLAS beam background monitors to detect beam-gas events is derived as a function of distance from the interaction point. These efficiencies and characteristic distributions of fake jets from the beam backgrounds are found to be in good agreement with results of beam-gas simulations performed with the Fluka Monte Carlo programme.

Assessment of Gradient-Based Samplers in Standard Cosmological Likelihoods

(2024)

Authors:

Arrykrishna Mootoovaloo, Jaime Ruiz-Zapatero, Carlos García-García, David Alonso

Combination of Searches for Resonant Higgs Boson Pair Production Using pp Collisions at s=13 TeV with the ATLAS Detector

Physical Review Letters American Physical Society (APS) 132:23 (2024) 231801

Authors:

G Aad, E Aakvaag, B Abbott, K Abeling, NJ Abicht, SH Abidi, A Aboulhorma, H Abramowicz, H Abreu, Y Abulaiti, BS Acharya, C Adam Bourdarios, L Adamczyk, SV Addepalli, MJ Addison, J Adelman, A Adiguzel, T Adye, AA Affolder, Y Afik, MN Agaras, J Agarwala, A Aggarwal, C Agheorghiesei, A Ahmad, F Ahmadov, WS Ahmed, S Ahuja, X Ai, G Aielli, A Aikot, M Ait Tamlihat, B Aitbenchikh, I Aizenberg, M Akbiyik, TPA Åkesson, AV Akimov, D Akiyama, NN Akolkar, S Aktas, K Al Khoury, GL Alberghi, J Albert, P Albicocco, GL Albouy, S Alderweireldt, ZL Alegria, M Aleksa, IN Aleksandrov, C Alexa, T Alexopoulos, F Alfonsi, M Algren, M Alhroob, B Ali, HMJ Ali, S Ali, SW Alibocus, M Aliev, G Alimonti, W Alkakhi, C Allaire, BMM Allbrooke, JF Allen, CA Allendes Flores, PP Allport, A Aloisio, F Alonso, C Alpigiani, M Alvarez Estevez, A Alvarez Fernandez, M Alves Cardoso, MG Alviggi, M Aly, Y Amaral Coutinho, A Ambler, C Amelung, M Amerl, CG Ames, D Amidei, KJ Amirie, SP Amor Dos Santos, KR Amos, V Ananiev, C Anastopoulos, T Andeen, JK Anders, SY Andrean, A Andreazza, S Angelidakis, A Angerami, AV Anisenkov, A Annovi, C Antel, MT Anthony, E Antipov, M Antonelli, F Anulli, M Aoki, T Aoki, JA Aparisi Pozo, MA Aparo, L Aperio Bella, C Appelt, A Apyan, SJ Arbiol Val, C Arcangeletti, ATH Arce, E Arena, J-F Arguin, S Argyropoulos, J-H Arling, O Arnaez, H Arnold, G Artoni, H Asada, K Asai, S Asai, NA Asbah, K Assamagan, R Astalos, S Atashi, RJ Atkin, M Atkinson, H Atmani, PA Atmasiddha, K Augsten, S Auricchio, AD Auriol, VA Austrup, G Avolio, K Axiotis, G Azuelos, D Babal, H Bachacou, K Bachas, A Bachiu, F Backman, A Badea, TM Baer, P Bagnaia, M Bahmani, D Bahner, K Bai, AJ Bailey, VR Bailey, JT Baines, L Baines, OK Baker, E Bakos, D Bakshi Gupta, V Balakrishnan, R Balasubramanian, EM Baldin, P Balek, E Ballabene, F Balli, LM Baltes, WK Balunas, J Balz, E Banas, M Bandieramonte, A Bandyopadhyay, S Bansal, L Barak, M Barakat, EL Barberio, D Barberis, M Barbero, MZ Barel, KN Barends, T Barillari, M-S Barisits, T Barklow, P Baron, DA Baron Moreno, A Baroncelli, G Barone, AJ Barr, JD Barr, F Barreiro, J Barreiro Guimarães da Costa, U Barron, MG Barros Teixeira, S Barsov, F Bartels, R Bartoldus, AE Barton, P Bartos, A Basan, M Baselga, A Bassalat, MJ Basso, CR Basson, RL Bates, S Batlamous, B Batool, M Battaglia, D Battulga, M Bauce, M Bauer, P Bauer, LT Bazzano Hurrell, JB Beacham, T Beau, JY Beaucamp, PH Beauchemin, P Bechtle, HP Beck, K Becker, AJ Beddall, VA Bednyakov, CP Bee, LJ Beemster, TA Beermann, M Begalli, M Begel, A Behera, JK Behr, JF Beirer, F Beisiegel, M Belfkir, G Bella, L Bellagamba, A Bellerive, P Bellos, K Beloborodov, D Benchekroun, F Bendebba, Y Benhammou, KC Benkendorfer, L Beresford, M Beretta, E Bergeaas Kuutmann, N Berger, B Bergmann, J Beringer, G Bernardi, C Bernius, FU Bernlochner, F Bernon, A Berrocal Guardia, T Berry, P Berta, A Berthold, S Bethke, A Betti, AJ Bevan, NK Bhalla, M Bhamjee, S Bhatta, DS Bhattacharya, P Bhattarai, KD Bhide, VS Bhopatkar, RM Bianchi, G Bianco, O Biebel, R Bielski, M Biglietti, CS Billingsley, M Bindi, A Bingul, C Bini, A Biondini, CJ Birch-sykes, GA Bird, M Birman, M Biros, S Biryukov, T Bisanz, E Bisceglie, JP Biswal, D Biswas, K Bjørke, I Bloch, A Blue, U Blumenschein, J Blumenthal, VS Bobrovnikov, M Boehler, B Boehm, D Bogavac, AG Bogdanchikov, C Bohm, V Boisvert, P Bokan, T Bold, M Bomben, M Bona, M Boonekamp, CD Booth, AG Borbély, IS Bordulev, HM Borecka-Bielska, G Borissov, D Bortoletto, D Boscherini, M Bosman, JD Bossio Sola, K Bouaouda, N Bouchhar, J Boudreau, EV Bouhova-Thacker, D Boumediene, R Bouquet, A Boveia, J Boyd, D Boye, IR Boyko, J Bracinik, N Brahimi, G Brandt, O Brandt, F Braren, B Brau, JE Brau, R Brener, L Brenner, R Brenner, S Bressler, D Britton, D Britzger, I Brock, G Brooijmans, E Brost, LM Brown, LE Bruce, TL Bruckler, PA Bruckman de Renstrom, B Brüers, A Bruni, G Bruni, M Bruschi, N Bruscino, T Buanes, Q Buat, D Buchin, AG Buckley, O Bulekov, BA Bullard, S Burdin, CD Burgard, AM Burger, B Burghgrave, O Burlayenko, JTP Burr, CD Burton, JC Burzynski, EL Busch, V Büscher, PJ Bussey, JM Butler, CM Buttar, JM Butterworth, W Buttinger, CJ Buxo Vazquez, AR Buzykaev, S Cabrera Urbán, L Cadamuro, D Caforio, H Cai, Y Cai, Y Cai, VMM Cairo, O Cakir, N Calace, P Calafiura, G Calderini, P Calfayan, G Callea, LP Caloba, D Calvet, S Calvet, M Calvetti, R Camacho Toro, S Camarda, D Camarero Munoz, P Camarri, MT Camerlingo, D Cameron, C Camincher, M Campanelli, A Camplani, V Canale, AC Canbay, J Cantero, Y Cao, F Capocasa, M Capua, A Carbone, R Cardarelli, JCJ Cardenas, F Cardillo, G Carducci, T Carli, G Carlino, JI Carlotto, BT Carlson, EM Carlson, L Carminati, A Carnelli, M Carnesale, S Caron, E Carquin, S Carrá, G Carratta, AM Carroll, TM Carter, MP Casado, M Caspar, FL Castillo, L Castillo Garcia, V Castillo Gimenez, NF Castro, A Catinaccio, JR Catmore, T Cavaliere, V Cavaliere, N Cavalli, YC Cekmecelioglu, E Celebi, F Celli, MS Centonze, V Cepaitis, K Cerny, AS Cerqueira, A Cerri, L Cerrito, F Cerutti, B Cervato, A Cervelli, G Cesarini, SA Cetin, D Chakraborty, J Chan, WY Chan, JD Chapman, E Chapon, B Chargeishvili, DG Charlton, M Chatterjee, C Chauhan, Y Che, S Chekanov, SV Chekulaev, GA Chelkov, A Chen, B Chen, B Chen, H Chen, H Chen, J Chen, J Chen, M Chen, S Chen, SJ Chen, X Chen, X Chen, Y Chen, CL Cheng, HC Cheng, S Cheong, A Cheplakov, E Cheremushkina, E Cherepanova, R Cherkaoui El Moursli, E Cheu, K Cheung, L Chevalier, V Chiarella, G Chiarelli, N Chiedde, G Chiodini, AS Chisholm, A Chitan, M Chitishvili, MV Chizhov, K Choi, Y Chou, EYS Chow, KL Chu, MC Chu, X Chu, J Chudoba, JJ Chwastowski, D Cieri, KM Ciesla, V Cindro, A Ciocio, F Cirotto, ZH Citron, M Citterio, DA Ciubotaru, A Clark, PJ Clark, C Clarry, JM Clavijo Columbie, SE Clawson, C Clement, J Clercx, Y Coadou, M Cobal, A Coccaro, RF Coelho Barrue, R Coelho Lopes De, S Coelli, B Cole, J Collot, P Conde Muiño, MP Connell, SH Connell, EI Conroy, F Conventi, HG Cooke, AM Cooper-Sarkar, A Cordeiro Oudot Choi, LD Corpe, M Corradi, F Corriveau, A Cortes-Gonzalez, MJ Costa, F Costanza, D Costanzo, BM Cote, G Cowan, K Cranmer, D Cremonini, S Crépé-Renaudin, F Crescioli, M Cristinziani, M Cristoforetti, V Croft, JE Crosby, G Crosetti, A Cueto, T Cuhadar Donszelmann, H Cui, Z Cui, WR Cunningham, F Curcio, P Czodrowski, MM Czurylo, MJ Da Cunha Sargedas De Sousa, JV Da Fonseca Pinto, C Da Via, W Dabrowski, T Dado, S Dahbi, T Dai, D Dal Santo, C Dallapiccola, M Dam, G D’amen, V D’Amico, J Damp, JR Dandoy, M Danninger, V Dao, G Darbo, S Darmora, SJ Das, S D’Auria, A D’avanzo, C David, T Davidek, B Davis-Purcell, I Dawson, HA Day-hall, K De, R De Asmundis, N De Biase, S De Castro, N De Groot, P de Jong, H De la Torre, A De Maria, A De Salvo, U De Sanctis, F De Santis, A De Santo, JB De Vivie De Regie, DV Dedovich, J Degens, AM Deiana, F Del Corso, J Del Peso, F Del Rio, L Delagrange, F Deliot, CM Delitzsch, M Della Pietra, D Della Volpe, A Dell’Acqua, L Dell’Asta, M Delmastro, PA Delsart, S Demers, M Demichev, SP Denisov, L D’Eramo, D Derendarz, F Derue, P Dervan, K Desch, C Deutsch, FA Di Bello, A Di Ciaccio, L Di Ciaccio, A Di Domenico, C Di Donato, A Di Girolamo, G Di Gregorio, A Di Luca, B Di Micco, R Di Nardo, M Diamantopoulou, FA Dias, T Dias Do Vale, MA Diaz, FG Diaz Capriles, M Didenko, EB Diehl, S Díez Cornell, C Diez Pardos, C Dimitriadi, A Dimitrievska, J Dingfelder, I-M Dinu, SJ Dittmeier, F Dittus, F Djama, T Djobava, C Doglioni, A Dohnalova, J Dolejsi, Z Dolezal, KM Dona, M Donadelli, B Dong, J Donini, A D’Onofrio, M D’Onofrio, J Dopke, A Doria, N Dos Santos Fernandes, P Dougan, MT Dova, AT Doyle, MA Draguet, E Dreyer, I Drivas-koulouris, M Drnevich, M Drozdova, D Du, TA du Pree, F Dubinin, M Dubovsky, E Duchovni, G Duckeck, OA Ducu, D Duda, A Dudarev, ER Duden, M D’uffizi, L Duflot, M Dührssen, AE Dumitriu, M Dunford, S Dungs, K Dunne, A Duperrin, H Duran Yildiz, M Düren, A Durglishvili, BL Dwyer, GI Dyckes, M Dyndal, BS Dziedzic, ZO Earnshaw, GH Eberwein, B Eckerova, S Eggebrecht, E Egidio Purcino De Souza, LF Ehrke, G Eigen, K Einsweiler, T Ekelof, PA Ekman, S El Farkh, Y El Ghazali, H El Jarrari, A El Moussaouy, V Ellajosyula, M Ellert, F Ellinghaus, N Ellis, J Elmsheuser, M Elsing, D Emeliyanov, Y Enari, I Ene, S Epari, PA Erland, M Errenst, M Escalier, C Escobar, E Etzion, G Evans, H Evans, LS Evans, A Ezhilov, S Ezzarqtouni, F Fabbri, L Fabbri, G Facini, V Fadeyev, RM Fakhrutdinov, D Fakoudis, S Falciano, LF Falda Ulhoa Coelho, PJ Falke, J Faltova, C Fan, Y Fan, Y Fang, M Fanti, M Faraj, Z Farazpay, A Farbin, A Farilla, T Farooque, SM Farrington, F Fassi, D Fassouliotis, M Faucci Giannelli, WJ Fawcett, L Fayard, P Federic, P Federicova, OL Fedin, M Feickert, L Feligioni, DE Fellers, C Feng, M Feng, Z Feng, MJ Fenton, L Ferencz, RAM