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  "authors": [
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      "raw_name": "Heliudson Bernardo", 
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        {
          "country": "Canada", 
          "value": "Department of Physics, McGill University, Montr\u00e9al, Quebec H3A 2T8, Canada"
        }
      ], 
      "surname": "Bernardo", 
      "given_names": "Heliudson", 
      "full_name": "Bernardo, Heliudson"
    }, 
    {
      "raw_name": "Suddhasattwa Brahma", 
      "affiliations": [
        {
          "country": "Canada", 
          "value": "Department of Physics, McGill University, Montr\u00e9al, Quebec H3A 2T8, Canada"
        }
      ], 
      "surname": "Brahma", 
      "given_names": "Suddhasattwa", 
      "full_name": "Brahma, Suddhasattwa"
    }, 
    {
      "raw_name": "Keshav Dasgupta", 
      "affiliations": [
        {
          "country": "Canada", 
          "value": "Department of Physics, McGill University, Montr\u00e9al, Quebec H3A 2T8, Canada"
        }
      ], 
      "surname": "Dasgupta", 
      "given_names": "Keshav", 
      "full_name": "Dasgupta, Keshav"
    }, 
    {
      "raw_name": "Mir Mehedi Faruk", 
      "affiliations": [
        {
          "country": "Canada", 
          "value": "Department of Physics, McGill University, Montr\u00e9al, Quebec H3A 2T8, Canada"
        }
      ], 
      "surname": "Faruk", 
      "given_names": "Mir Mehedi", 
      "full_name": "Faruk, Mir Mehedi"
    }, 
    {
      "raw_name": "Radu Tatar", 
      "affiliations": [
        {
          "country": "UK", 
          "value": "Department of Mathematical Sciences, University of Liverpool, Liverpool, L69 7ZL, United Kingdom"
        }
      ], 
      "surname": "Tatar", 
      "given_names": "Radu", 
      "full_name": "Tatar, Radu"
    }
  ], 
  "titles": [
    {
      "source": "APS", 
      "title": "Four-Dimensional Null Energy Condition as a Swampland Conjecture"
    }
  ], 
  "dois": [
    {
      "value": "10.1103/PhysRevLett.127.181301"
    }
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  "publication_info": [
    {
      "journal_volume": "127", 
      "journal_title": "Physical Review Letters", 
      "material": "article", 
      "journal_issue": "18", 
      "year": 2021
    }
  ], 
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    "submission_number": "a0d20d20b4c111ec837fd6d834be26e1"
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  "page_nr": [
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      "url": "https://creativecommons.org/licenses/by/4.0/", 
      "license": "CC-BY-4.0"
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  "copyright": [
    {
      "statement": "Published by the American Physical Society", 
      "year": "2021"
    }
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  "control_number": "65630", 
  "record_creation_date": "2021-10-27T16:30:08.706604", 
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      "categories": [
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      "value": "2107.06900"
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  "abstracts": [
    {
      "source": "APS", 
      "value": "We analyze four-dimensional Friedmann-Lema\u00eetre-Robertson-Walker cosmologies in type IIB, arising from a M-theory dual, and find that the null energy condition (NEC) has to be obeyed by them (except for the negatively curved case) in order for the M-theory action to have a Wilsonian effective description. However, this does not imply that the M-theory metric has to obey the 11D NEC. Thus, we propose a new swampland conjecture\u2014the 4D NEC is a consistency condition for any theory to have a completion within M theory\u2014with an explicit derivation of it for cosmological backgrounds from a top-down perspective. We briefly discuss the cosmological consequences of such a condition derived from M theory."
    }
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