Ferguson, SI Fernandez Luengo, P Fernandez Martinez, MJV Fernoux, J Ferrando, A Ferrari, P Ferrari, R Ferrari, D Ferrere, C Ferretti, F Fiedler, P Fiedler, A Filipčič, EK Filmer, F Filthaut, MCN Fiolhais, L Fiorini, WC Fisher, T Fitschen, PM Fitzhugh, I Fleck, P Fleischmann, T Flick, M Flores, LR Flores Castillo, L Flores Sanz De Acedo, FM Follega, N Fomin, JH Foo, A Formica, AC Forti, E Fortin, AW Fortman, MG Foti, L Fountas, D Fournier, H Fox, P Francavilla, S Francescato, S Franchellucci, M Franchini, S Franchino, D Francis, L Franco, V Franco Lima, L Franconi, M Franklin, G Frattari, WS Freund, YY Frid, J Friend, N Fritzsche, A Froch, D Froidevaux, JA Frost, Y Fu, S Fuenzalida Garrido, M Fujimoto, KY Fung, E Furtado De Simas Filho, M Furukawa, J Fuster, A Gabrielli, A Gabrielli, P Gadow, G Gagliardi, LG Gagnon, S Galantzan, EJ Gallas, BJ Gallop, KK Gan, S Ganguly, Y Gao, FM Garay Walls, B Garcia, C García, A Garcia Alonso, AG Garcia Caffaro, JE García Navarro, M Garcia-Sciveres, GL Gardner, RW Gardner, N Garelli, D Garg, RB Garg, JM Gargan, CA Garner, CM Garvey, P Gaspar, VK Gassmann, G Gaudio, V Gautam, P Gauzzi, IL Gavrilenko, A Gavrilyuk, C Gay, G Gaycken, EN Gazis, AA Geanta, CM Gee, A Gekow, C Gemme, MH Genest, AD Gentry, S George, WF George, T Geralis, P Gessinger-Befurt, ME Geyik, M Ghani, M Ghneimat, K Ghorbanian, A Ghosal, A Ghosh, A Ghosh, B Giacobbe, S Giagu, T Giani, P Giannetti, A Giannini, SM Gibson, M Gignac, DT Gil, AK Gilbert, BJ Gilbert, D Gillberg, G Gilles, L Ginabat, DM Gingrich, MP Giordani, PF Giraud, G Giugliarelli, D Giugni, F Giuli, I Gkialas, LK Gladilin, C Glasman, GR Gledhill, G Glemža, M Glisic, I Gnesi, Y Go, M Goblirsch-Kolb, B Gocke, D Godin, B Gokturk, S Goldfarb, T Golling, MGD Gololo, D Golubkov, JP Gombas, A Gomes, G Gomes Da Silva, AJ Gomez Delegido, R Gonçalo, L Gonella, A Gongadze, F Gonnella, JL Gonski, RY González Andana, S González de la Hoz, R Gonzalez Lopez, C Gonzalez Renteria, MV Gonzalez Rodrigues, R Gonzalez Suarez, S Gonzalez-Sevilla, GR Gonzalvo Rodriguez, L Goossens, B Gorini, E Gorini, A Gorišek, TC Gosart, AT Goshaw, MI Gostkin, S Goswami, CA Gottardo, SA Gotz, M Gouighri, V Goumarre, AG Goussiou, N Govender, I Grabowska-Bold, K Graham, E Gramstad, S Grancagnolo, CM Grant, PM Gravila, FG Gravili, HM Gray, M Greco, C Grefe, IM Gregor, P Grenier, SG Grewe, AA Grillo, K Grimm, S Grinstein, J-F Grivaz, E Gross, J Grosse-Knetter, JC Grundy, L Guan, C Gubbels, JGR Guerrero Rojas, G Guerrieri, F Guescini, R Gugel, JAM Guhit, A Guida, E Guilloton, S Guindon, F Guo, J Guo, L Guo, Y Guo, R Gupta, R Gupta, S Gurbuz, SS Gurdasani, G Gustavino, M Guth, P Gutierrez, LF Gutierrez Zagazeta, M Gutsche, C Gutschow, C Gwenlan, CB Gwilliam, ES Haaland, A Haas, M Habedank, C Haber, HK Hadavand, A Hadef, S Hadzic, AI Hagan, JJ Hahn, EH Haines, M Haleem, J Haley, JJ Hall, GD Hallewell, L Halser, K Hamano, M Hamer, GN Hamity, EJ Hampshire, J Han, K Han, L Han, L Han, S Han, YF Han, K Hanagaki, M Hance, DA Hangal, H Hanif, MD Hank, JB Hansen, PH Hansen, K Hara, D Harada, T Harenberg, S Harkusha, ML Harris, YT Harris, J Harrison, NM Harrison, PF Harrison, NM Hartman, NM Hartmann, Y Hasegawa, R Hauser, CM Hawkes, RJ Hawkings, Y Hayashi, S Hayashida, D Hayden, C Hayes, RL Hayes, CP Hays, JM Hays, HS Hayward, F He, M He, Y He, Y He, Y He, NB Heatley, V Hedberg, AL Heggelund, ND Hehir, C Heidegger, KK Heidegger, WD Heidorn, J Heilman, S Heim, T Heim, JG Heinlein, JJ Heinrich, L Heinrich, J Hejbal, A Held, S Hellesund, CM Helling, S Hellman, RCW Henderson, L Henkelmann, AM Henriques Correia, H Herde, Y Hernández Jiménez, LM Herrmann, T Herrmann, G Herten, R Hertenberger, L Hervas, ME Hesping, NP Hessey, E Hill, SJ Hillier, JR Hinds, F Hinterkeuser, M Hirose, S Hirose, D Hirschbuehl, TG Hitchings, B Hiti, J Hobbs, R Hobincu, N Hod, MC Hodgkinson, BH Hodkinson, A Hoecker, DD Hofer, J Hofer, T Holm, M Holzbock, LBAH Hommels, BP Honan, J Hong, TM Hong, BH Hooberman, WH Hopkins, Y Horii, S Hou, AS Howard, J Howarth, J Hoya, M Hrabovsky, A Hrynevich, T Hryn’ova, PJ Hsu, S-C Hsu, Q Hu, S Huang, X Huang, X Huang, Y Huang, Y Huang, Z Huang, Z Hubacek, M Huebner, F Huegging, TB Huffman, CA Hugli, M Huhtinen, SK Huiberts, R Hulsken, N Huseynov, J Huston, J Huth, R Hyneman, G Iacobucci, G Iakovidis, I Ibragimov, L Iconomidou-Fayard, JP Iddon, P Iengo, R Iguchi, T Iizawa, Y Ikegami, N Ilic, H Imam, M Ince Lezki, T Ingebretsen Carlson, G Introzzi, M Iodice, V Ippolito, RK Irwin, M Ishino, W Islam, C Issever, S Istin, H Ito, R Iuppa, A Ivina, JM Izen, V Izzo, P Jacka, P Jackson, BP Jaeger, CS Jagfeld, G Jain, P Jain, K Jakobs, T Jakoubek, J Jamieson, KW Janas, M Javurkova, L Jeanty, J Jejelava, P Jenni, CE Jessiman, C Jia, J Jia, X Jia, X Jia, Z Jia, S Jiggins, J Jimenez Pena, S Jin, A Jinaru, O Jinnouchi, P Johansson, KA Johns, JW Johnson, DM Jones, E Jones, P Jones, RWL Jones, TJ Jones, HL Joos, R Joshi, J Jovicevic, X Ju, JJ Junggeburth, T Junkermann, A Juste Rozas, MK Juzek, S Kabana, A Kaczmarska, M Kado, H Kagan, M Kagan, A Kahn, A Kahn, C Kahra, T Kaji, E Kajomovitz, N Kakati, I Kalaitzidou, CW Kalderon, NJ Kang, D Kar, K Karava, MJ Kareem, E Karentzos, I Karkanias, O Karkout, SN Karpov, ZM Karpova, V Kartvelishvili, AN Karyukhin, E Kasimi, J Katzy, S Kaur, K Kawade, MP Kawale, C Kawamoto, T Kawamoto, EF Kay, FI Kaya, S Kazakos, VF Kazanin, Y Ke, JM Keaveney, R Keeler, GV Kehris, JS Keller, AS Kelly, JJ Kempster, PD Kennedy, O Kepka, BP Kerridge, S Kersten, BP Kerševan, S Keshri, L Keszeghova, S Ketabchi Haghighat, RA Khan, A Khanov, AG Kharlamov, T Kharlamova, EE Khoda, M Kholodenko, TJ Khoo, G Khoriauli, J Khubua, YAR Khwaira, B Kibirige, A Kilgallon, DW Kim, YK Kim, N Kimura, MK Kingston, A Kirchhoff, C Kirfel, F Kirfel, J Kirk, AE Kiryunin, C Kitsaki, O Kivernyk, M Klassen, C Klein, L Klein, MH Klein, SB Klein, U Klein, P Klimek, A Klimentov, T Klioutchnikova, P Kluit, S Kluth, E Kneringer, TM Knight, A Knue, R Kobayashi, D Kobylianskii, SF Koch, M Kocian, P Kodyš, DM Koeck, PT Koenig, T Koffas, O Kolay, I Koletsou, T Komarek, K Köneke, AXY Kong, T Kono, N Konstantinidis, P Kontaxakis, B Konya, R Kopeliansky, 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Zhu, J Zhu, Y Zhu, Y Zhu, X Zhuang, K Zhukov, NI Zimine, J Zinsser, M Ziolkowski, L Živković, A Zoccoli, K Zoch, TG Zorbas, O Zormpa, W Zou, L Zwalinski

Growth history and quasar bias evolution at z < 3 from Quaia

Journal of Cosmology and Astroparticle Physics IOP Publishing 2024:06 (2024) 012

Authors:

Giulia Piccirilli, Giulio Fabbian, David Alonso, Kate Storey-Fisher, Julien Carron, Antony Lewis, Carlos García-García

Abstract:

We make use of the Gaia-unWISE quasar catalogue, Quaia, to constrain the growth history out to high redshifts from the clustering of quasars and their cross-correlation with maps of the Cosmic Microwave Background (CMB) lensing convergence. Considering three tomographic bins, centred at redshifts z̅i = [0.69, 1.59, 2.72], we reconstruct the evolution of the amplitude of matter fluctuations σ 8(z) over the last ∼ 12 billion years of cosmic history. In particular, we make one of the highest-redshift measurements of σ 8 (σ 8(z = 2.72) = 0.22 ± 0.06), finding it to be in good agreement (at the ∼ 1σ level) with the value predicted by ΛCDM using CMB data from Planck. We also used the data to study the evolution of the linear quasar bias for this sample, finding values similar to those of other quasar samples, although with a less steep evolution at high redshifts. Finally, we study the potential impact of foreground contamination in the CMB lensing maps and, although we find evidence of contamination in cross-correlations at z ∼ 1.7 we are not able to clearly pinpoint its origin as being Galactic or extragalactic. Nevertheless, we determine that the impact of this contamination on our results is negligible.